John, can't comment on whether that contactor is correct for your application. This is the contactor thst came with my 10KW setup. Perhaps you could cross reference it.
I'd like to put a contactor or solid state relay between my battery and motor so that I can use a simple toggle switch to turn on/off the battery.? ?Longer term, the bms could disable the battery, or I could even select between battery banks.
But for now, starting simple with an electrically controlled switch for the battery.
I'm using a 48V system. Typical max operating current may be as low as 20A, but could get spikes up to 50A.
I've looked at DC solid state relays.? And even found some rated up to 48V.? The problem is that when you read the fine print and reviews - even the 100A? SSR's are not rated for anywhere near that amount of current for constant usage.? ?(arrrgh!!)
I then started looking at "contactors", and eventually ended up looking at 48V golf cart solenoids. I've always thought of a "solenoid" in this case as being a really big relay.? It looks like the 48V golf cart solenoids should work for this application:
(Note - I'm on fresh water, and the solenoid would be in a plastic case - so I'm not worried about corrosion.)
Is that what I'm looking for, or do I need something that's more "heavy duty"? I saw references to using a flyback diode on the control contacts - and that seemed like a good idea.? Anything else I need to know?
Thanks! John
|
I'd like to put a contactor or solid state relay between my battery and motor so that I can use a simple toggle switch to turn on/off the battery.? ?Longer term, the bms could disable the battery, or I could even select between battery banks.
But for now, starting simple with an electrically controlled switch for the battery.
I'm using a 48V system. Typical max operating current may be as low as 20A, but could get spikes up to 50A.
I've looked at DC solid state relays.? And even found some rated up to 48V.? The problem is that when you read the fine print and reviews - even the 100A? SSR's are not rated for anywhere near that amount of current for constant usage.? ?(arrrgh!!)
I then started looking at "contactors", and eventually ended up looking at 48V golf cart solenoids. I've always thought of a "solenoid" in this case as being a really big relay.? It looks like the 48V golf cart solenoids should work for this application:
(Note - I'm on fresh water, and the solenoid would be in a plastic case - so I'm not worried about corrosion.)
Is that what I'm looking for, or do I need something that's more "heavy duty"? I saw references to using a flyback diode on the control contacts - and that seemed like a good idea.? Anything else I need to know?
Thanks! John
|
My gear reduction was a CBN 3201-S-B3- 1.8. Cost was $745.00.
Matthew, I bought mine from an industrial motor supplier. Browning is a world wide motor company. Baldor is another major player in industrial motors. If Baldor is readially available in Australia ask the vendor to cross reference the part number.
+1 for the Browning gear box.? I'm using a CbN-3201-SB3-2.5 with the NEMA spec C-face adapter, my Motenergy PMAC motor bolted right up to it.? The Browning gear boxes are industrial grade with service levels of 10,000 hours before changing the factory oil.? They are figuratively, and maybe literally, bulletproof.? They are relatively inexpensive, small, light, quiet, and efficient.? These gear boxes are available for various power levels and in a variety of different gear ratios, My box ratio is 2.55-1.? You can see a pic in the "Eric's Serenity" photo album in this group.??/g/electricboats/album?id=190248?
Fair winds,
Eric
|
Re: Time to re-power >> How many cells??
Hi John
I run 15 cells without a problem Cheers
Mich
Silly question...? ?Though I hope to get several answers!
Why 16 cells?
These are 3.2V nominal cells, right? They charge up to 3.65V, and can discharge down to 2.2V?? ? So, to give plenty of margin, maybe run between 2.75V for a low, and max of 3.5V?
For 15 cells, that gives:? 41.25 to 52.5. For 16 cells, that would be:? 44 to 56V
It would seem like the 15 cells hits the 48V range easily enough. Are people rounding up to 16 cells just so that they have an even number to work with?? As one example, the Torqeedo 4R has a lower limit cutoff (assuming Li and not lead) of 42V (lead setup is 36V) - so a 15 cell configuration would work reasonably.
Just curious what the thoughts were here.
Thanks, John
On Wednesday, June 3, 2020, 12:13:25 PM CDT, L Schmitz via <terminalift= [email protected]> wrote:
Hello Fred,? The 48 v? 90 ah pack is pretty easy to assemble. That will be 16 cylinders.? You can fit them in 1 West Marine heavy duty battery box.? Weight will be about 85 lbs.? ?Just assemble bus bars to place in series. Then add a bms? and charger. I will check costs on these and forward to you. thank you? kind regards Larry Schmitz
?Terminalift LLC 9444 Mission Park Place Santee, CA 92071 Ph: (619) 562-0355 F: (619) 562-2060
On Tuesday, June 2, 2020, 05:27:23 PM PDT, fred jelich < freddyj408@...> wrote:
I'd be interested in 48v? 90ah for my boat! Hello Steve,? sorry for the delay.? ?I can sell you some of my extra cells.? 3.2 v 90 ah? I am happy with my 10 kw? 48v thunderstruck project? We are experimenting with cylinders and prisms for my work projects.? I can assemble and charge (cost only for a bms and bus bars.)? We are adding a phase change material to our boxes to minimize possible heat and waterproof my battery packs. It is a simple blend of paraffin wax and synthetic bees wax. All my projects are experimental at this point. Observed performance is our goal. We do not sell anything commercially.? cost only if you are interested.? 24v? 36v or 48v? ?available we can parallel? 90? ? ?180? ?270 or 360 ah? ? ? I use new West Marine heavy guage plastic battery boxes.??
I will send some pictures tomorrow.? I hope this helps.? ?Terminalift LLC 9444 Mission Park Place Santee, CA 92071 Ph: (619) 562-0355 F: (619) 562-2060
On Sunday, May 31, 2020, 07:53:28 AM PDT, Steve Gjertson < sgjertson@...> wrote:
Hi Larry,?
I have been following this thread and would be interested a 48 v battery system. My email is sgjertson@...?
I have an extra 500 ? ?3.2 v 90 ah?cylinders with??bms devices and chargers. We are using big prismatic cells ?for our next??high voltage battery project ? I could duplicate my 48 v lifepo4?set up and charge only material cost if you are interested ?I will get you some pictures. We are in San Diego? Best regards, Larry Schmitz
On Friday, May 22, 2020, 5:21 AM, Larry Brown <elcapitanbrown@...> wrote: Mine is Thunderstruck too.? For your size boat you can go with air cooled but need to make sure to get and engine compartment fan to circulate air.? No more water intake to get clogged with sea grass or some idiot¡¯s shopping bag floating by as you motor.? One of the beauties of the system.? It should push you just fine.? I use a couple eu2000 generators as backup for long distance trips but for day trips where you need a couple hours at most you can get by on batteries.
Anyway, good luck. ?
Larry On May 21, 2020, at 11:01 PM, Ryan Sweet <ryan@...> wrote:
?
Do you have a link for the batteries you had success with? There are so many on offer and it seems quite hard to find much info about each company except for the us based ones and those are all twice as expensive (I recognize that this is possibly for good reasons).? ?
I have had good luck with my 10kw?thunderstruck kit too. First installed 4??agm?batteries ? 12v 220 ah.?Then after 2 years replaced with lifepo4. An excellent upgrade?I assembled 4 battery boxes with 3.2v 90ah cylinders. Each box 4P4S?Then installed an?ant bms for balancing. The monitor is very good??for checking your system. If you decide to assemble your own battery system invest in a Flir Heat sensor. The Flir connects to your I?phone. You aim it at your wiring assembly under load. It detects hot spot?areas of concern in your connections. Battery, contactor ,controller and motor connections. 48 v 360 ah gives plenty of run time at 40 to 90 amp load.? Best regards, Larry Schmitz
On Thursday, May 21, 2020, 4:16 PM, Reuben Trane via <rjtrane=[email protected]> wrote: Go to and look at their kits. I purchased 2 ea for my 12m Power cat. For your needs a 5kW to 10kW motor should do the job. Hard part is figuring out the reduction. I chose 3:1 to get a max prop RPM of 800.
48Vdc woks best. If it¡¯s in your budget assemble a battery from LiFePo4 cells
Feel free to ask me about my installation.
Reuben
|
toggle quoted message
Show quoted text
Hello Fred,? The 48 v? 90 ah pack is pretty easy to assemble. That will be 16 cylinders.? You can fit them in 1 West Marine heavy duty battery box.? Weight will be about 85 lbs.? ?Just assemble bus bars to place in series. Then add a bms? and charger. I will check costs on these and forward to you. thank you? kind regards Larry Schmitz
?Terminalift LLC 9444 Mission Park Place Santee, CA 92071 Ph: (619) 562-0355 F: (619) 562-2060
On Tuesday, June 2, 2020, 05:27:23 PM PDT, fred jelich < freddyj408@...> wrote:
I'd be interested in 48v? 90ah for my boat! Hello Steve,? sorry for the delay.? ?I can sell you some of my extra cells.? 3.2 v 90 ah? I am happy with my 10 kw? 48v thunderstruck project? We are experimenting with cylinders and prisms for my work projects.? I can assemble and charge (cost only for a bms and bus bars.)? We are adding a phase change material to our boxes to minimize possible heat and waterproof my battery packs. It is a simple blend of paraffin wax and synthetic bees wax. All my projects are experimental at this point. Observed performance is our goal. We do not sell anything commercially.? cost only if you are interested.? 24v? 36v or 48v? ?available we can parallel? 90? ? ?180? ?270 or 360 ah? ? ? I use new West Marine heavy guage plastic battery boxes.??
I will send some pictures tomorrow.? I hope this helps.? ?Terminalift LLC 9444 Mission Park Place Santee, CA 92071 Ph: (619) 562-0355 F: (619) 562-2060
On Sunday, May 31, 2020, 07:53:28 AM PDT, Steve Gjertson < sgjertson@...> wrote:
Hi Larry,?
I have been following this thread and would be interested a 48 v battery system. My email is sgjertson@...?
I have an extra 500 ? ?3.2 v 90 ah?cylinders with??bms devices and chargers. We are using big prismatic cells ?for our next??high voltage battery project ? I could duplicate my 48 v lifepo4?set up and charge only material cost if you are interested ?I will get you some pictures. We are in San Diego? Best regards, Larry Schmitz
On Friday, May 22, 2020, 5:21 AM, Larry Brown <elcapitanbrown@...> wrote: Mine is Thunderstruck too.? For your size boat you can go with air cooled but need to make sure to get and engine compartment fan to circulate air.? No more water intake to get clogged with sea grass or some idiot¡¯s shopping bag floating by as you motor.? One of the beauties of the system.? It should push you just fine.? I use a couple eu2000 generators as backup for long distance trips but for day trips where you need a couple hours at most you can get by on batteries.
Anyway, good luck. ?
Larry On May 21, 2020, at 11:01 PM, Ryan Sweet <ryan@...> wrote:
?
Do you have a link for the batteries you had success with? There are so many on offer and it seems quite hard to find much info about each company except for the us based ones and those are all twice as expensive (I recognize that this is possibly for good reasons).? ?
I have had good luck with my 10kw?thunderstruck kit too. First installed 4??agm?batteries ? 12v 220 ah.?Then after 2 years replaced with lifepo4. An excellent upgrade?I assembled 4 battery boxes with 3.2v 90ah cylinders. Each box 4P4S?Then installed an?ant bms for balancing. The monitor is very good??for checking your system. If you decide to assemble your own battery system invest in a Flir Heat sensor. The Flir connects to your I?phone. You aim it at your wiring assembly under load. It detects hot spot?areas of concern in your connections. Battery, contactor ,controller and motor connections. 48 v 360 ah gives plenty of run time at 40 to 90 amp load.? Best regards, Larry Schmitz
On Thursday, May 21, 2020, 4:16 PM, Reuben Trane via <rjtrane=[email protected]> wrote: Go to and look at their kits. I purchased 2 ea for my 12m Power cat. For your needs a 5kW to 10kW motor should do the job. Hard part is figuring out the reduction. I chose 3:1 to get a max prop RPM of 800.
48Vdc woks best. If it¡¯s in your budget assemble a battery from LiFePo4 cells
Feel free to ask me about my installation.
Reuben
|
Can I ask what those go for? A Google search didn't show any
immediate prices.
On 6/3/2020 2:37 PM, Eric via groups.io
wrote:
toggle quoted message
Show quoted text
+1 for the Browning gear box.? I'm using a CbN-3201-SB3-2.5 with
the NEMA spec C-face adapter, my Motenergy PMAC motor bolted right
up to it.? The Browning gear boxes are industrial grade with
service levels of 10,000 hours before changing the factory oil.?
They are figuratively, and maybe literally, bulletproof.? They are
relatively inexpensive, small, light, quiet, and efficient.? These
gear boxes are available for various power levels and in a variety
of different gear ratios, My box ratio is 2.55-1.? You can see a
pic in the "Eric's Serenity" photo album in this group.??/g/electricboats/album?id=190248?
Fair winds,
Eric
|
I don't seem to be able to find anyone who sells those in Australia and my motor is german and has metric mounts and what? I can find seems to indicate these gearboxes use imperial dimensions. (My country?went 100% metric system when I was a child, I don't even have any ability to estimate?sizes/lengths?in imperial units, only metric) Other than that, the gearbox looks ideal for me, it will fit in the old engine bay and has no nasty?spinning bits. The thunderstruck belt drive is wonderfully simple but would require rebuilding my engine box to be higher and would need a guard around the belt.
+1 for the Browning gear box.? I'm using a CbN-3201-SB3-2.5 with the NEMA spec C-face adapter, my Motenergy PMAC motor bolted right up to it.? The Browning gear boxes are industrial grade with service levels of 10,000 hours before changing the factory oil.? They are figuratively, and maybe literally, bulletproof.? They are relatively inexpensive, small, light, quiet, and efficient.? These gear boxes are available for various power levels and in a variety of different gear ratios, My box ratio is 2.55-1.? You can see a pic in the "Eric's Serenity" photo album in this group.??/g/electricboats/album?id=190248?
Fair winds,
Eric
|
Re: Time to re-power >> How many cells??
On Wed, Jun 3, 2020 at 10:36 AM, john wrote:
Silly question...? ?Though I hope to get several answers!
?
Why 16 cells?
?
These are 3.2V nominal cells, right?
They charge up to 3.65V, and can discharge down to 2.2V?? ?
So, to give plenty of margin, maybe run between 2.75V for a low, and max of 3.5V?
?
For 15 cells, that gives:? 41.25 to 52.5.
For 16 cells, that would be:? 44 to 56V
?
It would seem like the 15 cells hits the 48V range easily enough.
Are people rounding up to 16 cells just so that they have an even number to work with??
As one example, the Torqeedo 4R has a lower limit cutoff (assuming Li and not lead) of 42V (lead setup is 36V) - so a 15 cell configuration would work reasonably.
?
Just curious what the thoughts were here.
?
Thanks,
John
Just keep in mind that a regular lead acid 12V battery has a resting voltage of 12.8V and a charging limit of about 15V, so a 48V nominal battery bank of golf cart batteries is has a resting voltage of 51.6V and a charge limit around 60V.? A lead acid battery bank with a resting voltage of only 48V needs to be looked at for replacement. ?My LiFePO4 16 cell bank has a resting voltage around 53V and drops below 52V as soon as normal load is applied, even when fully charged.? Heavy loads will drop my 16 cell bank below 48V, again, even when fully charged? While a 15 cell bank works, it puts you at the low end of the nominal voltage range for all of your components, increasing the amps pulled at any given load.? And you'll need a custom charging profile for you charger and custom thresholds for monitoring and protection.? The whole thing is a slippery slope.? If your only concern is trying to save 6% of your initial cost by buying 15 cells, rather than 16 cells, I personally don't see the justification...?? Fair winds, Eric
|
+1 for the Browning gear box.? I'm using a CbN-3201-SB3-2.5 with the NEMA spec C-face adapter, my Motenergy PMAC motor bolted right up to it.? The Browning gear boxes are industrial grade with service levels of 10,000 hours before changing the factory oil.? They are figuratively, and maybe literally, bulletproof.? They are relatively inexpensive, small, light, quiet, and efficient.? These gear boxes are available for various power levels and in a variety of different gear ratios, My box ratio is 2.55-1.? You can see a pic in the "Eric's Serenity" photo album in this group.?? /g/electricboats/album?id=190248?Fair winds, Eric
|
Re: Time to re-power >> How many cells??
Hello John,? I just potted this battery pack with a phase change material.? a blend of paraffin waxes? ?The idea is that my connections are completely sealed and waterproof. There are no voids so no movement within the battery box.? Wax will only soften or liquify in immediate vicinity of the cells. And only if the draw creates heat. I am doing an observed performance project for power of interior lights running lights tillermaster etc.? The 48 v lifepo 4 runs my 10kw thunderstruck motor system.?
?Terminalift LLC 9444 Mission Park Place Santee, CA 92071 Ph: (619) 562-0355 F: (619) 562-2060
On Wednesday, June 3, 2020, 12:47:06 PM PDT, john via groups.io <oak_box@...> wrote:
So are you saying some people use 15, and some use 16?
Obviously, 16 would give you a little more power, with more expense.?? Is there a common trend one way or the other?
I've been playing with an EBike battery pack from BTR.? ?"48V, 20Ah".? ?But no solid documentation on how many cells.? It's supposed to be LiFeP04.? The charger seems to be topping out around 57V.? Resting voltage after unplugging the charger is about 56V, and then it quickly drops down to 51/52V when a small load is applied.? ? I'm guessing this is a 16 cell battery.? ?But won't know absolutely unless I take one apart (which won't happen until I kill one.? <grin>).
John
On Wednesday, June 3, 2020, 02:32:21 PM CDT, L Schmitz via groups.io <terminalift@...> wrote:
Hello John,?? Good questions.?
Most 48v hardware has 60v capacitors inside so you can max out the voltage close to 60. With 16s it can reach 58.4v. 15s can be used as well. Will have a lower voltage cutoff but the device wont provide a redundant low voltage protection as it thinks it's got a 48v battery. So in short... it can be used just needs excellent monitoring and it only has 1 protection from over discharge
I hope this helps? ? thank you? kind regards Larry Schmitz
?Terminalift LLC 9444 Mission Park Place Santee, CA 92071 Ph: (619) 562-0355 F: (619) 562-2060
On Wednesday, June 3, 2020, 10:41:41 AM PDT, john via groups.io <oak_box@...> wrote:
Silly question...? ?Though I hope to get several answers!
Why 16 cells?
These are 3.2V nominal cells, right? They charge up to 3.65V, and can discharge down to 2.2V?? ? So, to give plenty of margin, maybe run between 2.75V for a low, and max of 3.5V?
For 15 cells, that gives:? 41.25 to 52.5. For 16 cells, that would be:? 44 to 56V
It would seem like the 15 cells hits the 48V range easily enough. Are people rounding up to 16 cells just so that they have an even number to work with?? As one example, the Torqeedo 4R has a lower limit cutoff (assuming Li and not lead) of 42V (lead setup is 36V) - so a 15 cell configuration would work reasonably.
Just curious what the thoughts were here.
Thanks, John
On Wednesday, June 3, 2020, 12:13:25 PM CDT, L Schmitz via groups.io <terminalift@...> wrote:
Hello Fred,? The 48 v? 90 ah pack is pretty easy to assemble. That will be 16 cylinders.? You can fit them in 1 West Marine heavy duty battery box.? Weight will be about 85 lbs.? ?Just assemble bus bars to place in series. Then add a bms? and charger. I will check costs on these and forward to you. thank you? kind regards Larry Schmitz
?Terminalift LLC 9444 Mission Park Place Santee, CA 92071 Ph: (619) 562-0355 F: (619) 562-2060
On Tuesday, June 2, 2020, 05:27:23 PM PDT, fred jelich <freddyj408@...> wrote:
I'd be interested in 48v? 90ah for my boat!
Hello Steve,? sorry for the delay.? ?I can sell you some of my extra cells.? 3.2 v 90 ah? I am happy with my 10 kw? 48v thunderstruck project? We are experimenting with cylinders and prisms for my work projects.? I can assemble and charge (cost only for a bms and bus bars.)? We are adding a phase change material to our boxes to minimize possible heat and waterproof my battery packs. It is a simple blend of paraffin wax and synthetic bees wax. All my projects are experimental at this point. Observed performance is our goal. We do not sell anything commercially.? cost only if you are interested.? 24v? 36v or 48v? ?available we can parallel? 90? ? ?180? ?270 or 360 ah? ? ? I use new West Marine heavy guage plastic battery boxes.??
I will send some pictures tomorrow.? I hope this helps.? ?Terminalift LLC 9444 Mission Park Place Santee, CA 92071 Ph: (619) 562-0355 F: (619) 562-2060
On Sunday, May 31, 2020, 07:53:28 AM PDT, Steve Gjertson < sgjertson@...> wrote:
Hi Larry,?
I have been following this thread and would be interested a 48 v battery system. My email is sgjertson@...?
I have an extra 500 ? ?3.2 v 90 ah?cylinders with??bms devices and chargers. We are using big prismatic cells ?for our next??high voltage battery project ? I could duplicate my 48 v lifepo4?set up and charge only material cost if you are interested ?I will get you some pictures. We are in San Diego? Best regards, Larry Schmitz
On Friday, May 22, 2020, 5:21 AM, Larry Brown <elcapitanbrown@...> wrote: Mine is Thunderstruck too.? For your size boat you can go with air cooled but need to make sure to get and engine compartment fan to circulate air.? No more water intake to get clogged with sea grass or some idiot¡¯s shopping bag floating by as you motor.? One of the beauties of the system.? It should push you just fine.? I use a couple eu2000 generators as backup for long distance trips but for day trips where you need a couple hours at most you can get by on batteries.
Anyway, good luck. ?
Larry On May 21, 2020, at 11:01 PM, Ryan Sweet <ryan@...> wrote:
?
Do you have a link for the batteries you had success with? There are so many on offer and it seems quite hard to find much info about each company except for the us based ones and those are all twice as expensive (I recognize that this is possibly for good reasons).? ?
I have had good luck with my 10kw?thunderstruck kit too. First installed 4??agm?batteries ? 12v 220 ah.?Then after 2 years replaced with lifepo4. An excellent upgrade?I assembled 4 battery boxes with 3.2v 90ah cylinders. Each box 4P4S?Then installed an?ant bms for balancing. The monitor is very good??for checking your system. If you decide to assemble your own battery system invest in a Flir Heat sensor. The Flir connects to your I?phone. You aim it at your wiring assembly under load. It detects hot spot?areas of concern in your connections. Battery, contactor ,controller and motor connections. 48 v 360 ah gives plenty of run time at 40 to 90 amp load.? Best regards, Larry Schmitz
On Thursday, May 21, 2020, 4:16 PM, Reuben Trane via <rjtrane=[email protected]> wrote: Go to and look at their kits. I purchased 2 ea for my 12m Power cat. For your needs a 5kW to 10kW motor should do the job. Hard part is figuring out the reduction. I chose 3:1 to get a max prop RPM of 800.
48Vdc woks best. If it¡¯s in your budget assemble a battery from LiFePo4 cells
Feel free to ask me about my installation.
Reuben
|
Re: Time to re-power >> How many cells??
And some of us use 12¡though a different chemistry. My Enerdel pack batteries are not LiFPo. Voltage range: 2.5 - 4.1vpc (pack: 30 - 49.2v) Nominal Pack Voltage: 42v ? That worked out well for me as I upgraded from 36v flooded PbA and didn¡¯t have to change my controller or 36-12v DCDC. Charger¡¯s a different story¡ ? -MT
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Show quoted text
From: [email protected] [mailto:[email protected]] On Behalf Of john via groups.io
Sent: Wednesday, June 3, 2020 12:47 PM
To: [email protected]
Subject: Re: [electricboats] Time to re-power >> How many cells??? So are you saying some people use 15, and some use 16? Obviously, 16 would give you a little more power, with more expense.?? Is there a common trend one way or the other? I've been playing with an EBike battery pack from BTR.? ?"48V, 20Ah".? ?But no solid documentation on how many cells.? It's supposed to be LiFeP04.? The charger seems to be topping out around 57V.? Resting voltage after unplugging the charger is about 56V, and then it quickly drops down to 51/52V when a small load is applied.? ? I'm guessing this is a 16 cell battery.? ?But won't know absolutely unless I take one apart (which won't happen until I kill one.? <grin>). On Wednesday, June 3, 2020, 02:32:21 PM CDT, L Schmitz via groups.io <terminalift@...> wrote: Hello John,?? Good questions.? Most 48v hardware has 60v capacitors inside so you can max out the voltage close to 60. With 16s it can reach 58.4v. 15s can be used as well. Will have a lower voltage cutoff but the device wont provide a redundant low voltage protection as it thinks it's got a 48v battery. So in short... it can be used just needs excellent monitoring and it only has 1 protection from over discharge I hope this helps? ? thank you? kind regards Larry Schmitz On Wednesday, June 3, 2020, 10:41:41 AM PDT, john via groups.io <oak_box@...> wrote: Silly question...? ?Though I hope to get several answers! These are 3.2V nominal cells, right? They charge up to 3.65V, and can discharge down to 2.2V?? ? So, to give plenty of margin, maybe run between 2.75V for a low, and max of 3.5V? For 15 cells, that gives:? 41.25 to 52.5. For 16 cells, that would be:? 44 to 56V It would seem like the 15 cells hits the 48V range easily enough. Are people rounding up to 16 cells just so that they have an even number to work with?? As one example, the Torqeedo 4R has a lower limit cutoff (assuming Li and not lead) of 42V (lead setup is 36V) - so a 15 cell configuration would work reasonably. Just curious what the thoughts were here. On Wednesday, June 3, 2020, 12:13:25 PM CDT, L Schmitz via groups.io <terminalift@...> wrote: Hello Fred,? The 48 v? 90 ah pack is pretty easy to assemble. That will be 16 cylinders.? You can fit them in 1 West Marine heavy duty battery box.? Weight will be about 85 lbs.? ?Just assemble bus bars to place in series. Then add a bms? and charger. I will check costs on these and forward to you. thank you? kind regards Larry Schmitz On Tuesday, June 2, 2020, 05:27:23 PM PDT, fred jelich <freddyj408@...> wrote: I'd be interested in 48v? 90ah for my boat! ? Hello Steve,? sorry for the delay.? ?I can sell you some of my extra cells.? 3.2 v 90 ah? I am happy with my 10 kw? 48v thunderstruck project? We are experimenting with cylinders and prisms for my work projects.? I can assemble and charge (cost only for a bms and bus bars.)? We are adding a phase change material to our boxes to minimize possible heat and waterproof my battery packs. It is a simple blend of paraffin wax and synthetic bees wax. All my projects are experimental at this point. Observed performance is our goal. We do not sell anything commercially.? cost only if you are interested.? 24v? 36v or 48v? ?available we can parallel? 90? ? ?180? ?270 or 360 ah? ? ? I use new West Marine heavy guage plastic battery boxes.?? I will send some pictures tomorrow.? I hope this helps.? On Sunday, May 31, 2020, 07:53:28 AM PDT, Steve Gjertson <sgjertson@...> wrote: Hi Larry,? I have been following this thread and would be interested a 48 v battery system. My email is sgjertson@...? ? I have an extra 500 ? ?3.2 v 90 ah?cylinders with??bms devices and chargers. We are using big prismatic cells ?for our next??high voltage battery project ? I could duplicate my 48 v lifepo4?set up and charge only material cost if you are interested ?I will get you some pictures. We are in San Diego?
? On Friday, May 22, 2020, 5:21 AM, Larry Brown <elcapitanbrown@...> wrote: Mine is Thunderstruck too.? For your size boat you can go with air cooled but need to make sure to get and engine compartment fan to circulate air.? No more water intake to get clogged with sea grass or some idiot¡¯s shopping bag floating by as you motor.? One of the beauties of the system.? It should push you just fine.? I use a couple eu2000 generators as backup for long distance trips but for day trips where you need a couple hours at most you can get by on batteries. Larry
On May 21, 2020, at 11:01 PM, Ryan Sweet <ryan@...> wrote:
Do you have a link for the batteries you had success with? There are so many on offer and it seems quite hard to find much info about each company except for the us based ones and those are all twice as expensive (I recognize that this is possibly for good reasons).? ?
I have had good luck with my 10kw?thunderstruck kit too. First installed 4??agm?batteries ? 12v 220 ah.?Then after 2 years replaced with lifepo4. An excellent upgrade?I assembled 4 battery boxes with 3.2v 90ah cylinders. Each box 4P4S?Then installed an?ant bms for balancing. The monitor is very good??for checking your system. If you decide to assemble your own battery system invest in a Flir Heat sensor. The Flir connects to your I?phone. You aim it at your wiring assembly under load. It detects hot spot?areas of concern in your connections. Battery, contactor ,controller and motor connections. 48 v 360 ah gives plenty of run time at 40 to 90 amp load.? ? On Thursday, May 21, 2020, 4:16 PM, Reuben Trane via <rjtrane=[email protected]> wrote: Go to and look at their kits. I purchased 2 ea for my 12m Power cat. For your needs a 5kW to 10kW motor should do the job. Hard part is figuring out the reduction. I chose 3:1 to get a max prop RPM of 800. 48Vdc woks best. If it¡¯s in your budget assemble a battery from LiFePo4 cells Feel free to ask me about my installation.
|
Re: Time to re-power >> How many cells??
another of my team says? 16 in series pack are easier to use because both positive and negative terminals are on one side because 16 is an even number. If it were 15 in series one of the lead terminals would be on the other side of the pack.? 41.25 volts seems kinda low to run a 48 volt system.?
I hope this helps? ?thank you? kind regards? ?Larry Schmitz
?Terminalift LLC 9444 Mission Park Place Santee, CA 92071 Ph: (619) 562-0355 F: (619) 562-2060
On Wednesday, June 3, 2020, 12:47:06 PM PDT, john via groups.io <oak_box@...> wrote:
So are you saying some people use 15, and some use 16?
Obviously, 16 would give you a little more power, with more expense.?? Is there a common trend one way or the other?
I've been playing with an EBike battery pack from BTR.? ?"48V, 20Ah".? ?But no solid documentation on how many cells.? It's supposed to be LiFeP04.? The charger seems to be topping out around 57V.? Resting voltage after unplugging the charger is about 56V, and then it quickly drops down to 51/52V when a small load is applied.? ? I'm guessing this is a 16 cell battery.? ?But won't know absolutely unless I take one apart (which won't happen until I kill one.? <grin>).
John
On Wednesday, June 3, 2020, 02:32:21 PM CDT, L Schmitz via groups.io <terminalift@...> wrote:
Hello John,?? Good questions.?
Most 48v hardware has 60v capacitors inside so you can max out the voltage close to 60. With 16s it can reach 58.4v. 15s can be used as well. Will have a lower voltage cutoff but the device wont provide a redundant low voltage protection as it thinks it's got a 48v battery. So in short... it can be used just needs excellent monitoring and it only has 1 protection from over discharge
I hope this helps? ? thank you? kind regards Larry Schmitz
?Terminalift LLC 9444 Mission Park Place Santee, CA 92071 Ph: (619) 562-0355 F: (619) 562-2060
On Wednesday, June 3, 2020, 10:41:41 AM PDT, john via groups.io <oak_box@...> wrote:
Silly question...? ?Though I hope to get several answers!
Why 16 cells?
These are 3.2V nominal cells, right? They charge up to 3.65V, and can discharge down to 2.2V?? ? So, to give plenty of margin, maybe run between 2.75V for a low, and max of 3.5V?
For 15 cells, that gives:? 41.25 to 52.5. For 16 cells, that would be:? 44 to 56V
It would seem like the 15 cells hits the 48V range easily enough. Are people rounding up to 16 cells just so that they have an even number to work with?? As one example, the Torqeedo 4R has a lower limit cutoff (assuming Li and not lead) of 42V (lead setup is 36V) - so a 15 cell configuration would work reasonably.
Just curious what the thoughts were here.
Thanks, John
On Wednesday, June 3, 2020, 12:13:25 PM CDT, L Schmitz via groups.io <terminalift@...> wrote:
Hello Fred,? The 48 v? 90 ah pack is pretty easy to assemble. That will be 16 cylinders.? You can fit them in 1 West Marine heavy duty battery box.? Weight will be about 85 lbs.? ?Just assemble bus bars to place in series. Then add a bms? and charger. I will check costs on these and forward to you. thank you? kind regards Larry Schmitz
?Terminalift LLC 9444 Mission Park Place Santee, CA 92071 Ph: (619) 562-0355 F: (619) 562-2060
On Tuesday, June 2, 2020, 05:27:23 PM PDT, fred jelich <freddyj408@...> wrote:
I'd be interested in 48v? 90ah for my boat!
Hello Steve,? sorry for the delay.? ?I can sell you some of my extra cells.? 3.2 v 90 ah? I am happy with my 10 kw? 48v thunderstruck project? We are experimenting with cylinders and prisms for my work projects.? I can assemble and charge (cost only for a bms and bus bars.)? We are adding a phase change material to our boxes to minimize possible heat and waterproof my battery packs. It is a simple blend of paraffin wax and synthetic bees wax. All my projects are experimental at this point. Observed performance is our goal. We do not sell anything commercially.? cost only if you are interested.? 24v? 36v or 48v? ?available we can parallel? 90? ? ?180? ?270 or 360 ah? ? ? I use new West Marine heavy guage plastic battery boxes.??
I will send some pictures tomorrow.? I hope this helps.? ?Terminalift LLC 9444 Mission Park Place Santee, CA 92071 Ph: (619) 562-0355 F: (619) 562-2060
On Sunday, May 31, 2020, 07:53:28 AM PDT, Steve Gjertson < sgjertson@...> wrote:
Hi Larry,?
I have been following this thread and would be interested a 48 v battery system. My email is sgjertson@...?
I have an extra 500 ? ?3.2 v 90 ah?cylinders with??bms devices and chargers. We are using big prismatic cells ?for our next??high voltage battery project ? I could duplicate my 48 v lifepo4?set up and charge only material cost if you are interested ?I will get you some pictures. We are in San Diego? Best regards, Larry Schmitz
On Friday, May 22, 2020, 5:21 AM, Larry Brown <elcapitanbrown@...> wrote: Mine is Thunderstruck too.? For your size boat you can go with air cooled but need to make sure to get and engine compartment fan to circulate air.? No more water intake to get clogged with sea grass or some idiot¡¯s shopping bag floating by as you motor.? One of the beauties of the system.? It should push you just fine.? I use a couple eu2000 generators as backup for long distance trips but for day trips where you need a couple hours at most you can get by on batteries.
Anyway, good luck. ?
Larry On May 21, 2020, at 11:01 PM, Ryan Sweet <ryan@...> wrote:
?
Do you have a link for the batteries you had success with? There are so many on offer and it seems quite hard to find much info about each company except for the us based ones and those are all twice as expensive (I recognize that this is possibly for good reasons).? ?
I have had good luck with my 10kw?thunderstruck kit too. First installed 4??agm?batteries ? 12v 220 ah.?Then after 2 years replaced with lifepo4. An excellent upgrade?I assembled 4 battery boxes with 3.2v 90ah cylinders. Each box 4P4S?Then installed an?ant bms for balancing. The monitor is very good??for checking your system. If you decide to assemble your own battery system invest in a Flir Heat sensor. The Flir connects to your I?phone. You aim it at your wiring assembly under load. It detects hot spot?areas of concern in your connections. Battery, contactor ,controller and motor connections. 48 v 360 ah gives plenty of run time at 40 to 90 amp load.? Best regards, Larry Schmitz
On Thursday, May 21, 2020, 4:16 PM, Reuben Trane via <rjtrane=[email protected]> wrote: Go to and look at their kits. I purchased 2 ea for my 12m Power cat. For your needs a 5kW to 10kW motor should do the job. Hard part is figuring out the reduction. I chose 3:1 to get a max prop RPM of 800.
48Vdc woks best. If it¡¯s in your budget assemble a battery from LiFePo4 cells
Feel free to ask me about my installation.
Reuben
|
Re: Time to re-power >> How many cells??
So are you saying some people use 15, and some use 16?
Obviously, 16 would give you a little more power, with more expense.?? Is there a common trend one way or the other?
I've been playing with an EBike battery pack from BTR.? ?"48V, 20Ah".? ?But no solid documentation on how many cells.? It's supposed to be LiFeP04.? The charger seems to be topping out around 57V.? Resting voltage after unplugging the charger is about 56V, and then it quickly drops down to 51/52V when a small load is applied.? ? I'm guessing this is a 16 cell battery.? ?But won't know absolutely unless I take one apart (which won't happen until I kill one.? <grin>).
John
On Wednesday, June 3, 2020, 02:32:21 PM CDT, L Schmitz via groups.io <terminalift@...> wrote:
Hello John,?? Good questions.?
Most 48v hardware has 60v capacitors inside so you can max out the voltage close to 60. With 16s it can reach 58.4v. 15s can be used as well. Will have a lower voltage cutoff but the device wont provide a redundant low voltage protection as it thinks it's got a 48v battery. So in short... it can be used just needs excellent monitoring and it only has 1 protection from over discharge
I hope this helps? ? thank you? kind regards Larry Schmitz
?Terminalift LLC 9444 Mission Park Place Santee, CA 92071 Ph: (619) 562-0355 F: (619) 562-2060
On Wednesday, June 3, 2020, 10:41:41 AM PDT, john via groups.io <oak_box@...> wrote:
Silly question...? ?Though I hope to get several answers!
Why 16 cells?
These are 3.2V nominal cells, right? They charge up to 3.65V, and can discharge down to 2.2V?? ? So, to give plenty of margin, maybe run between 2.75V for a low, and max of 3.5V?
For 15 cells, that gives:? 41.25 to 52.5. For 16 cells, that would be:? 44 to 56V
It would seem like the 15 cells hits the 48V range easily enough. Are people rounding up to 16 cells just so that they have an even number to work with?? As one example, the Torqeedo 4R has a lower limit cutoff (assuming Li and not lead) of 42V (lead setup is 36V) - so a 15 cell configuration would work reasonably.
Just curious what the thoughts were here.
Thanks, John
On Wednesday, June 3, 2020, 12:13:25 PM CDT, L Schmitz via groups.io <terminalift@...> wrote:
Hello Fred,? The 48 v? 90 ah pack is pretty easy to assemble. That will be 16 cylinders.? You can fit them in 1 West Marine heavy duty battery box.? Weight will be about 85 lbs.? ?Just assemble bus bars to place in series. Then add a bms? and charger. I will check costs on these and forward to you. thank you? kind regards Larry Schmitz
?Terminalift LLC 9444 Mission Park Place Santee, CA 92071 Ph: (619) 562-0355 F: (619) 562-2060
On Tuesday, June 2, 2020, 05:27:23 PM PDT, fred jelich <freddyj408@...> wrote:
I'd be interested in 48v? 90ah for my boat!
Hello Steve,? sorry for the delay.? ?I can sell you some of my extra cells.? 3.2 v 90 ah? I am happy with my 10 kw? 48v thunderstruck project? We are experimenting with cylinders and prisms for my work projects.? I can assemble and charge (cost only for a bms and bus bars.)? We are adding a phase change material to our boxes to minimize possible heat and waterproof my battery packs. It is a simple blend of paraffin wax and synthetic bees wax. All my projects are experimental at this point. Observed performance is our goal. We do not sell anything commercially.? cost only if you are interested.? 24v? 36v or 48v? ?available we can parallel? 90? ? ?180? ?270 or 360 ah? ? ? I use new West Marine heavy guage plastic battery boxes.??
I will send some pictures tomorrow.? I hope this helps.? ?Terminalift LLC 9444 Mission Park Place Santee, CA 92071 Ph: (619) 562-0355 F: (619) 562-2060
On Sunday, May 31, 2020, 07:53:28 AM PDT, Steve Gjertson < sgjertson@...> wrote:
Hi Larry,?
I have been following this thread and would be interested a 48 v battery system. My email is sgjertson@...?
I have an extra 500 ? ?3.2 v 90 ah?cylinders with??bms devices and chargers. We are using big prismatic cells ?for our next??high voltage battery project ? I could duplicate my 48 v lifepo4?set up and charge only material cost if you are interested ?I will get you some pictures. We are in San Diego? Best regards, Larry Schmitz
On Friday, May 22, 2020, 5:21 AM, Larry Brown <elcapitanbrown@...> wrote: Mine is Thunderstruck too.? For your size boat you can go with air cooled but need to make sure to get and engine compartment fan to circulate air.? No more water intake to get clogged with sea grass or some idiot¡¯s shopping bag floating by as you motor.? One of the beauties of the system.? It should push you just fine.? I use a couple eu2000 generators as backup for long distance trips but for day trips where you need a couple hours at most you can get by on batteries.
Anyway, good luck. ?
Larry On May 21, 2020, at 11:01 PM, Ryan Sweet <ryan@...> wrote:
?
Do you have a link for the batteries you had success with? There are so many on offer and it seems quite hard to find much info about each company except for the us based ones and those are all twice as expensive (I recognize that this is possibly for good reasons).? ?
I have had good luck with my 10kw?thunderstruck kit too. First installed 4??agm?batteries ? 12v 220 ah.?Then after 2 years replaced with lifepo4. An excellent upgrade?I assembled 4 battery boxes with 3.2v 90ah cylinders. Each box 4P4S?Then installed an?ant bms for balancing. The monitor is very good??for checking your system. If you decide to assemble your own battery system invest in a Flir Heat sensor. The Flir connects to your I?phone. You aim it at your wiring assembly under load. It detects hot spot?areas of concern in your connections. Battery, contactor ,controller and motor connections. 48 v 360 ah gives plenty of run time at 40 to 90 amp load.? Best regards, Larry Schmitz
On Thursday, May 21, 2020, 4:16 PM, Reuben Trane via <rjtrane=[email protected]> wrote: Go to and look at their kits. I purchased 2 ea for my 12m Power cat. For your needs a 5kW to 10kW motor should do the job. Hard part is figuring out the reduction. I chose 3:1 to get a max prop RPM of 800.
48Vdc woks best. If it¡¯s in your budget assemble a battery from LiFePo4 cells
Feel free to ask me about my installation.
Reuben
|
Re: Time to re-power >> How many cells??
Hello John,?? Good questions.?
Most 48v hardware has 60v capacitors inside so you can max out the voltage close to 60. With 16s it can reach 58.4v. 15s can be used as well. Will have a lower voltage cutoff but the device wont provide a redundant low voltage protection as it thinks it's got a 48v battery. So in short... it can be used just needs excellent monitoring and it only has 1 protection from over discharge
I hope this helps? ? thank you? kind regards Larry Schmitz
?Terminalift LLC 9444 Mission Park Place Santee, CA 92071 Ph: (619) 562-0355 F: (619) 562-2060
On Wednesday, June 3, 2020, 10:41:41 AM PDT, john via groups.io <oak_box@...> wrote:
Silly question...? ?Though I hope to get several answers!
Why 16 cells?
These are 3.2V nominal cells, right? They charge up to 3.65V, and can discharge down to 2.2V?? ? So, to give plenty of margin, maybe run between 2.75V for a low, and max of 3.5V?
For 15 cells, that gives:? 41.25 to 52.5. For 16 cells, that would be:? 44 to 56V
It would seem like the 15 cells hits the 48V range easily enough. Are people rounding up to 16 cells just so that they have an even number to work with?? As one example, the Torqeedo 4R has a lower limit cutoff (assuming Li and not lead) of 42V (lead setup is 36V) - so a 15 cell configuration would work reasonably.
Just curious what the thoughts were here.
Thanks, John
On Wednesday, June 3, 2020, 12:13:25 PM CDT, L Schmitz via groups.io <terminalift@...> wrote:
Hello Fred,? The 48 v? 90 ah pack is pretty easy to assemble. That will be 16 cylinders.? You can fit them in 1 West Marine heavy duty battery box.? Weight will be about 85 lbs.? ?Just assemble bus bars to place in series. Then add a bms? and charger. I will check costs on these and forward to you. thank you? kind regards Larry Schmitz
?Terminalift LLC 9444 Mission Park Place Santee, CA 92071 Ph: (619) 562-0355 F: (619) 562-2060
On Tuesday, June 2, 2020, 05:27:23 PM PDT, fred jelich <freddyj408@...> wrote:
I'd be interested in 48v? 90ah for my boat!
Hello Steve,? sorry for the delay.? ?I can sell you some of my extra cells.? 3.2 v 90 ah? I am happy with my 10 kw? 48v thunderstruck project? We are experimenting with cylinders and prisms for my work projects.? I can assemble and charge (cost only for a bms and bus bars.)? We are adding a phase change material to our boxes to minimize possible heat and waterproof my battery packs. It is a simple blend of paraffin wax and synthetic bees wax. All my projects are experimental at this point. Observed performance is our goal. We do not sell anything commercially.? cost only if you are interested.? 24v? 36v or 48v? ?available we can parallel? 90? ? ?180? ?270 or 360 ah? ? ? I use new West Marine heavy guage plastic battery boxes.??
I will send some pictures tomorrow.? I hope this helps.? ?Terminalift LLC 9444 Mission Park Place Santee, CA 92071 Ph: (619) 562-0355 F: (619) 562-2060
On Sunday, May 31, 2020, 07:53:28 AM PDT, Steve Gjertson < sgjertson@...> wrote:
Hi Larry,?
I have been following this thread and would be interested a 48 v battery system. My email is sgjertson@...?
I have an extra 500 ? ?3.2 v 90 ah?cylinders with??bms devices and chargers. We are using big prismatic cells ?for our next??high voltage battery project ? I could duplicate my 48 v lifepo4?set up and charge only material cost if you are interested ?I will get you some pictures. We are in San Diego? Best regards, Larry Schmitz
On Friday, May 22, 2020, 5:21 AM, Larry Brown <elcapitanbrown@...> wrote: Mine is Thunderstruck too.? For your size boat you can go with air cooled but need to make sure to get and engine compartment fan to circulate air.? No more water intake to get clogged with sea grass or some idiot¡¯s shopping bag floating by as you motor.? One of the beauties of the system.? It should push you just fine.? I use a couple eu2000 generators as backup for long distance trips but for day trips where you need a couple hours at most you can get by on batteries.
Anyway, good luck. ?
Larry On May 21, 2020, at 11:01 PM, Ryan Sweet <ryan@...> wrote:
?
Do you have a link for the batteries you had success with? There are so many on offer and it seems quite hard to find much info about each company except for the us based ones and those are all twice as expensive (I recognize that this is possibly for good reasons).? ?
I have had good luck with my 10kw?thunderstruck kit too. First installed 4??agm?batteries ? 12v 220 ah.?Then after 2 years replaced with lifepo4. An excellent upgrade?I assembled 4 battery boxes with 3.2v 90ah cylinders. Each box 4P4S?Then installed an?ant bms for balancing. The monitor is very good??for checking your system. If you decide to assemble your own battery system invest in a Flir Heat sensor. The Flir connects to your I?phone. You aim it at your wiring assembly under load. It detects hot spot?areas of concern in your connections. Battery, contactor ,controller and motor connections. 48 v 360 ah gives plenty of run time at 40 to 90 amp load.? Best regards, Larry Schmitz
On Thursday, May 21, 2020, 4:16 PM, Reuben Trane via <rjtrane=[email protected]> wrote: Go to and look at their kits. I purchased 2 ea for my 12m Power cat. For your needs a 5kW to 10kW motor should do the job. Hard part is figuring out the reduction. I chose 3:1 to get a max prop RPM of 800.
48Vdc woks best. If it¡¯s in your budget assemble a battery from LiFePo4 cells
Feel free to ask me about my installation.
Reuben
|
Re: Time to re-power >> How many cells??
Silly question...? ?Though I hope to get several answers!
Why 16 cells?
These are 3.2V nominal cells, right? They charge up to 3.65V, and can discharge down to 2.2V?? ? So, to give plenty of margin, maybe run between 2.75V for a low, and max of 3.5V?
For 15 cells, that gives:? 41.25 to 52.5. For 16 cells, that would be:? 44 to 56V
It would seem like the 15 cells hits the 48V range easily enough. Are people rounding up to 16 cells just so that they have an even number to work with?? As one example, the Torqeedo 4R has a lower limit cutoff (assuming Li and not lead) of 42V (lead setup is 36V) - so a 15 cell configuration would work reasonably.
Just curious what the thoughts were here.
Thanks, John
On Wednesday, June 3, 2020, 12:13:25 PM CDT, L Schmitz via groups.io <terminalift@...> wrote:
Hello Fred,? The 48 v? 90 ah pack is pretty easy to assemble. That will be 16 cylinders.? You can fit them in 1 West Marine heavy duty battery box.? Weight will be about 85 lbs.? ?Just assemble bus bars to place in series. Then add a bms? and charger. I will check costs on these and forward to you. thank you? kind regards Larry Schmitz
?Terminalift LLC 9444 Mission Park Place Santee, CA 92071 Ph: (619) 562-0355 F: (619) 562-2060
On Tuesday, June 2, 2020, 05:27:23 PM PDT, fred jelich <freddyj408@...> wrote:
I'd be interested in 48v? 90ah for my boat!
Hello Steve,? sorry for the delay.? ?I can sell you some of my extra cells.? 3.2 v 90 ah? I am happy with my 10 kw? 48v thunderstruck project? We are experimenting with cylinders and prisms for my work projects.? I can assemble and charge (cost only for a bms and bus bars.)? We are adding a phase change material to our boxes to minimize possible heat and waterproof my battery packs. It is a simple blend of paraffin wax and synthetic bees wax. All my projects are experimental at this point. Observed performance is our goal. We do not sell anything commercially.? cost only if you are interested.? 24v? 36v or 48v? ?available we can parallel? 90? ? ?180? ?270 or 360 ah? ? ? I use new West Marine heavy guage plastic battery boxes.??
I will send some pictures tomorrow.? I hope this helps.? ?Terminalift LLC 9444 Mission Park Place Santee, CA 92071 Ph: (619) 562-0355 F: (619) 562-2060
On Sunday, May 31, 2020, 07:53:28 AM PDT, Steve Gjertson < sgjertson@...> wrote:
Hi Larry,?
I have been following this thread and would be interested a 48 v battery system. My email is sgjertson@...?
I have an extra 500 ? ?3.2 v 90 ah?cylinders with??bms devices and chargers. We are using big prismatic cells ?for our next??high voltage battery project ? I could duplicate my 48 v lifepo4?set up and charge only material cost if you are interested ?I will get you some pictures. We are in San Diego? Best regards, Larry Schmitz
On Friday, May 22, 2020, 5:21 AM, Larry Brown <elcapitanbrown@...> wrote: Mine is Thunderstruck too.? For your size boat you can go with air cooled but need to make sure to get and engine compartment fan to circulate air.? No more water intake to get clogged with sea grass or some idiot¡¯s shopping bag floating by as you motor.? One of the beauties of the system.? It should push you just fine.? I use a couple eu2000 generators as backup for long distance trips but for day trips where you need a couple hours at most you can get by on batteries.
Anyway, good luck. ?
Larry On May 21, 2020, at 11:01 PM, Ryan Sweet <ryan@...> wrote:
?
Do you have a link for the batteries you had success with? There are so many on offer and it seems quite hard to find much info about each company except for the us based ones and those are all twice as expensive (I recognize that this is possibly for good reasons).? ?
I have had good luck with my 10kw?thunderstruck kit too. First installed 4??agm?batteries ? 12v 220 ah.?Then after 2 years replaced with lifepo4. An excellent upgrade?I assembled 4 battery boxes with 3.2v 90ah cylinders. Each box 4P4S?Then installed an?ant bms for balancing. The monitor is very good??for checking your system. If you decide to assemble your own battery system invest in a Flir Heat sensor. The Flir connects to your I?phone. You aim it at your wiring assembly under load. It detects hot spot?areas of concern in your connections. Battery, contactor ,controller and motor connections. 48 v 360 ah gives plenty of run time at 40 to 90 amp load.? Best regards, Larry Schmitz
On Thursday, May 21, 2020, 4:16 PM, Reuben Trane via <rjtrane=[email protected]> wrote: Go to and look at their kits. I purchased 2 ea for my 12m Power cat. For your needs a 5kW to 10kW motor should do the job. Hard part is figuring out the reduction. I chose 3:1 to get a max prop RPM of 800.
48Vdc woks best. If it¡¯s in your budget assemble a battery from LiFePo4 cells
Feel free to ask me about my installation.
Reuben
|
Hello Fred,? The 48 v? 90 ah pack is pretty easy to assemble. That will be 16 cylinders.? You can fit them in 1 West Marine heavy duty battery box.? Weight will be about 85 lbs.? ?Just assemble bus bars to place in series. Then add a bms? and charger. I will check costs on these and forward to you. thank you? kind regards Larry Schmitz
?Terminalift LLC 9444 Mission Park Place Santee, CA 92071 Ph: (619) 562-0355 F: (619) 562-2060
On Tuesday, June 2, 2020, 05:27:23 PM PDT, fred jelich <freddyj408@...> wrote:
I'd be interested in 48v? 90ah for my boat!
Hello Steve,? sorry for the delay.? ?I can sell you some of my extra cells.? 3.2 v 90 ah? I am happy with my 10 kw? 48v thunderstruck project? We are experimenting with cylinders and prisms for my work projects.? I can assemble and charge (cost only for a bms and bus bars.)? We are adding a phase change material to our boxes to minimize possible heat and waterproof my battery packs. It is a simple blend of paraffin wax and synthetic bees wax. All my projects are experimental at this point. Observed performance is our goal. We do not sell anything commercially.? cost only if you are interested.? 24v? 36v or 48v? ?available we can parallel? 90? ? ?180? ?270 or 360 ah? ? ? I use new West Marine heavy guage plastic battery boxes.??
I will send some pictures tomorrow.? I hope this helps.? ?Terminalift LLC 9444 Mission Park Place Santee, CA 92071 Ph: (619) 562-0355 F: (619) 562-2060
On Sunday, May 31, 2020, 07:53:28 AM PDT, Steve Gjertson < sgjertson@...> wrote:
Hi Larry,?
I have been following this thread and would be interested a 48 v battery system. My email is sgjertson@...?
I have an extra 500 ? ?3.2 v 90 ah?cylinders with??bms devices and chargers. We are using big prismatic cells ?for our next??high voltage battery project ? I could duplicate my 48 v lifepo4?set up and charge only material cost if you are interested ?I will get you some pictures. We are in San Diego? Best regards, Larry Schmitz
On Friday, May 22, 2020, 5:21 AM, Larry Brown <elcapitanbrown@...> wrote: Mine is Thunderstruck too.? For your size boat you can go with air cooled but need to make sure to get and engine compartment fan to circulate air.? No more water intake to get clogged with sea grass or some idiot¡¯s shopping bag floating by as you motor.? One of the beauties of the system.? It should push you just fine.? I use a couple eu2000 generators as backup for long distance trips but for day trips where you need a couple hours at most you can get by on batteries.
Anyway, good luck. ?
Larry On May 21, 2020, at 11:01 PM, Ryan Sweet <ryan@...> wrote:
?
Do you have a link for the batteries you had success with? There are so many on offer and it seems quite hard to find much info about each company except for the us based ones and those are all twice as expensive (I recognize that this is possibly for good reasons).? ?
I have had good luck with my 10kw?thunderstruck kit too. First installed 4??agm?batteries ? 12v 220 ah.?Then after 2 years replaced with lifepo4. An excellent upgrade?I assembled 4 battery boxes with 3.2v 90ah cylinders. Each box 4P4S?Then installed an?ant bms for balancing. The monitor is very good??for checking your system. If you decide to assemble your own battery system invest in a Flir Heat sensor. The Flir connects to your I?phone. You aim it at your wiring assembly under load. It detects hot spot?areas of concern in your connections. Battery, contactor ,controller and motor connections. 48 v 360 ah gives plenty of run time at 40 to 90 amp load.? Best regards, Larry Schmitz
On Thursday, May 21, 2020, 4:16 PM, Reuben Trane via <rjtrane=[email protected]> wrote: Go to and look at their kits. I purchased 2 ea for my 12m Power cat. For your needs a 5kW to 10kW motor should do the job. Hard part is figuring out the reduction. I chose 3:1 to get a max prop RPM of 800.
48Vdc woks best. If it¡¯s in your budget assemble a battery from LiFePo4 cells
Feel free to ask me about my installation.
Reuben
|
Re: AC vs DC gensets, how many?
Check Out this blog. They have a 44¡¯ Lagoon and I believe they are operating a dual genset. Other than that Their system is a Solomons Tech. setup like mine with us having some different equipment upgrades and I run LiPo¡¯s. ? Steve in Solomons MD Lagoon 410 S2E ?
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From: [email protected] < [email protected]> On Behalf Of Robert McArthur Sent: Tuesday, June 2, 2020 9:07 PM To: [email protected]Subject: [electricboats] AC vs DC gensets, how many? ? We are in planning to parallel hybridise our 50' powercat. One of the questions (of many!) is the genset. We have an old Onan 6.5kW AC. We would probably remove it.? But we will need more than solar to keep us going for many hours at slower speeds (higher speed = diesels). Do we go with large alternators off the diesels (maybe get 2kW off each) to supplement solar, or 1-2 gensets as main power supplemented by solar?? 2kW or even 4kW isnt going to be enough, so big alternators are probably out. Given AC gensets are more common, and the i-series from fisher panda are variable speed, is there a lot of difference in this application to use AC or DC? Also, apart from some obvious points, are there any advantages/disadvantages in two small units vs one? The i-series can parallel each other which seems an advantage for 2 units...
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I recently reviewed my sea trial data for Sunshine, a 12m, 23,000# cat using twin ME1302 10kW water-cooled PMAC motors from Thunderstruck with a 3:1 reduction.?
if you are OK wire a cruising speed of 5 knots, I feel you could get that using a single 10kW motor - I am able to get 5 knots using 3,6kW per motor - 7.2kW total. If you used 7.4kW you¡¯d get 2,200 RPM from a single. You can do the math to see what ROM your prop currently turns at 5 knots to figure the necessary reduction. At full power you¡¯d have an extra 200 RPM based on my sea trial - this May yield up to an additional 1/2 knot if faced with head currants for a short period of time.?
this way you can keep your battery at 48v which makes life a lot simpler.?
5/12/16
07:30-11:35. SEA TRIALS:
3.5 kts - 1.0 kW (per motor) - 1,100 RPM
4.0 kts - 1.6 kW - 1,300
4.5 kts - 2.4 kW - 120F - 1,500
5.0 kts - 3.6 kW - 1,700
5.5 kts - 5.0 kW - 1,950
6.0 kts - 7.4 kW - 2,200
6.3 kts - 10.0 kW - 239F - 2,400
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Re: AC vs DC gensets, how many?
You say you are doing a parallel hybrid. I have used the Steyr system in my 12m solar cat. My assumption is that your system, like my Steyr one, charges the battery while the diesel is propelling the boat. I have a 48Vdc LFP battery pack.?
You should not need additional generator(s). Since you¡¯ll have two systems, you can also run one side on diesel abd the other on electric if your battery is low. This uses less fuel than running both motors on diesel at similar speeds.?
at anchor, you can also run one diesel in neutral to charge the battery. Since you generate DC power, this is more efficient than running an AC generator and converting to DC.?
while you¡¯re at it, I¡¯d suggest you run all your AC loads thru inverter(s) using shore power to only charge your battery thru a dedicated charger.?
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I ended using a Browning EPT 3200 series helical gear drive with C Face adapter for my set up. Downside I needed to have a drop pan fabricated to sit over the stringers in the engine compartment.?
On Wed, Jun 3, 2020, 3:44 AM Bill Farina < bill@...> wrote: Thunderstruck has a pre-built reduction that might work for you.
On 6/2/2020 11:47 PM, Matthew Geier wrote:
> I'm looking into re-battery and a general re-jigging of my system.
>
> I've been running a 36v system but never running the controller over
> 50% throttle. Now that my T145s have shown signs of needing to be
> replaced after 11years, i'm thinking of going LiFePO ? on 48v and
> putting a 2:1 reduction on my Perm 132 perm mag motor. This would
> enable the motor to run faster at lower amps (cooler) and also have
> the motor running most of the time in the 'forward' direction. At my
> power output and voltage that the motor is running in reverse most of
> the time isn't actually a problem, but the brushes may last just that
> little bit longer with the motor running the 'correct' way. :-)
>
> Any one have any points to a high efficiency gearbox of approx 2:1
> ratio ? Most of the examples I've found so far also include clutches,
> a feature not needed here.
>
> About 2.4-3kw moves my boat at hull speed, so I don't need something
> of high power capability.
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Matthew Geier
Reuben Trane