Re: Two voltage battery banks on one charger
Solar Boost Controller? ³§±è±ð³¦¾±´Ú¾±³¦²¹³Ù¾±´Ç²Ô²õ£º °ä´Ç±ô´Ç°ù£ºµþ±ô²¹³¦°ì²Ñ²¹³Ù±ð°ù¾±²¹±ô£º²Ñ±ð³Ù²¹±ôSize£º11 * 10.3 * 4.2cm / 4.33 * 4.05 * 1.65inWeight£º360g / 12.69ozInput Voltage£º15-45VOutput Voltage£º48V/62V/78V
On Sat, Sep 5, 2020 at 11:10 AM Peter Zephyr < Pcbeckett@...> wrote: Thanks for this explanation.? Can you tell me the model of Boost controller ?? Rgds Peter On Sep 5, 2020, at 10:44 AM, reesekc <kcr@...> wrote:
? I've tried several of the ideas listed on this subject...? what has worked best for me: I presently have 2 x 100w solar panels connected in series to provide 24v plus. I use a "boost" mppt solar controller?(requires?a minimum of 15v input and provides about 54v max output) to charge my 48v battery bank. The solar is connected all-the-time. I then use a 48v to 12v DC to DC converter to provide boat power. When needed, I plug in a standard 48v Golf Cart Charger into either dock power or my 2k generator. On longer motoring periods, I found that I can hold 3.3 Knots continuously using the generator while still holding the existing battery charge. FYI... I have a Sloop rig 35.5 ft Hughes Sailboat. They make 12v batt chargers that take 48v input.? I have one but haven't installed yet as I still have a separate panel and charge controller for 12v.? I want that real estate back though so I can use for another panel for 48v charging :-) On Sep 4, 2020, at 10:19 PM, Tommy rochester <troche289@...> wrote:
? Do you know what it's called so I can research it? Our maybe the name of the company?
How do I connect the generator to the charger. The charger I'm using will let me combine wind and solar and it will switch between automatically. I'm not using wind so I'm thinking I could tie in to that spot on the charger. But I need to convert the power from ac to dc for that to work. Honestly not sure of a really good way to do it.? There is a company in the UK that makes a generator starter when the battery voltage drops below 11.8v the gen set turns on and turns off at 12.8v or so.? All automatic.? I have one but never installed it. Cost was about $75 with a waterproof enclosure.
CaptainJohn49? ?
Mppt?charger maybe cheaper? On Thursday, September 3, 2020, 14:43, damonalane <dlane@...> wrote: I would go with the DC-DC converter as the simpler option, assuming you can buy one that steps down that far: 72V to 12V or 24V. That's how mine is setup, though my motor only needs 48V. I'm guessing with the proliferation of higher voltage motors that converters are available for those systems.
To use another solar controller, wouldn't you need another solar array? And to figure out how many watts of solar panels to give to each controller? With one controller you can put the solar where it works best. Let the controller control all of it, and let voltage flow "downhill" through the DC-DC converter.
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Re: Relationship of voltage to capacity
Bob is right. Even without electric propulsion, voltage isn't a good measure of state of charge. With the huge power draw of propulsion, the voltage will drop below values that would be alarm-worthy for a battery that had been resting for several hours. Of course we can't keep pulling that much current, but it's fine to do temporarily and the voltage will go back up when the power draw drops.
Battery monitors like the Victron know the voltage, but they also track amps in and out. They "count" the amount of energy leaving the battery regardless of the rate it's leaving to calculate state of charge. That is a major improvement over voltage alone, but the method only works well if the monitor knows the capacity of the battery. When the battery is new, the monitor will be pretty accurate, because you can program it with the battery's specifications. But as the battery ages and capacity declines, the monitor will be increasingly inaccurate. You could reprogram the battery's capacity in the monitor annually, but it's hard to know how much to decrease it by. The Balmar SG200 is supposed to address this problem, "learning" the battery's evolving capacity by watching various parameters over time. It uses the same kind of hardware as athe Victron, but apparently does more analysis on what it sees. In non-propulsion applications, people have been impressed, but I haven't seen any tests with the higher power draws we use. I've had one for about half a season and can't draw any conclusions yet.
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Re: Two voltage battery banks on one charger
I have used these the fan is a bit noisy But it¡¯s useful for various projects
On Saturday, September 5, 2020, 07:39:41 AM PDT, reesekc <kcr@...> wrote:
I've tried several of the ideas listed on this subject...? what has worked best for me: I presently have 2 x 100w solar panels connected in series to provide 24v plus. I use a "boost" mppt solar controller?(requires?a minimum of 15v input and provides about 54v max output) to charge my 48v battery bank. The solar is connected all-the-time. I then use a 48v to 12v DC to DC converter to provide boat power. When needed, I plug in a standard 48v Golf Cart Charger into either dock power or my 2k generator. On longer motoring periods, I found that I can hold 3.3 Knots continuously using the generator while still holding the existing battery charge. FYI... I have a Sloop rig 35.5 ft Hughes Sailboat.
They make 12v batt chargers that take 48v input.? I have one but haven't installed yet as I still have a separate panel and charge controller for 12v.? I want that real estate back though so I can use for another panel for 48v charging :-) On Sep 4, 2020, at 10:19 PM, Tommy rochester <troche289@...> wrote:
? Do you know what it's called so I can research it? Our maybe the name of the company?
How do I connect the generator to the charger. The charger I'm using will let me combine wind and solar and it will switch between automatically. I'm not using wind so I'm thinking I could tie in to that spot on the charger. But I need to convert the power from ac to dc for that to work. Honestly not sure of a really good way to do it.? There is a company in the UK that makes a generator starter when the battery voltage drops below 11.8v the gen set turns on and turns off at 12.8v or so.? All automatic.? I have one but never installed it. Cost was about $75 with a waterproof enclosure.
CaptainJohn49? ?
Mppt?charger maybe cheaper? On Thursday, September 3, 2020, 14:43, damonalane <dlane@...> wrote: I would go with the DC-DC converter as the simpler option, assuming you can buy one that steps down that far: 72V to 12V or 24V. That's how mine is setup, though my motor only needs 48V. I'm guessing with the proliferation of higher voltage motors that converters are available for those systems.
To use another solar controller, wouldn't you need another solar array? And to figure out how many watts of solar panels to give to each controller? With one controller you can put the solar where it works best. Let the controller control all of it, and let voltage flow "downhill" through the DC-DC converter.
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Re: Two voltage battery banks on one charger
Why bother connecting to the solar charger from your generator??
Just connect a proper charger right to the battery bank.?
If the generator come on due to low voltage obviously the solar charger is not providing enough voltage.
Ken
Sabre 28
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On Sep 5, 2020, at 10:52 AM, Peter Zephyr < Pcbeckett@...> wrote: Thanks for this explanation. ?Can you tell me the model of Boost controller ?? Rgds Peter On Sep 5, 2020, at 10:44 AM, reesekc <kcr@...> wrote:
? I've tried several of the ideas listed on this subject...? what has worked best for me: I presently have 2 x 100w solar panels connected in series to provide 24v plus. I use a "boost" mppt solar controller?(requires?a minimum of 15v input and provides about 54v max output) to charge my 48v battery bank. The solar is connected all-the-time. I then use a 48v to 12v DC to DC converter to provide boat power. When needed, I plug in a standard 48v Golf Cart Charger into either dock power or my 2k generator. On longer motoring periods, I found that I can hold 3.3 Knots continuously using the generator while still holding the existing battery charge. FYI... I have a Sloop rig 35.5 ft Hughes Sailboat. They make 12v batt chargers that take 48v input.? I have one but haven't installed yet as I still have a separate panel and charge controller for 12v.? I want that real estate back though so I can use for another panel for 48v charging :-) On Sep 4, 2020, at 10:19 PM, Tommy rochester <troche289@...> wrote:
? Do you know what it's called so I can research it? Our maybe the name of the company?
How do I connect the generator to the charger. The charger I'm using will let me combine wind and solar and it will switch between automatically. I'm not using wind so I'm thinking I could tie in to that spot on the charger. But I need to convert the power from ac to dc for that to work. Honestly not sure of a really good way to do it.? There is a company in the UK that makes a generator starter when the battery voltage drops below 11.8v the gen set turns on and turns off at 12.8v or so.? All automatic.? I have one but never installed it. Cost was about $75 with a waterproof enclosure.
CaptainJohn49? ?
Mppt?charger maybe cheaper? On Thursday, September 3, 2020, 14:43, damonalane <dlane@...> wrote: I would go with the DC-DC converter as the simpler option, assuming you can buy one that steps down that far: 72V to 12V or 24V. That's how mine is setup, though my motor only needs 48V. I'm guessing with the proliferation of higher voltage motors that converters are available for those systems.
To use another solar controller, wouldn't you need another solar array? And to figure out how many watts of solar panels to give to each controller? With one controller you can put the solar where it works best. Let the controller control all of it, and let voltage flow "downhill" through the DC-DC converter.
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Re: Two voltage battery banks on one charger
Thanks for this explanation. ?Can you tell me the model of Boost controller ?? Rgds Peter
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On Sep 5, 2020, at 10:44 AM, reesekc <kcr@...> wrote:
? I've tried several of the ideas listed on this subject...? what has worked best for me: I presently have 2 x 100w solar panels connected in series to provide 24v plus. I use a "boost" mppt solar controller?(requires?a minimum of 15v input and provides about 54v max output) to charge my 48v battery bank. The solar is connected all-the-time. I then use a 48v to 12v DC to DC converter to provide boat power. When needed, I plug in a standard 48v Golf Cart Charger into either dock power or my 2k generator. On longer motoring periods, I found that I can hold 3.3 Knots continuously using the generator while still holding the existing battery charge. FYI... I have a Sloop rig 35.5 ft Hughes Sailboat. They make 12v batt chargers that take 48v input.? I have one but haven't installed yet as I still have a separate panel and charge controller for 12v.? I want that real estate back though so I can use for another panel for 48v charging :-) On Sep 4, 2020, at 10:19 PM, Tommy rochester <troche289@...> wrote:
? Do you know what it's called so I can research it? Our maybe the name of the company?
How do I connect the generator to the charger. The charger I'm using will let me combine wind and solar and it will switch between automatically. I'm not using wind so I'm thinking I could tie in to that spot on the charger. But I need to convert the power from ac to dc for that to work. Honestly not sure of a really good way to do it.? There is a company in the UK that makes a generator starter when the battery voltage drops below 11.8v the gen set turns on and turns off at 12.8v or so.? All automatic.? I have one but never installed it. Cost was about $75 with a waterproof enclosure.
CaptainJohn49? ?
Mppt?charger maybe cheaper? On Thursday, September 3, 2020, 14:43, damonalane <dlane@...> wrote: I would go with the DC-DC converter as the simpler option, assuming you can buy one that steps down that far: 72V to 12V or 24V. That's how mine is setup, though my motor only needs 48V. I'm guessing with the proliferation of higher voltage motors that converters are available for those systems.
To use another solar controller, wouldn't you need another solar array? And to figure out how many watts of solar panels to give to each controller? With one controller you can put the solar where it works best. Let the controller control all of it, and let voltage flow "downhill" through the DC-DC converter.
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Re: Two voltage battery banks on one charger
I've tried several of the ideas listed on this subject...? what has worked best for me: I presently have 2 x 100w solar panels connected in series to provide 24v plus. I use a "boost" mppt solar controller?(requires?a minimum of 15v input and provides about 54v max output) to charge my 48v battery bank. The solar is connected all-the-time. I then use a 48v to 12v DC to DC converter to provide boat power. When needed, I plug in a standard 48v Golf Cart Charger into either dock power or my 2k generator. On longer motoring periods, I found that I can hold 3.3 Knots continuously using the generator while still holding the existing battery charge. FYI... I have a Sloop rig 35.5 ft Hughes Sailboat.
They make 12v batt chargers that take 48v input.? I have one but haven't installed yet as I still have a separate panel and charge controller for 12v.? I want that real estate back though so I can use for another panel for 48v charging :-) On Sep 4, 2020, at 10:19 PM, Tommy rochester <troche289@...> wrote:
? Do you know what it's called so I can research it? Our maybe the name of the company?
How do I connect the generator to the charger. The charger I'm using will let me combine wind and solar and it will switch between automatically. I'm not using wind so I'm thinking I could tie in to that spot on the charger. But I need to convert the power from ac to dc for that to work. Honestly not sure of a really good way to do it.? There is a company in the UK that makes a generator starter when the battery voltage drops below 11.8v the gen set turns on and turns off at 12.8v or so.? All automatic.? I have one but never installed it. Cost was about $75 with a waterproof enclosure.
CaptainJohn49? ?
Mppt?charger maybe cheaper? On Thursday, September 3, 2020, 14:43, damonalane <dlane@...> wrote: I would go with the DC-DC converter as the simpler option, assuming you can buy one that steps down that far: 72V to 12V or 24V. That's how mine is setup, though my motor only needs 48V. I'm guessing with the proliferation of higher voltage motors that converters are available for those systems.
To use another solar controller, wouldn't you need another solar array? And to figure out how many watts of solar panels to give to each controller? With one controller you can put the solar where it works best. Let the controller control all of it, and let voltage flow "downhill" through the DC-DC converter.
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Re: Two voltage battery banks on one charger
They make 12v batt chargers that take 48v input. ?I have one but haven't installed yet as I still have a separate panel and charge controller for 12v. ?I want that real estate back though so I can use for another panel for 48v charging :-)
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On Sep 4, 2020, at 10:19 PM, Tommy rochester <troche289@...> wrote:
? Do you know what it's called so I can research it? Our maybe the name of the company?
How do I connect the generator to the charger. The charger I'm using will let me combine wind and solar and it will switch between automatically. I'm not using wind so I'm thinking I could tie in to that spot on the charger. But I need to convert the power from ac to dc for that to work. Honestly not sure of a really good way to do it.? There is a company in the UK that makes a generator starter when the battery voltage drops below 11.8v the gen set turns on and turns off at 12.8v or so.? All automatic.? I have one but never installed it. Cost was about $75 with a waterproof enclosure.
CaptainJohn49? ?
Mppt?charger maybe cheaper? On Thursday, September 3, 2020, 14:43, damonalane <dlane@...> wrote: I would go with the DC-DC converter as the simpler option, assuming you can buy one that steps down that far: 72V to 12V or 24V. That's how mine is setup, though my motor only needs 48V. I'm guessing with the proliferation of higher voltage motors that converters are available for those systems.
To use another solar controller, wouldn't you need another solar array? And to figure out how many watts of solar panels to give to each controller? With one controller you can put the solar where it works best. Let the controller control all of it, and let voltage flow "downhill" through the DC-DC converter.
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Re: Two voltage battery banks on one charger
Do you know what it's called so I can research it? Our maybe the name of the company?
How do I connect the generator to the charger. The charger I'm using will let me combine wind and solar and it will switch between automatically. I'm not using wind so I'm thinking I could tie in to that spot on the charger. But I need to convert the power from ac to dc for that to work. Honestly not sure of a really good way to do it.?
There is a company in the UK that makes a generator starter when the battery voltage drops below 11.8v the gen set turns on and turns off at 12.8v or so.? All automatic.? I have one but never installed it. Cost was about $75 with a waterproof enclosure.
CaptainJohn49? ?
Mppt?charger maybe cheaper? On Thursday, September 3, 2020, 14:43, damonalane <dlane@...> wrote: I would go with the DC-DC converter as the simpler option, assuming you can buy one that steps down that far: 72V to 12V or 24V. That's how mine is setup, though my motor only needs 48V. I'm guessing with the proliferation of higher voltage motors that converters are available for those systems.
To use another solar controller, wouldn't you need another solar array? And to figure out how many watts of solar panels to give to each controller? With one controller you can put the solar where it works best. Let the controller control all of it, and let voltage flow "downhill" through the DC-DC converter.
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Re: Two voltage battery banks on one charger
There is a company in the UK that makes a generator starter when the battery voltage drops below 11.8v the gen set turns on and turns off at 12.8v or so. ?All automatic. ?I have one but never installed it. Cost was about $75 with a waterproof enclosure.
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On Sep 3, 2020, at 16:00, sw via groups.io <v1opps@...> wrote:
?
Mppt?charger maybe cheaper? On Thursday, September 3, 2020, 14:43, damonalane <dlane@...> wrote: I would go with the DC-DC converter as the simpler option, assuming you can buy one that steps down that far: 72V to 12V or 24V. That's how mine is setup, though my motor only needs 48V. I'm guessing with the proliferation of higher voltage motors that converters are available for those systems.
To use another solar controller, wouldn't you need another solar array? And to figure out how many watts of solar panels to give to each controller? With one controller you can put the solar where it works best. Let the controller control all of it, and let voltage flow "downhill" through the DC-DC converter.
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Re: Two voltage battery banks on one charger
With the solar charge them in series Peter.?
I assume your 48 Volt pack is made up of four 12volt batteries in series. Do you charge them in series i.e at 48 volts+ or do you charge each 12 volt battery separately? ? If separately do you connect them all to the same controller and charge them at the same time ? Rgds? Peter Beckett ? ? FWIW, I have a separate 48 volt propulsion bank & 12 volt house bank. I charge both banks with 260 watts of 24 volt panels wired in series using a midnight kid solar controller.? I wired the controller output to a double pole double throw transfer switch. I can pick which bank I'd like to charge & easily adjust the parameters.?? ? I like the mppt charger because they usually have adjustable voltage and amperage tsp can use for many battery types On Friday, September 4, 2020, 11:55:16 AM PDT, Damon Lane <dlane@...> wrote: DC-DC converters are simple: they produce the lower voltage from the higher voltage, and supply current up to their max rated power throughput.?
On my boat, I have no lower voltage batteries, so if the propulsion bank or DC-DC converter had a problem, I'd have no 12V. That is a problem, and I'm realizing that if I did have batteries at 12V, the DC-DC converter probably wouldn't charge them because the voltage it supplies is too low (13.1V) and it's not a charger.?
So I'll amend my initial comment and say DC-DC converters are simpler if you don't plan to have separate battery banks at different voltages. If you do, I think you do need two chargers. Setting up two chargers and a generator is surely possible, but you may want to consult a book or specialist. I think the generator could be set to trip on at low voltage, but would you want it to if it would come on each morning at dawn, only to charge for a few minutes before the solar would have come on anyway? I would want more complex controls.
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Re: Relationship of voltage to capacity
Can't go by voltage unless the bank has been resting. A battery monitor like a Victron 700 is a better option.?
On Fri, Sep 4, 2020, 4:03 PM Ryan Sweet < ryan@...> wrote: 48v battery bank of 4s 12v AGM. When ¡°full¡± according to the charger the voltage is around 52.8,?
I have a battery capacity monitor that wants to be set to 48v, lead acid, and it wants a voltage level to use for a warning threshold.
So the question is, what voltage should I consider to be ¡°50%¡± and thus the floor of my safe discharge?
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Relationship of voltage to capacity
48v battery bank of 4s 12v AGM. When ¡°full¡± according to the charger the voltage is around 52.8,
I have a battery capacity monitor that wants to be set to 48v, lead acid, and it wants a voltage level to use for a warning threshold.
So the question is, what voltage should I consider to be ¡°50%¡± and thus the floor of my safe discharge?
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Re: Two voltage battery banks on one charger
I assume your 48 Volt pack is made up of four 12volt batteries in series. Do you charge them in series i.e at 48 volts+ or do you charge each 12 volt battery separately? ? If separately do you connect them all to the same controller and charge them at the same time ? Rgds? Peter Beckett ?
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From: [email protected] < [email protected]> On Behalf Of Bob Jennings Sent: Friday, September 4, 2020 3:47 PM To: [email protected]Subject: Re: [electricboats] Two voltage battery banks on one charger ? FWIW, I have a separate 48 volt propulsion bank & 12 volt house bank. I charge both banks with 260 watts of 24 volt panels wired in series using a midnight kid solar controller.? I wired the controller output to a double pole double throw transfer switch. I can pick which bank I'd like to charge & easily adjust the parameters.?? ? I like the mppt charger because they usually have adjustable voltage and amperage tsp can use for many battery types On Friday, September 4, 2020, 11:55:16 AM PDT, Damon Lane <dlane@...> wrote: DC-DC converters are simple: they produce the lower voltage from the higher voltage, and supply current up to their max rated power throughput.?
On my boat, I have no lower voltage batteries, so if the propulsion bank or DC-DC converter had a problem, I'd have no 12V. That is a problem, and I'm realizing that if I did have batteries at 12V, the DC-DC converter probably wouldn't charge them because the voltage it supplies is too low (13.1V) and it's not a charger.?
So I'll amend my initial comment and say DC-DC converters are simpler if you don't plan to have separate battery banks at different voltages. If you do, I think you do need two chargers. Setting up two chargers and a generator is surely possible, but you may want to consult a book or specialist. I think the generator could be set to trip on at low voltage, but would you want it to if it would come on each morning at dawn, only to charge for a few minutes before the solar would have come on anyway? I would want more complex controls.
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Re: Two voltage battery banks on one charger
FWIW, I have a separate 48 volt propulsion bank & 12 volt house bank. I charge both banks with 260 watts of 24 volt panels wired in series using a midnight kid solar controller.? I wired the controller output to a double pole double throw transfer switch. I can pick which bank I'd like to charge & easily adjust the parameters.??
I like the mppt charger because they usually have adjustable voltage and amperage tsp can use for many battery types
On Friday, September 4, 2020, 11:55:16 AM PDT, Damon Lane < dlane@...> wrote:
DC-DC converters are simple: they produce the lower voltage from the higher voltage, and supply current up to their max rated power throughput.?
On my boat, I have no lower voltage batteries, so if the propulsion bank or DC-DC converter had a problem, I'd have no 12V. That is a problem, and I'm realizing that if I did have batteries at 12V, the DC-DC converter probably wouldn't charge them because the voltage it supplies is too low (13.1V) and it's not a charger.?
So I'll amend my initial comment and say DC-DC converters are simpler if you don't plan to have separate battery banks at different voltages. If you do, I think you do need two chargers. Setting up two chargers and a generator is surely possible, but you may want to consult a book or specialist. I think the generator could be set to trip on at low voltage, but would you want it to if it would come on each morning at dawn, only to charge for a few minutes before the solar would have come on anyway? I would want more complex controls.
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Re: Two voltage battery banks on one charger
I like the mppt charger because they usually have adjustable voltage and amperage tsp can use for many battery types
On Friday, September 4, 2020, 11:55:16 AM PDT, Damon Lane <dlane@...> wrote:
DC-DC converters are simple: they produce the lower voltage from the higher voltage, and supply current up to their max rated power throughput.?
On my boat, I have no lower voltage batteries, so if the propulsion bank or DC-DC converter had a problem, I'd have no 12V. That is a problem, and I'm realizing that if I did have batteries at 12V, the DC-DC converter probably wouldn't charge them because the voltage it supplies is too low (13.1V) and it's not a charger.?
So I'll amend my initial comment and say DC-DC converters are simpler if you don't plan to have separate battery banks at different voltages. If you do, I think you do need two chargers. Setting up two chargers and a generator is surely possible, but you may want to consult a book or specialist. I think the generator could be set to trip on at low voltage, but would you want it to if it would come on each morning at dawn, only to charge for a few minutes before the solar would have come on anyway? I would want more complex controls.
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Re: Two voltage battery banks on one charger
DC-DC converters are simple: they produce the lower voltage from the higher voltage, and supply current up to their max rated power throughput.?
On my boat, I have no lower voltage batteries, so if the propulsion bank or DC-DC converter had a problem, I'd have no 12V. That is a problem, and I'm realizing that if I did have batteries at 12V, the DC-DC converter probably wouldn't charge them because the voltage it supplies is too low (13.1V) and it's not a charger.?
So I'll amend my initial comment and say DC-DC converters are simpler if you don't plan to have separate battery banks at different voltages. If you do, I think you do need two chargers. Setting up two chargers and a generator is surely possible, but you may want to consult a book or specialist. I think the generator could be set to trip on at low voltage, but would you want it to if it would come on each morning at dawn, only to charge for a few minutes before the solar would have come on anyway? I would want more complex controls.
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Re: Supplementary electric power for heavy old sailing boat
I just took a look in my engine room and I do think I could possibly mount the motor directly onto the transmission.? Orest, would you be willing to post a photo of your arrangement?? I'd be most interested to see just where you bolted the mounting bracket.??
Also, I was looking at Goodyear toothed power transmission belts.? There are many different types!? Do you recall just what kind you are using?
It's interesting that you are experiencing heat problems.? Is it when you're running or is it when regenerating that you're developing heat?? Do you think a liquid cooled motor might be in order for this application perhaps?? Do you often run in the 10kw range or are you getting hot at lower power also?
Thanks,
Matthew
Dexter, Michigan
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Re: Supplementary electric power for heavy old sailing boat
I was intending not to have to install any kind of clutch.? My thinking is that I could allow the diesel to drive the motor as a generator until the batteries were charged and then the motor would effectively go offload and freewheel and provide very little parasitic load (Im thinking of using a?48V Sevcon Gen-4 which supports regeneration).?
The Perkins 236 has ample power to drive the boat and the generator.? As it is, the diesel is driving a 170 amp Baldor alternator which I could probably remove and sell and replace with a standard 35amp alternator as it would be relegated to only charging the diesel starter batteries.
Orest, I was thinking of using something like the cogged belt that you suggest.? I'll look into the Goodyear option. Thanks.? I can see that by using a cogged belt the required tension is much less critical and so the side load on the bearings should be less.? I like the idea of mounting directly to the transmission.? I don't know if I have enough room for that.? I'll need to check.? I was thinking of glassing in a mounting pad directly to the hull and mounting the motor onto that via a hinge, similar to an alternator on an engine.
If you get a taker for the transmission?case idea, I could be interested but my budget for the whole project is under US$5k so I imagine that would be out of my reach.
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Re: Supplementary electric power for heavy old sailing boat
That's an interesting idea Darryl but I don't think I'd be able to fit something like that in my case.
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Re: Two voltage battery banks on one charger
I found a 72v to 24v converter on an ev automotive sight. It charges at 50 amps. I don't know much more than that about it. Is there anything else I should be aware of?
On Thu, Sep 3, 2020, 6:12 PM Tommy rochester via <troche289= [email protected]> wrote: Well as far as another mppt controller, I was thinking they take higher voltage in and put out the voltage you need for the battery bank. I was going to feed it with the 72v bank so I would only need one array. My thinking was to have better control of charging the house bank. You are right,? the converter will be easier.? Overall you think I'm on the right track??
My next question is how do I integrate my genset into the system. Ideally I would like to have our turn on automatically at a low voltage set point. I've seen something similar on big semis. Mainly with refrigeration to maintain temperature.?
I know I could rig it through a couple of relays once the voltage would drop to a certain point the relay would open and the normally open contacts would then close to start the genset.?
What I haven't figured out is how to switch between the genset and the charge controller. I may be overthinking it a bit, but automation is my goal if possible.?
On Thu, Sep 3, 2020, 5:43 PM damonalane < dlane@...> wrote: I would go with the DC-DC converter as the simpler option, assuming you can buy one that steps down that far: 72V to 12V or 24V. That's how mine is setup, though my motor only needs 48V. I'm guessing with the proliferation of higher voltage motors that converters are available for those systems.
To use another solar controller, wouldn't you need another solar array? And to figure out how many watts of solar panels to give to each controller? With one controller you can put the solar where it works best. Let the controller control all of it, and let voltage flow "downhill" through the DC-DC converter.
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CaptainJohn49