Uni axis currently tilted manually. Wish I knew of a durable reliable automatic tracker but everything I see online seems like it won’t hold up to Ocean cruising environment. Do you know of one? I was just introduced to the Victron smart Cyrix. It seems like the answer? Thank you for your calcs and assistance! Let me know what you think.

On Thu, Mar 5, 2020 at 9:10 AM Kevin Pemberton <pembertonkevin@...> wrote:

Your post raises more questions.?

Do the panels follow the sun?... my panels when flat produce 1/4 the power.? At best 4/5ths of rated power.?

Just because the voltage is up mid day tells you nothing. When you turn the panel switch off what is the battery bank reading?

The last 20% of a lead acid bank can take more than ten hours.

800w motor, 1000w panel. 2hrs at 800w=1600w. Real numbers on the array bet more like 300w if flat.?

Check the numbers for your installation.?

If dink is high priority, consider splitting the array and dedicating some to the dink. Or add panels to the dink.?

Kevin

On Wed, Mar 4, 2020, 8:42 AM mosslandingcreatures <mosslandingcreatures@...> wrote:

My first time on this wonderful info site. I thought my project would be easy. Mothership sailboat has 1k solar power with a 3k Victron inverter Charger powering the usual refer, autopilot, dc water maker and the like. House bank is 800 Ah. She has a Honda 2000 generator but I would dearly want not have to use it. With typical use and southern California/Mexico daylight and uniaxis pv tilt I hit float usually by mid day or so. I want my house bank to never dip below 50% DOD. I want componentry to see the house floating and send remaining power to a separate dedicated inverter??? To power the 120 v charger to drive 200 Ah lithium battery onboard the ding?... Echo charger relay??? I want rapid as possible charging of the dingy battery so I might use the 800 watt dingy motor for 2 hours every day. Any ideas ladies and gentlemen??

Your post raises more questions.?

Do the panels follow the sun?... my panels when flat produce 1/4 the power.? At best 4/5ths of rated power.?

Just because the voltage is up mid day tells you nothing. When you turn the panel switch off what is the battery bank reading?

The last 20% of a lead acid bank can take more than ten hours.

800w motor, 1000w panel. 2hrs at 800w=1600w. Real numbers on the array bet more like 300w if flat.?

Check the numbers for your installation.?

If dink is high priority, consider splitting the array and dedicating some to the dink. Or add panels to the dink.?

Kevin

On Wed, Mar 4, 2020, 8:42 AM mosslandingcreatures <mosslandingcreatures@...> wrote:

My first time on this wonderful info site. I thought my project would be easy. Mothership sailboat has 1k solar power with a 3k Victron inverter Charger powering the usual refer, autopilot, dc water maker and the like. House bank is 800 Ah. She has a Honda 2000 generator but I would dearly want not have to use it. With typical use and southern California/Mexico daylight and uniaxis pv tilt I hit float usually by mid day or so. I want my house bank to never dip below 50% DOD. I want componentry to see the house floating and send remaining power to a separate dedicated inverter??? To power the 120 v charger to drive 200 Ah lithium battery onboard the ding?... Echo charger relay??? I want rapid as possible charging of the dingy battery so I might use the 800 watt dingy motor for 2 hours every day. Any ideas ladies and gentlemen??

My first time on this wonderful info site. I thought my project would be easy. Mothership sailboat has 1k solar power with a 3k Victron inverter Charger powering the usual refer, autopilot, dc water maker and the like. House bank is 800 Ah. She has a Honda 2000 generator but I would dearly want not have to use it. With typical use and southern California/Mexico daylight and uniaxis pv tilt I hit float usually by mid day or so. I want my house bank to never dip below 50% DOD. I want componentry to see the house floating and send remaining power to a separate dedicated inverter??? To power the 120 v charger to drive 200 Ah lithium battery onboard the ding?... Echo charger relay??? I want rapid as possible charging of the dingy battery so I might use the 800 watt dingy motor for 2 hours every day. Any ideas ladies and gentlemen??

Victron allows you to divert power to other sources once batteries are full.. a common use is to make more/hotter water for domestic use, but I don’t see why you couldn’t divert to another charger instead.

Sadly.. that’s the sharp end of my knowledge. … I’ve seen it implementd but don’t know how it was.

-Rob

On Mar 4, 2020, at 5:41 AM, mosslandingcreatures <mosslandingcreatures@...> wrote:

My first time on this wonderful info site. I thought my project would be easy. Mothership sailboat has 1k solar power with a 3k Victron inverter Charger powering the usual refer, autopilot, dc water maker and the like. House bank is 800 Ah. She has a Honda 2000 generator but I would dearly want not have to use it. With typical use and southern California/Mexico daylight and uniaxis pv tilt I hit float usually by mid day or so. I want my house bank to never dip below 50% DOD. I want componentry to see the house floating and send remaining power to a separate dedicated inverter??? To power the 120 v charger to drive 200 Ah lithium battery onboard the ding?... Echo charger relay??? I want rapid as possible charging of the dingy battery so I might use the 800 watt dingy motor for 2 hours every day. Any ideas ladies and gentlemen??

I bought a 20Ah electric bike battery to test using with my Torqeedo.? Obviously, I'll only be able to run the Torqeedo at very, very low speeds - but first would like to figure out what kind of plug mates to the power cord, so that I can minimize the connections as much as possible.

On Tuesday, March 3, 2020, 09:27:50 PM CST, Graeme Ross <graemealross@...> wrote:

I have a 4r? not sure what you mean by plugs. Do you mean the battery connection?? ? Graeme

On Tue, Mar 3, 2020 at 10:20 PM john via Groups.Io <oak_box=[email protected]> wrote:

Does anyone have any idea how I could find out what plugs come on the Torqeedo 2R and 4R motors?

Thanks!

John

I bought a 20Ah electric bike battery to test using with my Torqeedo.? Obviously, I'll only be able to run the Torqeedo at very, very low speeds - but first would like to figure out what kind of plug mates to the power cord, so that I can minimize the connections as much as possible.

On Tuesday, March 3, 2020, 09:27:50 PM CST, Graeme Ross <graemealross@...> wrote:

I have a 4r? not sure what you mean by plugs. Do you mean the battery connection?? ? Graeme

On Tue, Mar 3, 2020 at 10:20 PM john via Groups.Io <oak_box=[email protected]> wrote:

Does anyone have any idea how I could find out what plugs come on the Torqeedo 2R and 4R motors?

Thanks!

John

Does anyone have any idea how I could find out what plugs come on the Torqeedo 2R and 4R motors?

Thanks!

John

It may be useful to everyone to know if you've ever experienced your LiFePO4 batteries becoming too warm while charging or while they were under load.

Frankly, I've begun to wonder if the demands of any kind of boating activity on a battery bank would ever push or pull enough amps to raise the temperature of the typical LiFePO4 pack into a hazardous range.
However, if you've had this experience, I would ask that you reply to this message and please describe your setup and conditions for us.

One might say, for instance, you use 100Ah prismatic battery cells in a 16S1P configuration, bound with end-plates and held in a heavy plastic box with lid, and you were {charging|discharging} at a rate of approximately {__ Amps}.? Batteries were measured with a {________} at a temperature of {_______}.

This won't be a statistically a meaningful survey, of course, but if anyone *has* had an overheating experience, it could make for safer boating for everyone if the rest of us were to know the particulars.

Thanks so much!

[-tv]
Tom VanderMeulen
"Grace O'Malley"
Cape Dory 27, #257
Monroe, MI

You don't dunk an AGM "without consequence". Depending on the conductivity of the water and the charge on the battery, you are pulling the hydrogen out of the water and the chlorine out of the salt. Not too big a deal in an open boat, very bad in an enclosed space like an overturned catamaran. That's why you want to prevent all batteries from being immersed.

I see that the LTO cells have a nominal cell voltage of 2.3V, which is quite different than the 3.2V nominal voltage for LiFePO4 cells. That means you might have a hard time finding off-the-shelf charge controllers and BMSs that will work with these cells. I guess fully programmable units could be made to work, but IMO there's something reassuring about having the electronics that touch your battery cells just work when you apply power. No programming, no bootstrapping, less stress.

But if you can source suitable electronics, then maybe they are great. Does the manufacturer provide any recommendations for BMS and charge controllers?

Curtis