I recently replaced the house bank with 2 100ah LiTime mini units. I have a 2 outboard setup with 2 Blue Seas ACR, one for each engine. I also have 200w solar with a Victron MPPT 75/15 controller. There is also a Prosine 2.0 inverter/charger. I have removed the house bank from the ACR's, installed a DC_DC charger and fed it from one of the 2 AGM start batteries. The solar is now charging the house bank only. The Prosine algorithm has been adjusted. My conundrum is off season. I live in Maine so winters are harsh. I plan on removing the house bank and storing them. I have always left the AGMs and the solar kept them charged even through the shrink wrap. So my question is can I use a solid state relay controlled by a switch labelled summer/winter the result of which would allow both AGM start batteries to be solar charged during the winter and in the season would revert to original configuration. Is voltage drop an issue if using solid state?
Summer/winter scheme
- Thread starter Old Salt
- Start date
I would use a mechanical switch and not an SSR. But I think an SSR would work. You are going through the effort of removing the LFP, so having the switch in an inconvenient place probably isn't a big deal, thus no need for an SSR. Check the specs on the SSR, but voltage drop shouldn't be an issue. It should be none, or very small.
hwy17
Anti-Solar Enthusiast
How about a Blue Sea 1-2-BOTH switch?
Or just a disconnect?
I don't quite understand the intended design, but I don't hear yet why a manual switch wouldn't work just as well.
Or just a disconnect?
I don't quite understand the intended design, but I don't hear yet why a manual switch wouldn't work just as well.
Suijkerbuijk
I cannot be held responsible for this information.
I had the same problem like you .
2 lead battery one for the start the engine and one for the navigation lights and the radar , marifoon and plotter.
And had only 1 Victron 75/15 unit
The big battery are lipo4 and have own solar chargers and are use for the kitchen and living room.
So i have switch from a mppt to a dual pwm controller wilt a 25 watt solar panel .
Special for the lead battery.
Its 24/7 connect and function like small drip charger (0.5 amp charge to 1e battery and 0.5amp to the 2e battery in the winter (summer it go up to 1amp )
I use a victron BlueSolar PWM DUO-LCD&USB
And bonus it can in the future charge
LifePO4-accu's (with internel BMS).
You can adjust the setting for it.
2 lead battery one for the start the engine and one for the navigation lights and the radar , marifoon and plotter.
And had only 1 Victron 75/15 unit
The big battery are lipo4 and have own solar chargers and are use for the kitchen and living room.
So i have switch from a mppt to a dual pwm controller wilt a 25 watt solar panel .
Special for the lead battery.
Its 24/7 connect and function like small drip charger (0.5 amp charge to 1e battery and 0.5amp to the 2e battery in the winter (summer it go up to 1amp )
I use a victron BlueSolar PWM DUO-LCD&USB
And bonus it can in the future charge
LifePO4-accu's (with internel BMS).
You can adjust the setting for it.
Sorry for being slow to respond--life gets in the way sometimes. I think a DPDT switch is the way to go. I'm new to lithium batteries so my understanding is that they should not freeze or charge below manufacturer's specifications. After preparing for the changeover I think I was still in complicated install mode when I thought about it. BTW my 2 Group 27 AGMs weighed out at 146# and netted me $20 at the scrap yard so pulling 20# ea. will be nice! My grandson just got into electric rc planes and lithium batteries used in them are prone to catching fire.
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