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The volt difference between 100% and 80% is like 0.3V. Using that to determine charge voltage is just not viable, any load on the system will cause the volt to not align with the desired SOC value. Or am I misunderstanding something?

I accidentally let them discharge to zero twice. When I did not disconnect the inverter over winter. Snow covered the solar panels over winter and after a few weeks with 0w solar the old batteries were completely drained. AGM should be able to sort of handle that but it is not good for them. I...

So I have a off grid summer house with: solar on the roof - about 1000w (I get maybe 650w on a normal day due to location ) Victron SmartSolar MPPT 100/50 24v 1200VA phoenix inverter A new LiTime 24v 100Ah 2.5kW lifepo4 battery Historically I had two 12v lead acid batteries in series. But they...