Posted January 11, 20232 yr Hi guys, I have a victron mppt 75|50 blue solar charger, with a 500w solar panel that was charging a set of 3 100ah deep cycle batteries. the system was working just fine bu t the batteries were just getting old and i decided to replace them with a lithium 100ah battery. I changed the victron mppt battery setting to the lithium setting and when i connected the battery it's voltage was at 13.9v (this was at night when there was no solar generation) through the night a couple of devices were on, on the inverter and the battery depleted to to 10.8v. this morning when the sun came out if was expecting the mppt to charge the battery but it just stays at 10.8v. after doing some googling I think the bms must have shut itself down to protect it from completley draining but trying to figure out how to get it going again. from what I read, i have to supply the lithium batter with 12v power either with another battery or maybe something as simple as a car charger. will this make the battery charge from the mppt again. Or is it that the mppt will not start charging until it detects 12v on the battery end... and because the battery is at 10.8v it does not see this and wont charge the battery? if this is the case, then can i could the lithium battery in parallel with the old deep cylce battery just to register 12v and then the charger will charge?
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