Why do battery needs a float current?
I mean, when it's full, floating and there are no loads? To fight the self-discharge, alright. But it draws a bit more than self-discharge would require. I have 300 AH AGM bank, self-discharge ...
Forum Discussion
Almot wrote:
5% controller loss is nothing compared to 7-fold "overhead" that Im seeing (2AH/0.3AH=7).
I think you are confusing two different things. It looks like the .3A is the Amps (instantaneous) into the batteries. 2Ah is the total for the day. (.3*6.7 hrs = 2Ah).
Any current in excess of what is needed to charge or make up for self discharge of the battery has to be dissipated in some way. Since you are running current through a resistor (battery), some is lost to heat and some also to electrolysis. 2 Ah a day isn’t that much. Looking back at my data log, mine averages 4 to 5 Ah per day. That is with all parasitic loads disconnected (4 GC2s).
