07-10-2018, 06:01 PM
I have a 12 volt solar system with 12v controller which smart charges its 12v battery . It controls max / min voltages and as I understand things, voltage indicates battery state. BUT its 12 volt (it can be set for 24 v). However if you have 2 x 6 v batteries in series. they must be used in conjunction with each other. A simple step down of voltage wouldn't work as a trickle charger.