Still Don't Get It (Solar)
What will charge 2 6v golf cart batteries better, a single 270 watt high voltage panel with mppt or two 135 watt 12v panels (parallel) with PWM and why???? Thanks. Gman
Forum Discussion
BFL13 wrote:
I have done it both ways now and can compare them in the same location and time of year on the same batteries.
It is the amps that charge the battery and they both do similar amps. You can set the same absorption voltage.
The charge controllers may have the same or different charging profiles but either or both could be suitable for the 6s.
The only difference for the batteries is that one set-up may get a few more amp hours in during the daylight available that day. Hit and miss on that. Sometimes the MPPT high wattage panel could do better and sometimes, such as when panel temperature is high, the PWM can do more amps and so AH.
They both work well so which to choose should be based on other things like panel size/roof clear spot areas, cost, perhaps wiring if that matters.
For portables, I have learned it is easier to lug around two 12v panels one at a time than one big 24v panel and to find places to carry them in the trailer when travelling. This is of no concern for roof installations.
I'd follow BLF13's advice. He has done a lot of definitive experimenting and real world research.
