12v MPPT and 24v MPPT vs 24v PWM Test
Got a chance to try out comparing amps to the battery using MPPT vs PWM on a 24v battery bank and comparing those with the usual MPPT on 12v with my 230w panel. The bank is four 6s, so it was easy ...
Forum Discussion
"So I don't see how Voc would help to determine how it will charge a battery."
As I understand it,
1) Voc is always > Vmp. I can see low light conditions causing Vmp to approach Voc. However, at no time can an mppt controller charge, using Voc; as that would reduce current down to zero amps.
2) PWM controllers (edit: use up to and including Voc, in low light conditions), which is maximum panel voltage at that moment, in those particular conditions. And provided it meets Kirchoff's voltage law, charging will commence.
As I understand it,
1) Voc is always > Vmp. I can see low light conditions causing Vmp to approach Voc. However, at no time can an mppt controller charge, using Voc; as that would reduce current down to zero amps.
2) PWM controllers (edit: use up to and including Voc, in low light conditions), which is maximum panel voltage at that moment, in those particular conditions. And provided it meets Kirchoff's voltage law, charging will commence.
