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
BFL13 wrote:Nope wasn't trying to do that at all, just no forgiveness for semantics and typos. :SCA Traveler wrote:jrnymn7 wrote:I'll bite - open circuit means no current.
True. But I thought pwm doesn't concern itself with Vmp. Wouldn't it be the panel's Voc that would matter, or am I mistaken about that?
My panels show 0A at Voc for all levels of radiation. Amps are a very steep dropoff beyond the knee on the IR curves.
You are still having fun with the semantics trying to get a rise out of us, only now you have switched to volts instead of amps. Won't work! :)
Better stated: The IV curves for my panels show that all for all levels of radiation the amps are 0A for Voc. So I don't see how Voc would help to determine how it will charge a battery.
In fact the main reasons for checking Voc are:
1. Don't exceed the controllers rating
2. Voc and Isc can be easily measured to determine a basic panel test.
