Solar Panel Voc-MPPT?
Wondering if there is any relationship between measured Voc and MPPT performance with a 24v panel. My 12v panel has a Voc rating of 21.9 and Isc of 8.2, but I often see 8.2ish when Voc is only 20....
Forum Discussion
Salvo wrote:
Check this out. Some real data.
https://www.rv.net/forum/index.cfm/fuseaction/thread/tid/25291818/srt/pa/pging/1/page/2.cfm
MPPT gains over pwm are in the 8% region when battery is held between 12.0 and 12.4V. What do you think the gain becomes when battery is at 13.0V?
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Sal
That is my big question. I know I keep getting the amps with PWM, but I don't know if I will with MPPT if say Voc is low but Isc is still ok. (or other factors that come into play with MPPT using power instead of amps, allowing voltage to now matter)
I agree it is not possible to define one answer for many different situations, so I will just have to find out what I get in my own situation.
Also I keep seeing MPPT guys using Imp with their comparisons with PWM, which makes PWM look worse than it is. ( you get the higher amp Isc, not Imp with PWM)
Kind of a tortoise and hare situation with MPPT being the hare?
