mppt vs pwm

jrnymn7 wrote:
"Otherwise it's Imp and Vmp (maximum power) for MPPT for either series or parallel panels."

Thanks, yes, now I recall BFL explaining that.

So, in that case, the comparison being discussed is 12v in series (34v) vs. 24v in parallel (36v), using mppt. But if it's all about wattage, why is there 20% less output when using 12v panels in series? Are some of the watts not usable?

Not following closely, am camping with limited data plan.

I suspect there could be something in the IV curves for each panel type. Some 12s, usually monos, have higher Voc and lower Isc than others, mostly poly, which may affect their Vmp as a combo?

I don't know if the 24v panels have this variety. Need how their Vmps could be compared with whatever the 12s have for the same wattage of panel. I don't know, ask Ken if he ever gets back here :)