mppt vs pwm
Hi, A nice little video comparing mppt vs pwm with the batteries in bulk mode. mppt vs pwm
Forum Discussion
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?
24 V in parallel is 28 to 30V, not 36V.
With a 12V panel, you end up with 14.4 to 14.8V in bulk mode, out of 17.0V for the panel under full load, about 21 to 22 V open circuit.
With 24V panel, you end up 28 to 30 V Open circuit... check the panel specifications for Voc and Imp as well as Vmp... the ratio of the loss is less Voc to Vmp in a 24 volt system.
