The best photovoltaic solar panels
Thought I would share some information on what are rated as the best/most efficient panels available. Sanyo HIT Power N Series. The cells are hybrids of monocrystalline silicone, surrounded by ultr...
Forum Discussion
For the same watts you can have high V and low A or low V and high A. Same watts. So it means nothing which way you go?
I get that the MPPT finds Vmp and the amps you happen to get at Vmp is Imp. Then they multiply those two and get the panel watts rating.
But with PWM 12v panels you get Isc for expected max amps, so which ever equal watt rating panel has the highest Isc is the one to get.
But with 24v you guys are saying that once the MPPT controller finds the Vmp, panel amps don't matter for anything, just the watts. But the watts rating is a sort of phony number invented by what amps you happen to get at Vmp.
I can sort of see that if you drop the voltage in half from 24 to 12, that amps would double, which is why 24v panels have half the amps of a 12v panel. MPPT outputs 12v from a 24v panel. It doesn't quite work out that neatly for doubling, but sort of.
But we have an example of a 36v panel vs a 39v panel and of course the rating faked up number 220w means there are more amps in the 220w for the 36v panel. How does that have anything to do with amps doubling going from 24v to 12v?
I think I could get this if I got hit on the head a few times with a 2 x 4, but maybe you guys could give it another try here first.
Thanks.
I get that the MPPT finds Vmp and the amps you happen to get at Vmp is Imp. Then they multiply those two and get the panel watts rating.
But with PWM 12v panels you get Isc for expected max amps, so which ever equal watt rating panel has the highest Isc is the one to get.
But with 24v you guys are saying that once the MPPT controller finds the Vmp, panel amps don't matter for anything, just the watts. But the watts rating is a sort of phony number invented by what amps you happen to get at Vmp.
I can sort of see that if you drop the voltage in half from 24 to 12, that amps would double, which is why 24v panels have half the amps of a 12v panel. MPPT outputs 12v from a 24v panel. It doesn't quite work out that neatly for doubling, but sort of.
But we have an example of a 36v panel vs a 39v panel and of course the rating faked up number 220w means there are more amps in the 220w for the 36v panel. How does that have anything to do with amps doubling going from 24v to 12v?
I think I could get this if I got hit on the head a few times with a 2 x 4, but maybe you guys could give it another try here first.
Thanks.
