Question about the output from my DIY Solar
So I could use a "shove in the right direction." My Solar is all DIY. Two 100 watt panels, an EPEver 30A MPPT controller. One group 27 (for now). It's working. It's keeping the battery charged. ...
Forum Discussion
Shorting the panel does not harm it. That is how you measure Isc and Voc with your meter.
You can do the whole array at once by shorting the wires with your meter at the controller's input terminals. ( Wires out of terminals) If result is unsat you can do one panel at a time if you can get at its wires on the roof
If your rated Voc is 22v, you will see more like 20v a few minutes after the panel is in the sun due to panel heating. Your Isc will vary with the sun's angle to the panel.
Mid-day in summer with panel aimed you should see amps to the battery at least to the Isc rating, which is what you will get with PWM. Might get a touch more with MPPT--I get the same amps in that situation either way. MPPT does better in the shoulder hours.
Don't confuse Imp at the array side with amps to the battery with MPPT. Don't use Imp with PWM at all--use Isc as expected amps to the battery
Watch out with a meter that says 10 amps limit! You can fry the meter if it does not have a fuse you can replace.
You can do the whole array at once by shorting the wires with your meter at the controller's input terminals. ( Wires out of terminals) If result is unsat you can do one panel at a time if you can get at its wires on the roof
If your rated Voc is 22v, you will see more like 20v a few minutes after the panel is in the sun due to panel heating. Your Isc will vary with the sun's angle to the panel.
Mid-day in summer with panel aimed you should see amps to the battery at least to the Isc rating, which is what you will get with PWM. Might get a touch more with MPPT--I get the same amps in that situation either way. MPPT does better in the shoulder hours.
Don't confuse Imp at the array side with amps to the battery with MPPT. Don't use Imp with PWM at all--use Isc as expected amps to the battery
Watch out with a meter that says 10 amps limit! You can fry the meter if it does not have a fuse you can replace.
