Watts needed
I have read where folks suggest any where from 1 to 2 watts of solar per ah of battery. My question, is this based on battery rating (ie 215 AH) or is it based on useable amp hours(105)? All reply...
Forum Discussion
Just from being flat you would lose more than 6 watts out of 720. Then add heat loss.
Heat loss might be a bit less with panels flat (not sun direct) so pretend you lose 5% instead of 10% 5% of 720 is 36 watts. Say 5% from being flat in June in Arizona for another 36 watts. panel output now 720 - 72 = 648w.
If panels were 720 out and wiring loss is 2%, 2% of 720 is 14.4 watts. It just doesn't work out right.
That 714 must be from something else. Whatever, your set-up is working. Not so sure about the readings for what is measuring what though.
Heat loss might be a bit less with panels flat (not sun direct) so pretend you lose 5% instead of 10% 5% of 720 is 36 watts. Say 5% from being flat in June in Arizona for another 36 watts. panel output now 720 - 72 = 648w.
If panels were 720 out and wiring loss is 2%, 2% of 720 is 14.4 watts. It just doesn't work out right.
That 714 must be from something else. Whatever, your set-up is working. Not so sure about the readings for what is measuring what though.
