Heat 1, MPPT 0
Previously we noted that heat is hard on MPPT due to the panel's loss of voltage with increasing heat. Doesn't bother PWM though, you still get Isc or more. This Spring, I took some measurements p...
Forum Discussion
By noon, the batteries have been charging at 16 amps for "4" hours, so after receiving 64 amp hours, there is going to be drop of in battery acceptance, even without heat causing a drop in panel voltage
I know I have a heat problem, I wish I had made my brackets taller
But I would not be do quick to say a 0.5 amp drop during heat is a loss from PWM to mppt (8.5>8. Or 16.5 > 16)
Did either of you check watts output with a "watt meter"
You can't directly compare amp hours only
The mppt will be boosting voltage, which means higher watts at less amps
If the PWM is doing 8.5a*x volts and the mppt is doing 8.0a * y volts, there may not be any loss at all, there may even be a gain
If the panels get so hot the voltage is low, the MPPT should be passing the amps straight thru
I know I have a heat problem, I wish I had made my brackets taller
But I would not be do quick to say a 0.5 amp drop during heat is a loss from PWM to mppt (8.5>8. Or 16.5 > 16)
Did either of you check watts output with a "watt meter"
You can't directly compare amp hours only
The mppt will be boosting voltage, which means higher watts at less amps
If the PWM is doing 8.5a*x volts and the mppt is doing 8.0a * y volts, there may not be any loss at all, there may even be a gain
If the panels get so hot the voltage is low, the MPPT should be passing the amps straight thru
