Derating 24v Solar Panels?
I'm considering running two 250w/24v poly panels; tracked/pointed during spring/fall, and flat during the summer; thru the Tracer 3215BN 30a mppt controller. I can also get 200w/24v mono panels, local...
Forum Discussion
BFL13 wrote:
The panel's Isc goes up a bit with more panel heat but voltage goes down more so power goes down too.
With PWM you are getting current, so more is better. As long as the panel heating leaves you enough voltage overhead you are good.
With MPPT it doesn't matter what Isc does, since you are not using that. You are using panel output power (reduced by heating), bucking that, then using controller output divided by battery voltage to get whatever amps that comes to for charging the battery.
But how about when the mppt controller is in pwm/abs? Is it still bucking, or simply passing thru something very close to Isc? (up to what the bank can accept)
