What solar panel specs are used for calculating voltage loss
Which solar panel specs are reasonably used for calculating line voltage loss?
Forum Discussion
smkettner wrote:
^^^ what is missing is the controller set point assuming PWM.
I don't have a PWM set-up anymore to test with. However I do still have the manual for my old ASC controller that has a "field test" in it that may be what smk is talking about there.
"Put a solar panel in full sun. Remove any connections. The Voc needs to be 17 volts or higher to do this test.
With all ASC connections removed, connect panel + to the ASC's Array+ and panel - to the ASC's Array - (no battery connection
Measure voltage at BATT+ and BATT- terminals on the ASC. The reading should be between 14 and 15 volts (units with temp comp and adjustable set-points may vary beyond this range.
A very high reading 16-20 volts would indicate an open FET or very low reading 2-5 volt would indicate a shorted FET (open FET means will overcharge. Shorted FET will not charge a battery)
Another thing is a note I have from playing with that controller, where I had it on a battery with no array. Batt terminal v was BattV of 12.53 and there was 1.39 volts at the array terminals.
