Solar charging with some shade
I'm facing west today, so I'm getting a pretty good shadow on one of six series-connected panels. Panels are all around 135w @ 12v. Shade is on the far-left panel - about half of it: No...
Forum Discussion
westend wrote:
Those freakin' IMP's...
AFAIK, the current at maximum power could be measured between the panels and the controller. The rated IMP of the panel doesn't change, of course, but the current changes with shading.
Yes you get the Imp along the wires from the array to the controller by actual ammeter measurement.
But that is just what "goes with" the array output watts and the controller's choice of Vmp.
What I don't understand is the array watts components in V and A before you divide by Vmp.
If the shaded panel's amps is the "array" amps as the lowest amps in the string, then the array watts should be using that low amps amount for its A in the VA.
But who says that is the same amps amount as what the Imp is when you divide the array output watts by the controller's Vmp?
