Shade effect on series panels.
Pictured below is the shading on 2 of 6 series-connected panels: And this is what the controller says: So, 57.2 x 5.6 = 320w (IN) Normal (full sun) should be about 84 x 7.5 = 630w,...
Forum Discussion
2oldman wrote:BFL13 wrote:I'll hook up my new panel to a flashlight battery and see if you're right. No I won't.
I think the panel voltage is the voltage of whatever it is connected to.
Hmmmm. If you go panel-direct, the voltage on the wires is battery voltage, but that voltage is rising from the current flow. However, there is a limit to how high that voltage can go I believe.
I did that test (but with an MPPT controller) to see if my 60 cell panel could recharge a 24v battery bank and it got the batts to 31 volts and stalled out. Supposedly a 72 cell panel would get the batts to a higher voltage. (more cells in series in the panel)
The panel voltage limit is not its Vmp (but I have to check on that) because with MPPT in Float, the panel voltage displayed is higher than rated Vmp. But that is the controller's voltage not the panel's?
Who started this anyway? :(
