I have 4 units 150W each flexible solar panels, each is 36 cells. I have tested panels one by one, as well in series and parallel connection. I have used two different MPPT controllers, and I have test with a grid tie controller as well. I have Voc about 20(+) V per panel, but I cannot reach more that 40 t0 45 Watts per panel.
Please advice any fix!
Please advice any fix!