Characteristic . Maximum power at STC (P.max): 40Wp Optimum operating voltage (Vmp) : 17.2V Open-circuit voltage (Voc): 21.6V Optiumum operating current (Imp): 2.32A Short-circuit current (Isc): 2.62A Length: 537mm Width: 665mm Depth: 30mm Weight: 4.5 Kg