How to Design Solar PV System
Home > Support > How to Design Solar PV System: How to Design Solar PV System Solar charge controller sizing PV module specification Pm = 110 Wp Vm = 16.7 Vdc Im = 6.6 A Voc = 20.7 A Isc = 7.5 A Solar charge controller rating = (4 strings x 7.5 A) x 1.3 = 39 A So the solar charge controller should be rated 40 A at 12 V or greater.