Solar string sizing calculator (panels per MPPT)

Maximum panels per string

10

Minimum panels per string

4

String Voc at coldest temperature

459.8 V

String Vmp when hot (60°C cells)

125 V

Inverter voltage window

120 – 500 V

Safety margin at max string

40.2 V

Cold-temperature Voc rise is the number that destroys inverters in Ghazni winters. Never exceed the maximum panels per string shown above.