String Voltage Calculator

Calculate string voltage with temperature coefficients for proper inverter sizing.

Panel Voc (Open Circuit Voltage) From panel datasheet at STC (25C)

Panel Vmp (Voltage at Max Power) Operating voltage at maximum power point

Voc Temp Coefficient (%/C) Typically -0.25 to -0.35%

Panels in Series

Minimum Temperature (C) Coldest expected ambient

Maximum Temperature (C) Hottest expected cell temp

Inverter MPPT Voltage Range (Optional)

Enter to check string compatibility

Inverter Max Voc (Optional) Maximum input voltage rating


                        Voc(T) = Voc(STC) x [1 + Coeff x (T - 25)]

                        String Voc = Voc(T) x Panels in Series

Voltage increases in cold weather and decreases in hot weather. Always check cold weather Voc against inverter maximum input voltage.

Enter inverter specs to see recommendations

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