Step 7 Minimum Start Voltage

Concept

Voc STC Open circuit voltage of the PV module at STC (V) 

Voc min Minimum open circuit voltage of the PV module (V) 

βVoc Temperature coefficient for open circuit voltage (% °C⁻¹ or % K⁻¹) 

• ≠ βV Pmax in Step 6 Minimum MPPT Voltage

Tmod max Highest module temperature (°C) 

• Assume 75°C if not given

TSTC Module temperature at STC (°C), 25 °C

7.2 Calculate Voc min

During inverter in OFF state, the lowest open circuit module voltage is 30.629 V.

Worst case scenario:

• Assume inverter start at mid-day.

• So, the module temperature reaches highest.