Step 4 Maximum System Voltage

Concept

Ns max pv Maximum number of PV modules in series based on maximum system voltage of the PV module (units). 

Voc max Maximum open circuit voltage of the PV module (V) 

Vsys max Maximum system voltage of the PV modules/Maximum System Voltage from PV datasheet (V). 

• This value is maximum voltage limit allowed of the entire PV array for this model of PV module. 

• If more than this value may cause PV modules have safety risk (overheating etc.)

• Select maximum one is multple values are provided.

4.2 Calculate Voc max

Can direct take value in Step 2 Maximum Absolute Input Voltage >> 3.2 Calculate Voc max

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

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

Tmod min Lowest module temperature (°C) 

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

During inverter in OFF state, the highest open circuit module voltage is 38.154 V.