Step 3 Inverter Functional Test

Step 3.1 Calculate Voc stc string

Voc stc string = Voc stc * Ns

Voc stc string Open circuit string voltage at STC (V)

Voc stc Open circuit voltage at STC of PV modules (V)

Ns Number of series-connected modules (units)

Voc stc string = 30 * 13 = 390 V

Step 3.3 Measuring Data While Inverter is ON

Criteria 1 : <Grid voltage> within <Maximum AC voltage range> / <Operating AC voltage Range>

• Maximum AC voltage range / Operating AC voltage Range can refer to inverter datasheet --> AC output

• Grid voltage should be approximate to value in Step 3.2.

Criteria 2 : <Grid frequency> within <Frequency operating range>

• Frequency operating range can refer to inverter datasheet --> AC output

• Grid frequency should be approximate to value in Step 3.2.

Criteria 3 : <DC string voltage from PV array> within <MPPT voltage range>

• MPPT voltage range can refer to inverter datasheet --> DC input

Criteria 4 : <DC string current from PV array> below <Maximum DC current per MPPT>

• Maximum DC current per MPPT can refer to inverter datasheet --> DC input