9 Commissioning Inverter
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9 Commissioning Inverter
9.1 Checking Electrical
1) Check PE connections with multi-meter:
To make sure all the bare metal surfaces of the inverter are grounded.
2) Check DC voltage value:
Check if the DC voltage of the PV string exceeds the allowable range.
3) Check the polarities of the DC voltage:
To make sure the DC polarities are correct.
4) Check the ground insulation of PV array with multi-meter:
Ensure the impedance value of ground insulation is more than 1MOhm.
9.2 Checking Mechanical
1) Ensure the inverter is installed properly, fixed with a Wall-mounting bracket firmly, and
the upper cover is installed correctly.
2) Ensure the AC connectors are installed properly and fixed firmly.
3) Ensure the dust covers are sealed reliably which are used for the empty DC
connectors.
4) Ensure all the cables are connected effectively, fixed firmly, and no visible damages to
the insulation layers.
9.3 Start-UP Inverter
After electrical and mechanical inspections, first turn on the AC main switch/breaker,
then turn on the DC switch. The inverter will start automatically when the DC input
voltage meets the performance requirement of the utility grid.
Normally there will be three statuses during the operation (refer to the LED indications):
1) Waiting:
Conditions: The initial DC voltage of the PV strings is greater than the Min. DC input
voltage, but is lower than the DC start-up input voltage.
Inverter cannot start-up normally and cannot feed power into utility grid either.
2) Checking:
Conditions: The initial voltage of the PV strings exceeds the start-up DC input voltage of
the inverter. Meanwhile both the voltage and frequency of the utility grid are normal.
