NO-GRID Inverter Does Not Detect Grid

Created by Victor Herrera, Modified on Tue, Jul 23 at 6:55 AM by Roberto Hernandez

Fault Description

The fault NO-GRID is caused by the inverter not detecting voltage at the grid. 


One of the main reasons. Typically this happens at the factory during the units "burn" in period. They are programmed with a specific grid code for the burn-in process, right before they are shipped out the grid code is changed to their country of origin's grid standard.


Possible Causes


  • The inverter is not detecting any AC
  • The incorrect grid code has been selected
  • The inverter DC switch was turned on before the AC switch


Troubleshooting and Possible Solutions


Test – DC switch OFF:


• Check AC at the inverter test points

• L-L, L-GND

• Do NOT tell me 240VAC

• Check LCD reading, may be a bad

measurement circuit


Test – DC Switch ON:


• Check grid standard

• Replace inverter


Change the Grid Standard:


On the LCD proceed to the ADVANCED SETTING section. Enter the password 0010. Select “Turn Grid off or on”. Select off. Choose SELECT STANDARD select UL-240V-A, UL-208V-A, UL-240V, UL-240V. hit ENTER to confirm setting. Go back to Select “Turn Grid off or on”. Select on. Wait 5 minutes and the alarm should clear. 


US Grid Code Meaning

UL-240V-A - AFCI ENABLED - Split Phase

UL-208V-A - AFCI ENABLED - Single Phase

UL-240V -  AFCI DISABLED - Split Phase

UL-208V -  AFCI DISABLED - Single Phase


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