NO-GRID Inverter Does Not Detect Grid

Fault Description

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

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
• One of the main reasons this fault may appear is an incorrect grid code being set. During the units "burn" in period at the factory 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.

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