Grid Phase Wrong (W03) Error With 3 Single-Phase Connected Inverters on a Three-Phase System

Created by Bryonie Simon, Modified on Wed, 25 Jun at 1:12 PM by John Jackson

On a three-phase inverter you have the ability to change the phase rotation of the system natively in the inverter settings between 0/120/240 (clockwise rotation) and 0/240/120 (anti-clockwise rotation).

On the single-phase inverter this is not a built in setting. So when installing 3 single-phase inverters across three-phases you have to perform a workaround to clear the W03 alarm.

For a usual setup on a system with 3 singe-phase units on a three-phase system the parallel settings should be as below:

	A	B	C
Parallel	Yes	Yes	Yes
Master or Slave	Master	Master	Master
Phase	A	B	C
Modbus ID	1	2	3

If the settings are set as above and Grid Phase wrong occurs, LEAVE ALL CONNECTIONS THE SAME, but change the settings to the below:

	A	B	C
Parallel	Yes	Yes	Yes
Master or Slave	Master	Master	Master
Phase	A	C	B
Modbus ID	1	3	2

This settings change allows the system to detect a change in phase rotation and clears the fault.