My 5kW Sunsynk inverter has been operating without any issues since 2023.

The non-essential load (Home Load) has always displayed as 0W, while the UPS load typically shows between 500W and 800W, which is expected. My understanding is that the Home Load remains at 0W because the CT clamp was originally installed just before the cable enters the inverter, with the CT arrow pointing towards the grid.

I mapped out my DB and inverter connections, as shown in the attached diagram. Based on recommendations, I moved the CT clamp from Position 2 to Position 1, as indicated in the drawing.

The inverter was completely powered down during the change, so it performed a full reboot afterwards.

Despite moving the CT clamp, I still cannot see any non-essential load being reported. The sub-DB and geyser loads remain completely invisible on the Sunsynk flow diagram.

Is there a setting that needs to be enabled for non-essential loads to be displayed, or should this work automatically once the CT is installed in the correct position?

I have also logged a support ticket to have the inverter firmware upgraded in case this is a firmware-related issue.

Edited yesterday at 11:051 day by MartinViljoen

1 hour ago, MartinViljoen said:

The non-essential load (Home Load) has always displayed as 0W, while the UPS load typically shows between 500W and 800W, which is expected. My understanding is that the Home Load remains at 0W because the CT clamp was originally installed just before the cable enters the inverter, with the CT arrow pointing towards the grid.

According to my Sunsynk installation manual the CT coil's arrow must point to the inverter - see screenshot below:

I'm not a sparky, but given that your inverter + PV panels should feed your non-essentials while the sun is shining, is it correct to "feed back" to your non-essentials from the "output" side of the earth leakage, as shown in your diagram?

I managed to resolve the issue. I didnt have the clamp the right way around, my mistake! Its now facing the grid.
Also I didnt know i needed to change the System mode to "Limited to Home" , initially when i enabled Limited to home with the CT facing the Inverter it gave weird and negative values.