I require some comments regarding whether I should be concerned that, as shown in the photos, there is a varying quantity of feed-in current entering back into the grid. An ET112 sub-meter is placed close to the grid meter for monitoring. Is there anything I can adjust on the ESS system or AC wiring system to minimise or completely stop feed-in current from entering the grid?
I’m using ET112 too for the grid metering and I can see that you already set grid setpoint to 20W. Through my research, there is nothing more you can do to reduce this to zero other than disconnecting from the grid.
But from my observation for the past few months using it, it is fine so far and no complain from the energy supplier. You can see that the system will try to keep the reading at 0W.
An ESS feeds energy into the supply so is always feeding-in. All you can control is what happy to excess hence the legal requirement in many countries for certification of systems to also include redundancy. Disconnecting the ACIN and powering loads on the ACOUTs is the only way you will not ever feed into the grid supply.