Building my own pseudo(Powerwall)

[evmusic]

If you go the back feeding generator route, make ABSOLUTELY sure you have a way to island the house. Usually something as simple as an interlock kit will do the trick.

Last thing you want is the grid coming back up while the generator is feeding the house.

Indeed. The same way you would do with mobile generator and not t blow up everything. Following safe and best practices are still a requirement

 

[Xianrecords]

I have not been on that forum for a while. I have finished my Solar Setup along with the Battery Backup.

I am using a AC Coupled System with 22 Enphase inverters and 2 SMA 6048 Sunny Island.
I am also using the same Transfer Switch panel that has been talked about in that thread.

I have current sensors at every branch of the Panel.

I am experiencing a strange behavior.

When the ATS is in bypass mode and not going through the inverter, the current sensors/monitoring are reporting the current direction correctly on both the critical load and the non critical load side.

When the ATS is in inverter mode, the current sensors are reporting the current direction correctly on the critical load but they are reporting inverse current on the non critical side including the Main branch. I checked the Grid Meter and I guess it is not using current sensor as it is reporting the flow of the current properly (When excess current, report negative power - going to grid)

I have attached pictures illustrating both scheme.

Does anyone have any idea what is going on ?

Thank you,

 

[Xianrecords]

I have added a couple of other pictures showing more details about the setup

 

[L-P-G]

How does your sunny island use AC1 and AC2? Are they inputs/outputs or bidirectional?

 

[power.saver]

I have added a couple of other pictures showing more details about the setup

Where are the voltage sense wires for the Current Monitor connected (not the CTs)? Presumably on the Critical Loads side.

In Bypass Mode, measure the voltage between the Critical Load side and the Non-Critical Load side, on the same phase. If not zero, then the AC1 phase wires are reversed.

 

[Xianrecords]

How does your sunny island use AC1 and AC2? Are they inputs/outputs or bidirectional?

AC2 is the grid, AC1 is the load side

 

[Xianrecords]

Where are the voltage sense wires for the Current Monitor connected (not the CTs)? Presumably on the Critical Loads side.

In Bypass Mode, measure the voltage between the Critical Load side and the Non-Critical Load side, on the same phase. If not zero, then the AC1 phase wires are reversed.

 

[Xianrecords]

@power.saver - You are my savior. How stupid of me ! Indeed the phases were reversed. Makes total sense now, Thank you so much.