Multi-Inverter System w Powerwalls Question About Pulling From Grid

[DJ Frustration]

I’m curious about where power comes from under a certain scenario. Here goes:

Inverter 1 w 4 PWs (in backup mode) is generating 8kW from solar and is feeding it back to the grid since the home is only needing 2kW.

Inverter 2 w 2 PWs (in backup mode) is also generating 8kW from solar but the home is using 14kW as I’m charging a car. The app shows that it’s pulling 6kW from the grid.

My question: even though the app shows inverter 2 pulling 6kW from the grid, is that energy really coming from the excess power that inverter 1 is sending back to the grid? Apologies if this is a stupid question.

 

[jrweiss98020]

You'll have to look at your meter to find out for sure. Does it register on both sides (incoming and outgoing)?

 

[BrettS]

Yes, assuming that you have two separate systems, each with their own TEG that are connected to the same electrical service with one grid connection. Because the two TEGs are separate and don’t know what the other is doing you won’t see this in the app, but the power for the second system will be coming from the excess solar power produced by the first system, and in your example you will be drawing no power from and sending no power to the grid.

 

[DJ Frustration]

Thanks @BrettS. I suspected that was the case.