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The A/C Coupling testing has gone well. The SolarEdge starts up normally every day. Getting alot more battery storage and very little import/export. This system was converted from two SUN GTL-1000 inverters. The E/V charging works well, charged at 7kw rate with 2kw delivered from the batteries...

My plan was to follow the eg4 schematic. That's back feeding is my concern also.

It seems I could buy a new independent EV charger as a work around. The other option would be to put all the existing panels on the eg4 18kpv by replacing the SolarEdge optimizers. With a new EV charger also.

Can an EG4 18kpv be wired into a 200 Amp panel with a backfeed breaker along with an existing SolarEdge GTI which is also on a backfeed breaker? What is the reason for taking the existing system off the main panel if there are enough opening?

The SolarEdge optimizers probably will not connect and output to the eg4-18kpv. The optimizers probably would need to be replaced with others like a Tigo or You could keep the SolarEdge and connect to the eg4 in the a/c coupled scenario. This is currently the situation for me.

I just purchased an eg4 18kpv. In looking at the schematics I'm thinking my existing SolarEdge SE7600 EV inverter can be A/C coupled. The inverter has an EV connection and has the ability to draw power from the grid. Will this work on the eg4 18kpv A/C coupled or not?

The SolarEdge SE-7600H Inverter / EV charger can be A/C coupled with the EG4-18Kpv hybrid inverter.