Having spent some time looking at this problem (House battery discharging to EV) and reading reports from other people, I’ve reached the conclusion there is no easy solution. I don’t have an AIO but do have a Gen3 Inverter, Gen2 Battery, GE EV Charger and 16 solar panels. As far as I can work out, export to the grid happens when there is surplus PV energy available and all systems try to only export as a last resort. So, if the EVC is calling for power and there is insufficient power coming from the PV panels, the system will draw extra from the grid to make up for the shortfall. But if your battery Is set to discharge (either because Eco mode is on or you are using a timed or automatic export schedule to upload to grid at peak rates) then that shortfall will be met by your battery instead. The best I’ve been able to achieve is to use my Home Assistant setup to switch off battery export if it detects that the car is charging at the same time the battery starts to export. As an aside, with my setup I’ve also found that the EVC operates more reliably when configured as a standalone module, I.e. not under control of the GE Inverter. I realise this seems counter intuitive but until I charged it to standalone I couldn’t even get it to charge the car at more than 6 amps / 1.4kW. This i think certainly is a firmware issue and there has been talk of an EVC firmware update coming at some point. Hope this info helps.
The EV charger is sold on the basis that it can do exactly what’s being asked, you shouldn’t have to find workarounds.
It’s sold on the basis it can do what the Zappi does (charge using only excess solar) but better and not discharge batteries when hooked up into a GE ecosystem. It doesn’t do either.
It’s getting increasingly frustrating with GE that the products don’t stand up to what they claim or at least respond in a reasonable time frame to assist installers/customers with how to ensure it does what it’s supposed to do.
This isn’t my first problem with a system that’s been running about a month.