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That sounds like a problem with the inverter sensing which load it is feeding. After all the problem is quite trivial. If there is excess power over consumption in the house and the car battery needs charging, then the excess is fed to that. Once the car is fully charged that circuit is disabled...

I have a World Solar 5 kW system on my roof here about 50 km North of Auckland NZ (lat 36° S). This way works for me. I got the 5 kW inverter programmed to charge the car first with any surplus power. Then the spare power is fed back to the grid, should be a simple matter to feed power to the...

I have a grid connected 5 kW solar system in NZ and was easily able to get an installer to arrange the software on my inverter to preferentially charge my car before feeding back power into the grid. I have a 7 kW max circuit set up for this and have had NO problems at all. Admittedly here in NZ...