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Sorry can’t help with the convincing of him.
However, if you can afford it maybe consider investing in battery + inverter (or solar + battery+ inverter if budget stretches that far).
Prices for batteries have come down a lot and with an EV you’d qualify for electric tariffs like Octopus Intelligent Go or Eon Next Drive which is like 7p overnight.
So you charge EV and house battery overnight at cheap rate and run your house off the energy stores in it during the day meaning you use very little peak energy from the grid.
I’m having mine installed a week on Monday.