Not missing the point. 95% of my charging is at home, on totally renewable energy.
and
Also not missing the point @WhenPushComesToShove. I charge at home, using electricity from a renewables-only supplier.
You may not have missed the point but you have not understood it. Unless you have your own solar or wind farm separate from the National Grid it is just not possible to claim you only use renewable electricity.
You may have a supplier which claims to source 100% renewable electricity for your tariff. It works like this: your supplier has a series of contracts with generators. It is possible that for every kWh of electricity they sell you they have contracted for a kWh of electricity from a renewable generator. But it is also quite legal for them to buy some, most or all of it all from a coal power generator, buy the equivalent in REGOs (Renewable Energy Guarantees of Origin - carbon credits) and sell it to you as 'renewable,' which is what most of them do. That's on the commercial side of things.
On the scientific side, while there is always a certain amount of genuine renewable energy being put into the system it varies during the course of a day, week etc. You know full well that on a still night there is no solar and almost no wind power. Your supplier contracts with a generator for the supply of wholesale electricity for, typically, 30 minutes' at a given time. If, during that window, your supplier's genuine renewable generator isn't producing electricity, then your 'green' supplier automatically sources it from the grid through a clearing system from other generators - a mix of gas, coal, nuclear, hydroelectric and imports. You get no choice in the matter, even on your '100% renewable' tariff.
Anyone who claims to be charging their car at home on totally renewable energy sourced from the grid has been greenwashed. You may feel good about it, but you are plain wrong.