I bought a used EV in 2024, with a ~50 kwh battery, and charge it offgrid.

It charges only when the sun is shining, not from the house battery, which could all drain into it and be a drop in the bucket.

See offgrid electric car for what it was like to get the EV while still building up the solar capacity to charge it.

My DC system being 24v has prevented me from installing a level 2 EVSE, which would pull too many amps. So I level 1 charge, but at a maximum of 16 amps. That is enough to charge the car about 25% per day, which is plenty for me, eg it's a trip to town and back.

Due to the overpaneled solar system, the car is able to charge almost every day. I've programmed the charger to ramp down to 9 amps as needed to match the available solar ower, and at that rate it can charge on every day except for the darkest of rainy days. A cloudy day with no visible sun does not prevent charging the car at least 10%.

L1 charging, expecially at low amp rates, is inneffient. So is the inverter, and other parts of the system. But that doesn't matter much, because usually there is more power bouncing off the solar panels than anything in the house can use.