Take a look at "evcc". Careful: It's MIT licensed open source, but a a set of interfaces (to inverters, wall boxes, car APIs or smart meters) need to be unlocked with a sponsorship token; or patching the license check. -> https://evcc.io/en/

It's a stand alone server with a simple Web UI and takes care of charging your car with solar (or grid, if there is not enough solar). IIRC it offers three modes: 1. charge solar only, 2. charge with at least 6A, boost if there is more solar, 3. charge independent of solar. You can also configure charging targets, e.g. stop at 80% SOC.