A couple of years ago I pieced together various bits of info on how to add:
- Start and Stop control to a 7KW ROLEC EV Car Charger
- Charge Rate control to the same charger
The first part - is simple, and can be done very easily, using any contact controller to interrupt the charge control wire.
The second part was more complicated and needs a bit more kit.
If its something that might be helpful or useful, I will do a write up. It has been reliable for a couple of years and allows the dumb charger to become smart and consider excess solar to control the charge rate (I do that using Node Red but of course possible in Hass automations too).
My current dashboard to control the device is:
A combo of Bubble cards, sensors created and the absolute current and power are coming from power sensors (separate to the main work, on esp monitoring various power cables in the house)