Personally, I think the first solution would be to monitor the power consumed by the EVSE with an electric meter. Only if there’s a problem of people stealing electricity search for a solution to the problem.
As others suggested, you could keep the current Tesla Wall Charger and put it or the cable that goes to the car inside some sort of locked box. You could also flip off the breaker when not in use or have some other form of lockout on the power. While relatively low cost, you may not get something that’s unobtrusive.
WattZilla sells EVSEs that you can buy with a physical key to activate the system. They are nice because they can provide 80 amps, just like the Tesla gear. With a key lock , the single port WattZilla gear is just shy of $2,100.
Schneider Electric has EVSE units with RFID lockouts built in. These cost a little over $2k per outlet. You could replace your Tesla Wall Charger with that. No billing capabilities here, just need an RFID card before you can use the system to keep freeloaders from using power.
Nayax, a company that provides credit card readers to many vending machine companies, has an EVSE with a credit card reader.
Electric Charging Stations | Best EV Charging Station Tel Aviv, Israel also comes in at about $2k per outlet, but can have a small subscription fee based off how you do chargebacks.
Of course, there’s also the 800 pound gorilla (ChargePoint), but they’re closer to $3,500 per outlet and also have a monthly subscription fee.
