Multi-family housing has lots of issues like this. How can rooftop solar be managed for a multi-family building (especially a rental building)? For a smaller apartment building with a shared garage, even if you go through the expense of running electric lines to the garage tied to individual units’s meters, what’s to keep an unscrupulous neighbor from using someone else’s charger? I’ve been contemplating buying a ren…
I'd put in something like a chargepoint charger and set the kWh price to about the local average electricity prices, and maybe help your tenants get chargepoint rfid tags. If you can put a publicly accessible charger at the street as well as tenant only chargers, that would again help you make economic work of your solar panels.
You could also run the whole building on one utility meter, and include electricity in the rent... But that's asking for cryptocoin miners or grow operations as tenants.