build an ev 61581 controller board with epc and ssr and rcm for 14 cars with APP for client and PC sw for system/server control. a wattmeter sends the total building load, and the system charges cars, never surpassing the max building load incl. all inhabitants consuming power themselves ofc. all intelligence stays in the building s fuse box, only a cable per car goes out to a type2 gun holder that has a QR sticker, nothing else. see attached pic for further explanation.
dont apply if you arent a specialist in ev car electronics and programming such sw.