I charge my 2014 Model S 85 in my garage at our condo through a 110 outlet. I’m retired so trickle charge is fine for me. My condo association wants to put a parking space outside for electric vehicles to charge. How do I show them how much it costs to charge my car? There is no separate meter for my garage. The homeowners association pays electricity for all garage electricity. They think my car charging is costing everyone more money.