My power bill is at least 50% based on max power usage, not total energy usage. The utility keeps a running 15 minute average and whatever the worst 15 minutes for the month was, I get billed roughly $12/kw. So if I peak at 20kw, then that part of the bill is roughly $240. I would like to be able to monitor my current wattage and tell the Tesla to only charge when I am otherwise pulling less power. For example, I might want the Tesla to not charge at all unless I am using less than 15kw and then only to charge to a max of 18kw total. So if my non-Tesla usage was 15kw, the tesla would be set to 12 amps or roughly 3kw bringing the total to 18kw. If my non-Tesla power were down to 10kw or less, it would be allowed to charge at 8kw (~32 amps). Has anyone done something like this? The car doesn't have to react instantly because it is a running 15 minute average. For example, say I am at 18kw with the Tesla pulling 8 of those, then the building AC clicks on and adds 5kw, that would take me to 23kw, but if the Tesla lowers its power draw gradually over say 20 seconds, it would not be an issue. Anyone done this or know how to?