In calculating load level, it's vital to remember that some fairly heavy loads, like a hot water heater, oven or anything that makes or removes heat by electricity, or a pool/water pump, air conditioners, or a big fridge with an icemaker, can switch their compressors or motors or heating elements on and off randomly and if several should occur at the same time, and you really have no control over that, you could easily be an either a 'high drain' situation with your battery, if that's what you are using, or even run it almost dead. The nominal load on the standard Powerwall is 5Kw, with surges of not more than 10 seconds to 7Kw, and it will provide some 13Kw/hours of juice. A good starting point is check your recent electric bill to see what your average daily Kw consumption is. Just divide the total # of Kw billed by 30 days or whatever your billing period is, and that will tell you how much juice your house uses in a day. On our single battery system, our daily consumption floats around 12Kwh per day, and with that, we can comfortably live off the PV production. We might be able to crank it up to 15-16Kwh per day but that might be the ceiling, unless we added more panels to provide more charging capacity. Or you might need more than one battery. Tesla will do a site survey for you, I believe. We've learned a lot about how to save electricity by having the Tesla system.My opinion, based on current code language:
tesla charging receptacles
hot tub motors
electric patio heaters
, and pool pump motors
As for whether the code should be updated, and whether you should account for those loads to cover yourself, those are different questions.