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I heard back from Tesla today, so I guess I owe them an apology for implying that their customer service wouldn't provide an answer in a reasonable amount of time. The voice mail message stated that the designer ran the load calculation and I should be fine to add the hot water heater. I had...

Sorry, the backup load center has a 225A rating on the bus bar. There is a 125A backfeed breaker from the Tesla gateway, and 330A of breakers feeding loads. The main panel has a 200A main breaker, and a 125A breaker to the gateway, and no other loads. Not sure what the bus bar rating is > 200A...

That thought occurred to me as well, but, ... yuck. I installed solar, and drive electric (partially) and am replacing a gas water heater with an electric heat pump model to save the planet, damn it! The idea of buying and installing a hot water heater only to immediately junk it, seems...

The busbar rating is 225A, The total amperage of breakers in the backup load center (excluding the 125A backfeed one) is 330A. I can remove a 35A of breakers that go nowhere useful (long story, but think older house that had the loads from circuits removed during a remodel, but the breakers are...

I I think I backspaced over part of what I was writing, and I don't see an 'edit' button. This should read "so real world this would be more like a 45-50A peak load."

I think there are really two scenarios to consider: Grid power available, so we care about the 125A breaker in the load center: Maximum conceivable load would be something like 32A (mobile connector) + 24A (water heater, high demand mode) + 6kw/25A (twice the maximum load I've ever seen for the...

Tesla installed the system. Frankly the idea of going without hot water for the time frame it would take Tesla to return an email or phone call, let alone address the situation terrifies me. It doesn't seem realistic that everyone with a back up load center is now dependent on Tesla for every...

We just got our PTO from PG&E on our system last week, and because our gas hot water heater just failed, I would like to add a 30A circuit for a heat pump hybrid water heater. I need some help to understand what type of load calculation I may need to show the building department to add another...