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Constant .8-1.2kw draw... even with main panel shut off
Since my powerwall install I've been coming to understand my house's energy use, and got to wondering about what I'll call the baseline power usage that my house never drops below. It started at around 1.4-2kw, and I've managed to drop it to .8-1.2kw by changing how my furnace fan runs.
The weird thing is that, even with every single breaker in the main panel shut off, the app says the house is still constantly drawing .8-.9kw. Same is true if I shut off the single main breaker.
It seems wacky to me that anything can be using nearly 1000w when every load in the house is disabled. The only things left online with that .8-.9kw reading are the solar panels and the powerwalls, and the app's indicated load stays the same even with grid power shut off (ie, says house is taking .8kw+ from solar generation and the balance is going to power walls).
Is it just some kind of multi-minute lag in the app's display? If not, any ideas about what could be slurping down nearly 1kw when, with the house's main service panel shut off, one would expect that the house should be drawing zero?