If the emergency disconnect for the TEG is ever engaged (by the fire department or anyone else), when the system is reconnected after whatever precipitated the emergency, grid power is required for the TEG to startup again, even if there's plenty of juice in the Powerwalls or available from the inverter. This is straight out of the installation manual, confirmed by Tesla and observed by me during testing. If the grid is out (an entirely viable scenario), to get going again the installation manual says a "12V Jump Start" must be given to the TEG. But it doesn't explain how. Does anyone know the specifics? The best I got out of Tesla support was that I had to call their emergency response team in such a scenario -- which is ridiculous.