Note by @fastfinge

@jaybird110127 I have a hole home battery backup. However, I don't switch to it automatically. I want to ration power, so I switch circuit by circuit based on what's going on. For example, in the summer I don't put the hot tub circuit on it, but in the winter I have to in order to prevent the pipes from freezing. I also shut down the servers and then take the battery backup away from them. Assuming I ration to use only the essentials (medical equipment, lights, refrigeration) I can keep everything going for up to five days without electricity or a fuel delivery. Also, the battery system can be charged by a Tesla charger, or any other electric car charging station. And it's multiple batteries, so if I think after 60 hours I won't be getting power back, I can take one discharged battery and recharge it, and bring it back without interruption to the power.