For now it’s just a lead acid plus pwm charger, so actually only a short battery run time. When I have a spare few hundred dollars I’ll add a 100Ah LiFePo4 and MPPT, this will be so much more resilient.

I’m thinking two day. On solar indefinitely, I do live in CA though. I’m creating several levels of sleep for each server including full shutdown. There is a sys-admin RPi that monitors avail. power, consumed power and can shutdown any other server. I’d like to monitor the weather so it anticipates.