For battery backup?
I just bought this on Amazon after a lot of chatter w/ @telegraham and others, was on sale for $178.
Found HERE
I have 1 smart plug into it and that controls 4 vital equipment. Return Chamber Pump, Heater, Kessil and Maxspect gyre pumps. Depending on the season I can pick what I want running.
Yes, for battery backup, because it's DC so it's supposed to work. I sent them the question but haven't heard back.