That is one KEWL toy!
I have had the idea of taking an old car batery, a 12v DC to 120v AC inverter and fitting them into a cabinet (with a metal liner inside) to be made into an end-table. I'd use an automatic trickle charger on a timer to keep the battery "fresh" and charged.
In an outage, one would simply plug in a lamp, the telly, a radio, a computer and maybe the fossil-fueled boiler controls........