The stove has 4 motors - 2 blowers, and 2 low-rpm auger motors. Would a modified sine-wave UPS like this work, or do I need pure-sine? For the price of the pure sine, I'd almost wonder about building my own backup power supply. But I don't know what all would be involved with that - I imagine I'd need a good charging circuit, a solid-state relay to switch between mains and backup (would this present a danger of overvolting though?), and a sine-wave inverter, which I can buy at one of the various surplus stores I know of. Suggestions? Comments? General OT nef replies?