GFI & storms

[mike31154]

The issue with most small UPS units (even if you use external batteries for more capacity) is that the inverter they use to convert the battery DC to AC for your equipment produces a 'modified' sine wave, somewhat chopped and analagous to a square wave. I think this is what Westom is referring to as not clean, or dirty power. This modified sine wave is hard on motors in particular, they may run, but it can be detrimental to their running life, depending on the quality of the motor. Things like heaters don't care if the sine wave is modified. As far as using deep cycle or other large lead acid batteries indoors, yes it is not advisable due to the fumes given off during charging, but if you set up proper ventilation, you can mitigate that problem. A search on solar or wind powered homes will provide plenty of info on folks using large banks of lead acid batteries to supplement their home power or run off the grid entirely.

If you want truly clean power to run your equipment during a power outage, invest in a true sine wave inverter (easily twice the price of most inverters available) powered by a deep cycle battery(ies) or a good quality generator. With a few extra components, relay, trickle charger, you can build a better UPS yourself.