UPS as a stand alone inverter? [RE-wrenches]

[Doug Pratt]

Has any one tried using a high end sinewave (online, zero transfer time)
UPS as a standalone inverter?

Bill Loesch


I've got some limited experience. Back in the mid-90s Real Goods took a
pair of Best UPS units, one at 3kva, one at 7kva, that we were already
using for on-site critical backup, and by adding some separate robust
battery chargers (Trace SW-series inverters) and some funky
non-auto-starting generators, we made ourselves a couple of pretty
robust UPS systems. The Best inverters are always on. Normally they
recharge simultaneously from utility power, but they were damn fussy
about generator power. Rather than fight them, we just did battery
charging thru the SWs. We never had a utility outage longer than a day
or so. So all I can say is that short term, they presented no problems.
More battery capacity would have helped them greatly. The Best inverters
certainly held up well. Ten years later we're still using the 3k unit. I
suspect the efficiency really sucks, but efficiency is less of a concern
with UPS units than rock-solid reliability.

Doug Pratt  

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