On 04/15/11 4:38 AM, Howard Fleming wrote: > I have used several Best Ferrups UPSs over the years, other than one > that toasted it's transformer, have never had any trouble out of them > (just replace the battery every 3 to 4 years....). > > They are picky about their input power, do not run not connect them to > an auto regulating transformer (not the proper term?), or on the output > of other UPSs, it can cause interesting problems... I don't think they make any FerrUPS anymore. Those were based on a massive ferroresonant transformer which, yes, is very sensitive to the input frequency. Specifically, they don't like generator power, unless it has extremely well regulated frequency output (such as a DC generator with a digital sinusoidal converter)