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Which UPS to buy?

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Note that if you have a generator, or might in the future, don't get a cheap UPS. Because a generator won't output a steady 60GHz in the same way your electric company does, cheap UPS's are prone to cycling between battery and line (generator) which will wear out the relay and/or burn out the UPS.

Unfortunately, the newer APC units with the LCD screen's all suffer from this problem, either because they were taken over by Schneider Electric who has an engineer with a screw loose, or simply cause they want you to buy the the more expensive "On-Line" series.

For this reason and other's I've switched from liking APC to Tripp Lite and suggest the "double-conversion" or "online" type of UPS.