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Tripplite used to be the competitor of APC with the broadest line of double conversion units, but APC started making them a few years ago as they were apparently losing too much business by not having them available.

Since APC makes both types now, one might be interested in reading this report by APC discussing where each type might be the best choice.

I happen to have always used line-interactive units. But my computers all use switching regulation type power supplies, and the latest one (that blew out after 9+ years of 24/7 use with the power gymnastics related to storm Sandy) was one that did not seem to need a double conversion unit.

In particular, the output voltages must remain in specification with AC inputs in the range of 90 volts to 140 volts. The output voltages must remain in specification with THD of the input waveform up to 10%. Similarly, the voltages should be in specification with input frequencies from 47 cycles to 63 cycles. The power supply must tolerate an interruption of input power of at least one cycle.
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