I've just received this product, so this is a preliminary review. I purchased it because it generates a true sine wave output. My computer's power supply won't tolerate anything less. I've used probably 7 or 8 APC products over the years, and they've been very reliable. As the earlier reviewer said, this is a redesign of the SUA1000, and it's only been sold for the past few months. The only issue I have with the product so far is that the fan is constantly running -- even when no load is present. And, as the other reviewer noted, the fan is fairly loud. I've written to APC Technical Support because the constant running of the fan doesn't seem to be normal behavior. The fan runs constantly for about 5 minutes, then stops for a few seconds, and then resumes again. This occurs with a fully charged backup battery, running on AC, with no load plugged in and at normal room temperature. The only time I can get the fan to turn off is after I run a self-test. But after about 10 or 15 minutes, the fan begins to run constantly again with those very brief pauses. I'll have to see what the support people say.
2/15/2010 UPDATE TO REVIEW:
APC Technical Support informs me that the fan behavior I described above is completely normal. If you purchase this product, be prepared for a very loud fan that constantly cycles on and off (five minutes on and five seconds off) even with no load plugged in. When I asked whether it made more sense to have the fan run continuously without the brief pauses to minimize cycling of the fan motor, I didn't receive a response. I have no idea what purpose the brief pauses in the fan operation serve except to remind me how much I miss a quiet UPS. I was told that it would be possible for APC to release a firmware update to modify the fan parameters if enough people complained about the noise, but no firmware update is currently planned so I wouldn't count on it.
8/1/2011 UPDATE:
APC released a firmware update (see comments) that modified the fan behavior so it only operates when the unit is supplying battery backup to a load. The fan no longer runs while the load is being supplied by the AC mains. I've revised the review to five stars.
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