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CyberPower LX1500GU-FC UPS Tear-Down

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Daniel Sauvageau

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I believe the answer to that is no. At least not if you want to run them at a substantial fraction of their maximum rating. Consumer UPS are only designed to run from their internal battery, relying on the fact that the battery will run out before the rest of the UPS needs to worry about overheating from heat buildup due to passive cooling and minimal case venting. With only 3-5 minutes of battery backup time under full load, the transformer(s) and heatsinks are still warming up by the time the battery cuts off. If you run it at 1/4 load, that causes 1/16th the I2R losses and the UPS might be able to run that indefinitely if you hacked external batteries into it.

When you get into higher capacity units that support external battery packs, like APC's BR1500G, you get a fan to keep things cool over the massively extended run time. Those should be able to run continuously since they are already designed to run at near 100% load long enough to reach steady operating temperature.
 
If I did it, I'd hack the case to remove the batteries, add active cooling using some of that space, and use external batteries.
The reason for going to all this trouble is purely a matter of cost; even a smallish Xantrex is going to be at least $250-$300.

Now there's an idea...buy a Xantrex and tear it down, comparing it to a UPS (where relevant; it won't have a charging circuit).
 

KaiserPhantasma

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thats the PFCLD series chetou is requesting to be reviews next ;) which is adaptive sinewave from what I know not pure
 

Daniel Sauvageau

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I bought one on sale a few weeks ago but I already have three other stories in the publishing pipeline and at least one other in-progress that I plan to send in before I look into my PFCLCD. I did look at the waveform and there is some cheating going on there but you'll have to wait for the story to find out what I mean. (Or it could be that my unit is out of specs. Either way, something fishy is definitely going on.)
 
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