[rescue] Any recommendations on rack-mount UPS?

Joshua D. Boyd jdboyd at jdboyd.net
Mon Oct 12 14:28:55 CDT 2009

Patrick Finnegan wrote:
> On Monday 12 October 2009, Robert Darlington wrote:
>> Consider Liebert.  In my circle, APC sells junk.  No matter what, if
>>  you care about it, I'd go with AGM batteries in the very least. 
>>  You'll wish you did when the day comes and you need to get the old
>>  gel cells out, but you can't because they swelled up and are
>>  permanently locked inside the equipment.
> The swollen battery problem seems to be caused by the UPS overcharging 
> the batteries.  The beige APC units seem to be bad about this, but I 
> haven't seen it happen with the newer black units yet.  
> I second Liebert, and add Powerware/Eaton.  They both seem to have nice 
> rackmount units.  The only problem I have with the Liebert units that we 
> had at work were that replacing the batteries wasn't trivial - you had 
> to take the unit 1/2 apart to do it, which involves removing a couple 
> dozen screws, and reaching around live battery parts (a 96VDC battery 
> string) to disconnect the batteries.  Other units probably aren't quite 
> as bad.

The Liebert that I removed batteries from was pretty simple.  It was 
open door, turn a doohickey (not a thumb screw, but something with a tag 
to twist, no tool required), and pull the battery out. Nothing to fear 
in terms of personal damage, and no tools required.

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