[TenTec] DC Power Supply Backup

[Eric F. Richards]

At 05:04 PM 5/21/2003 -1000, Ken Brown wrote:
>I do not know whether there is an "industry standard" for rating UPSs. It 
>may be that every manufacturer has their own unique way of rating that 
>cannot be compared directly with others. Sort of like antenna 
>manufacturers' gain figures. In any case, what I have seen in some UPS 
>ratings is that the "Power Rating" is the maximum power the inverter can 
>deliver, and the "Time rating" is how long it can provide 50% of the 
>"power rating" when the AC mains power drops out, assuming that the 
>batteries are in real good condition and fully charged when the AC mains drop.

Well part of the problem is that a UPS delivers VA and equipment is rated
in Watts, so they fudge a little on the power factor.

I can't help but wonder if the best solution for the original poster is to
simply look for a UPS that uses 12 v gel cels as the backup source and draw
from them directly.  (Assuming properly sized UPS batteries, of course...)




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Eric F. Richards
efricha at dimensional.com
"The weird part is that I can feel productive even when I'm doomed."
  - Dilbert