[CentOS] Emergency rescue help needed
John R Pierce
pierce at hogranch.com
Wed Feb 4 05:24:27 UTC 2009
tech wrote:
> John R Pierce wrote:
>
>> all the BackUPs I've ever seen have been simple relay switched units.
>> when the power is on, you're getting unfiltered power (except for a MOV
>> based surge protector), when the power is out, it switches to the
>> "modified square wave" inverter output.
>>
>
> John,
>
> There are units that change the AC to DC. The DC then charges the
> batteries and gets changed back to AC for the equipment. These units are
> very expensive though.
>
There are online UPS, as you describe. I don't believe any of them
have the APC BackUPS brand name on them. I don't even think APC
SmartUPS are online, however as I said, the SmartUPS do have power
conditioners.
More information about the CentOS
mailing list