4 Feb
2009
4 Feb
'09
5:24 a.m.
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.