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Re: UPS as backup power
The APC Back-UPS uses a "modified sine wave", which is more of a modified
square wave like this:
__| |_ _| |_ _ [etc]
Not quite as bad as a square wave, but not good enough for shaded-pole
motors either. Air pumps run super with it though.
The APC Smart-UPS units are true-sine units though and should run any
aquarium accessory you have. They show up on Ebay a lot for cheap, but
usually with bad batteries. Digikey (http://www.digikey.com) carries exact
replacement batteries from the Panasonic line for APC UPSes if you want to
replace them. I've repaired 20+ APC Smart-UPS units like this.
The usual rule of thumb is cheap UPS = non-sine, expensive UPS = true sine.
>So it actually worked for you? I didn't have the same luck a few months
>back when I tried the same thing with a few of my UPSes. I have a large
>1250VA APC Back-UPS unit that I was going to hook up to my small
>nano-reef tank. Unfortunately, none of my water pumps nor the CF light
>ballast would accept the power supplied by the UPS when it was on
>battery. The lights would flicker and the ballast would crackle, and
>the pumps would clatter and make unhappy noises. I'm assuming this is
>because of the pseudo-squarewave output of this particular UPS not being
>compatible with things like flourescent ballasts and magnetic pumps.
>Perhaps the UPS you used has a more sinewave-like output? I seriously
>like the idea of having backup power on my aquarium equipment
>(especially the reef!), but none of my UPSes would work. They are all
>easily large enough to handle the load, but they are all APC Back-UPS
>units which probably all have the same squarewave output.
UNIX Systems Administrator