Originally posted by: Buz2b
Originally posted by: VirtualLarry
Originally posted by: Mermaidman
Hmm--The UPS looks tempting. Haven't seen a deal for one of those in a while, and I need one.
It's only a 350VA, you might not want to bother. That would be ok as a secondary UPS to power computer accessories like an inkjet printer, cablemodem, router, etc., but not for a decently-powered primary PC these days. Go for something at least 450-500VA. Either that, or connect nothing but the PC to it (no monitor, no accessories), and make sure to shut your computer down as soon as you lose power for more than a few seconds, because I doubt that UPS would hold up for more than 1-2 mins at most.
Actually, I have a 350 VA model (similar model) and I just plug my 19" CRT and tower into it. If the power goes out I have it set to automatically shut things down after one minute. The rest of my equipment (printer, router, cable modem, etc) are all plugged into a separate surge protector. I've had probably three power loss situations and each time it has worked just fine. No, you can't expect it to run things for 10 minutes and if that's what you want, look elsewhere. But as long as you have the software installed that shuts things down fairly quick, it works like a champ.
Hmm, really. I'm a bit honestly surprised that it will handle that load, but if it works for you, then great.
I'm not a UPS expert, but my understanding is that the actual power that it can supply to a load (your PC), in terms of Wattage, is somewhat significantly lower than the VA rating, because of "power factor" issues. (I'm not an EE, so I can't describe it in any more detail than that.)
I've used a "280 VA" APC unit, and it would get overloaded, just running my basic system (tower + monitor), so I was guessing a 350VA might not be that much better. I'm currently running a 450VA Tripp-Lite unit. (Which was later re-rated at 500VA by the company for reasons I don't fully understand. Their "Internet Office 450" model became the "Internet Office 500". Maybe it had a change in components or was initially slightly over-spec'ed.)
As a general rule of thumb, I figure that you need a 500VA unit for a 350-400W computer load. (Any EE's out there,
please correct me if I'm off.)
By that rule of thumb, I personally reserve "lesser" UPS for secondary power back-up duty, for smaller "junk" PCs, and various external devices connected to my PCs and network.
I get about 4-5 minutes of runtime, but one time I made the mistake of shutting off the monitor while I was running on battery power, and then turned it back on again. My 15" Compaq CRT does a de-gauss on power-on, and the surge current from that overloaded the inverter on my UPS and shut it down cold, killing power to my PC in the process. Bad idea. :|
Whatever anyone does,
don't connect a laser printer to a UPS. It usually says that on the box, but it's a very good thing to remember.