There are plenty of UPSs available that can do pure sine wave output. Any of the APC SmartUPS line can, for example (all but two of my UPS units are either APC SmartUPS or APC SmartUPS RT--the RT being a true online, double-conversion UPS). I honestly swore off "stepped approximation" or "simulated sine wave" units when I saw that it wasn't nearly what I expected--I assumed it was a stair-like approximation to a sine wave. It isn't. When connected to a scope, it looks more like a square wave, except some time is spent at 0v to produce a RMS value equal to sine. Some PSUs tolerate this better than others, but I'd rather avoid it. Of course, they cost more, and a double-conversion more still.
Virtually everything I have is on UPS now. After a line of storms passed through, I lost power last night for just under 2 hours (maybe the second major power outage since I moved to the area over 8 years ago), and it was almost comical. Aside from it sounding like a beep factory test lab and some overhead lights going out, it was like nothing changed. I finished my TV show and went back to the PC. Comcast was out (and still is actually, they must have been hit), but my backup AT&T connection took over automatically. I have about 6-8 hours of battery runtime on my main PC. -----Original Message----- From: hardware-boun...@lists.hardwaregroup.com [mailto:hardware-boun...@lists.hardwaregroup.com] On Behalf Of Steve Tomporowski Sent: Saturday, October 12, 2013 3:34 PM To: hardw...@lists.hardwaregroup.com Subject: Re: [H] Good UPS's No, Duncan, no hot button. This was supposed to be a different threat (maybe I should have named it differently??), I don't need a UPS now, but I don't think we've discussed UPS's very heavily on the list. Just looking for other's experiences. APC wouldn't still be in business if all they had was crap. The cyberpower reviews I've read come down to a low number of initial problems, however, once there is a problem, they are slow to respond. That's similar to a lot of companies. I've never worked on inverters, so I can't say as to how difficult it is to supply a true sinisoidal waveform. One thought that does come to mind is whether a UPS can do power factor correction. Again, that's an area I haven't had to do anything in, so far. If you want a real 'hot button', ask me about PTC, the makers of MathCAD....;-) Steve On 10/12/2013 4:15 PM, DSinc wrote: > Steve, > I get it. You have a hot button. Fine. I'd be on the email, phone, > whatever, if the replacement ups is still doing the same sh*t! > Who knows? Maybe you got somebody else's bad ups back. I mean stuff > happens. > > I know not much about CyberPower. I'm still looking at them. They read > well, but, I'm not ready to drop their kinda dollars yet. Fine, just > call me a dweeb. I've given up on tripp-lite, junk! JMHO. > > I'll say this straight out! I do not trust any 'user reviews' on > newegg or amazon. Period. I know how they can be faked. And, I refuse > to try and track down someone who wrote a really 'good' review. I am > still waiting for Cyber Power to prove/discuss how they believe they > supply 'sinisoidal' AC power. I have seen nothing in the past 3 years. > But, I check in from time to time to look for updates. None yet. > Yes, this is a personal itch for me! I admit this. I'm just not ready > to test/try out Cyber PowerATM. > > Yes, I get that full sine AC is tough to do, but, I would have thought > that by 2013 somebody could step up and just do it. Maybe my wish is > still 'rocket science' but, I am suspicious. Can't say yea or ney. > Maybe Cyber Power is worth a look. YMMV. > Best, > Duncan > > Best, > Duncan > > On 10/12/2013 15:46, Steve Tomporowski wrote: >> Since the subject has been brought up, what's a good company/UPS to >> get? Right now I have two of the APC Back-ups line (XS 1000 and XS >> 1300). The XS 1300 has had a problem with USB from day one, so I'm >> not impressed with APC hardware, but I have experienced good customer >> service from them. They replaced the XS 1300 once, however, it still >> exhibits the same problem, dropping out and not detected. And, of >> course, the website blames every but the UPS itself (and the phase of >> the moon). >> >> Looking at Amazon and Newegg, I've noticed that Cyberpower gets high >> marks, much higher than APC, but there are also complaints on their >> customer service. >> >> Experiences? >> >> Thanks...Steve >> >
