On Wednesday 03 June 2009 06:32 pm, David Kaiser wrote: > You're saying there is an option to not using sine wave? Aren't sine > waves the crux of alternating current? I have no idea if there is > any usable products or devices that work against square wave power - > do you have some firsthand knowledge of this?
Why of course <smile>. The most interesting answer is in the link at the bottom of this post, but ... All consumer-grade UPS products I know of are stepped square wave; an example is here: http://www.samsclub.com/shopping/navigate.do?dest=5&item=362641 Why they don't say anything about it on the page above, you can read about it here: http://www.apc.com/resource/include/techspec_index.cfm?base_sku=BN1250LCD Notice they say: <snip> Stepped approximation to a sinewave </snip> Which is what I call a "stepped square wave". > Are these square-wave products cheaper or something? Much cheaper. The 1250VA unit I linked to above costs $129.68 at Sams Club. A Similar 1500VA Smart-UPS (true sine-wave) here: http://www.apc.com/resource/include/techspec_index.cfm?base_sku=SUA1500&total_watts=50 (I couldn't find a 1250VA comparable Sine-wave unit; perhaps I didn't look carefully enough) ... costs $560 plus shipping (and they're heavy; this one has a shipping weight of 60 pounds). > For those of us that are not data-center junkies, can you provide us some additional information? I just now found this: http://www.kerchner.com/electrical/sinewave.htm and though written in '85, it appears to be something I can trust today. So the answer is I can certainly go ahead and get a cheap(er) stepped square wave UPS. I hope this has been as instructive for those of you who've read and replied as it has been to me. So I'm going to look through my store-room tomorrow to see if I have another UPS I can run if we continue to get thunderstorms and power outages. Otherwise to Frys to see what they've got to compare with Sams Club. Thanks for the input; the research to reply helped me find the answer. <smile> Jeff -- Jeff Lasman, Nobaloney Internet Services P.O. Box 52200, Riverside, CA 92517 Our jplists address used on lists is for list email only voice: +1 951 643-5345, or see: "http://www.nobaloney.net/contactus.html";
