They do exist. I've seen them in service at Telecom sites outside of the U.S. and Canada. I believe there was a thread re this a few years ago ?
Sent from my iPhone > On Sep 15, 2016, at 3:13 PM, Jeremy Nichols <jn6...@gmail.com> wrote: > > Since I have a 12V 100 A-H gelled electrolyte battery as a > short-term backup (for those outages not worth firing up the generator), > I'd like to find a UPS that uses an external battery. So far I don't see > such a thing--do they exist? > > Jeremy > >> On Thursday, September 15, 2016, Bob Camp <kb...@n1k.org> wrote: >> >> Hi >> >> It’s been quite a while since I bought anything other than a pure sine >> UPS. They really aren’t as expensive >> as they once were. You may find them a bit cheaper from outfits like >> CyberPower than from APC. Sometimes >> it s a bit tough to work out exactly what is or is not a pure sine wave >> unit. If you want a full “always on” pure >> sine device, they are still a bit expensive. >> >> Bob >> >>>> On Sep 15, 2016, at 2:13 PM, Jeremy Nichols <jn6...@gmail.com >>> <javascript:;>> wrote: >>> >>> Your point is well made. My question is: what happens to the quality of >> the output sine wave if I use anything other than a true sine-wave (i.e., >> expensive) UPS? Most of them these days produce a semi-sine wave (aka >> modified square wave) that may or may not play well with the 105B. Anyone >> have experience? >>> >>> A external battery and appropriate chargers and cabling does sound like >> another good alternative. Harder to move around but I don't (yet) have such >> a need, only that the 105B stay "on" regardless of power failures. >>> >>> Jeremy >>> >>> >>>> On 9/15/2016 10:15 AM, Bob Camp wrote: >>>> Hi >>>> >>>> A bigger question becomes: >>>> >>>> Do batteries inside equipment make much sense anymore? >>>> >>>> These days, a UPS is often a standard part of a rack in an outage prone >> area. Powering >>>> the “whatever” instrument off of the same UPS as the rest of the stuff >> is one obvious >>>> answer. >>>> >>>> The other answer is an even older approach. Use a battery bank that is >> external to all >>>> the gear in the rack and tend it independently of each box in the rack. >> That way you have >>>> a few very large cells to worry about rather than a whole bunch >> scattered about. Things like >>>> lead acid that are impractical in a piece of gear are more of an option >> in an independent >>>> battery box. A single charger / line supply makes it easier to invest >> in something with real >>>> smarts in it. The advent of dirt cheap isolated switchers makes the >> conversion to instrument >>>> voltages a lot easier than it once was. Pick a common voltage like 12, >> 24, or 48V and run with it. >>>> >>>> My answer to the frequency standard battery pack question has become >> “don’t do it”. It makes >>>> them a *lot* lighter weight !!! >>>> >>>> Bob >>> >>> _______________________________________________ >>> time-nuts mailing list -- time-nuts@febo.com <javascript:;> >>> To unsubscribe, go to https://www.febo.com/cgi-bin/ >> mailman/listinfo/time-nuts >>> and follow the instructions there. >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com <javascript:;> >> To unsubscribe, go to https://www.febo.com/cgi-bin/ >> mailman/listinfo/time-nuts >> and follow the instructions there. > > > -- > Sent from Gmail Mobile > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
