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.