[time-nuts] HP-105B Battery Replacement?

Jeremy Nichols jn6wfo at gmail.com
Thu Sep 15 18:13:59 EDT 2016


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 <kb8tq at 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 <jn6wfo at 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
> >>
> >>
> >
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