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

Bob kb8tq kb8tq at n1k.org
Thu Sep 15 19:06:04 EDT 2016


Hi

They are very common when you look at server UPS or larger units. There are literally hundreds of models to pick between. Prices are from roughly $400 up to a few hundred thousand dollars per unit.

Bob

> On Sep 15, 2016, at 6:13 PM, Jeremy Nichols <jn6wfo at 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 <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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> 
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