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

[Mark Spencer]

In my experience the commonly seen UPS's that support external batteries expect you to use the batteries supplied (or at least specified) by the manufacturer.    

That being said I have come across UPS systems that are designed to work with generic user supplied 12 volt batteries but in my experience they are much less common.  Some of them even have adjustments to provide different charging voltages for different types of batteries.

Sorry this is getting a bit off topic.

All the best
Mark S



Sent from my iPhone

> On Sep 15, 2016, at 4:06 PM, Bob kb8tq <kb8tq at n1k.org> wrote:
> 
> 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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