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

Bob Camp kb8tq at n1k.org
Thu Sep 15 17:32:34 EDT 2016


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. 


> On Sep 15, 2016, at 2:13 PM, Jeremy Nichols <jn6wfo at gmail.com> 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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