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

Bob Camp kb8tq at n1k.org
Fri Sep 16 13:07:16 EDT 2016


Any time you get into UPS designs, they are all over the map …

> On Sep 16, 2016, at 1:01 PM, Gary E. Miller <gem at rellim.com> wrote:
> Yo Hal!
> On Fri, 16 Sep 2016 00:50:56 -0700
> Hal Murray <hmurray at megapathdsl.net> wrote:
>> gem at rellim.com said:
>>> APC UPS can't handle the longer runtime, but never had a problem
>>> with any version of CyberPower.   
>> There are two parameters for UPS boxes.  One is the power the
>> electronics can handle.  The other is the amount of energy the
>> batteries can hold.
> You can change up the batteries for more runtime, but real cheap UPS
> will overheat and die.  They were not designed for steady state
> operation.
> That is the problem with the cheaper APC.  They were designed for 5 or
> 10 mins at max power.  Run them for two hours at max power then they
> overheat and permanently fail.
>> I think some of the smaller units have inadequate cooling to run at
>> rated power for long, but their batteries are small enough so that
>> they run out of power before the electronics overheats.
> Nothing to do with size.  I have seen this in big and small.
> The other thing is whether there is a transfer switch, or the UPS is on
> continuously.  The APC tend to switch the batteries and DC/AC converter
> online only when needed.  OTOH, the CyberPower run from the batteries
> all the time.  

Certainly some do. The ones I have do not. You take a pretty significant 
efficiency hit when you go “full time DC”. 


> The transfer glitch can be quite large and affect the
> load.  So the float type UPS tends to give smoother power more of the
> time.
> ---------------------------------------------------------------------------
> Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
> 	gem at rellim.com  Tel:+1 541 382 8588
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