[time-nuts] HP-105B Battery Replacement?
paulswedb at gmail.com
Thu Sep 15 18:54:25 EDT 2016
APC has made UPS that take both internal and external batteries.
My house runs on a 2KW APC in bad times and they seem to run just fine.
Granted the battery is a drop bigger then we are speaking of here and I use
a separate 55 amp precision charger. Love that telco stuff.
But these are the serious commercial grade units that I find surplus or
free. They use 48 volt packs. I was aware of the traditional run times on
many smaller UPS units so stay clear of them.
Suspect we have strayed away from the basic question so will stop this sort
On Thu, Sep 15, 2016 at 6:41 PM, Gary E. Miller <gem at rellim.com> wrote:
> Yo Jeremy!
> On Thu, 15 Sep 2016 15:13:59 -0700
> Jeremy Nichols <jn6wfo at gmail.com> wrote:
> > I'd like to find a UPS that uses an external battery. So
> > far I don't see such a thing--do they exist?
> Not in the store, but they are easy to make. I take consumer grade
> CyberPower sine wave supplies. Remove the expensive and wimpy 12V9A
> gells cells. Then I put two 6V deep cycle tractor batteries in a
> battery box and cable them into the UPS with #6 wire from old jumper
> cables. To make it nice and neat, I fuse it with inline 50Amp fuses and
> 50Amp DC connectors. Total cost about $200.
> I've been doing that for almost two decades and have 6 running now.
> I'll get two or three hours of backup from them. Two weeks ago I had a
> 45 minute power outage, my network never hiccuped. The batteries need
> replacing about every five years.
> APC UPS can't handle the longer runtime, but never had a problem with
> any version of CyberPower.
> Just be sure that everything you need to stay up is on a UPS, and that
> they are well within their load rating.
> I can post pictures if anyone wants.
> 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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