There are also UPSes meant for extended runtimes that are a little less brutal on the batteries. One Upon a Time, I had a couple racks of APC SmartUPS 2000 units with daisychained batteries to give extended holdup to a couple of racks of telecom and server hw. No clue how RF noisy those units are, though.
On Thu, Aug 31, 2017 at 10:46 AM, Lynn W. Taylor, WB6UUT < kx...@coldrockshotbrooms.com> wrote: > I'm going to add that nearly every UPS made is meant to bridge the time > between when the power goes out, and the (automatic) generator starts. > > If you don't have a generator, the UPS signals the computer(s) so that > they can shut down gracefully and turn the UPS off. > > The (typically AGM lead-acid) batteries are sized for maybe 15 minutes, > which is way too fast. Drawing a lead-acid battery flat in 15 minutes will > kill it in only a few cycles. > > What I did as part of my ISP was to remove the batteries from my UPSes and > replace 7 or 12Ah batteries with 100Ah batteries outside the case. > > That didn't get me to the 10 hours for maximum battery life, but it got me > to 8 hours..... > > Jim's suggestion also lets you size the battery to run all the gear for > more than a few minutes. > > 73 -- Lynn > > On 8/30/2017 8:55 AM, Jim Brown wrote: > >> A FAR better way to provide UPS for radio gear is a 12V deep discharge >> lead acid battery or 14.4V LiFePO4 that is float charged by a suitable >> power supply. And as has been discussed several times, LiFePO4 batteries >> have the major advantage that their operating voltage stays above 13V for >> most of their discharge curve, while lead-acid batteries are below 12V for >> most of their discharge curve. This system is as quiet as the power supply >> used to float-charge the battery. >> >> With either battery type, care must be taken to not overcharge the >> battery. >> >> 73, Jim K9YC >> > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to scott.sm...@gmail.com > -- Scott Small ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
