That said, for my own use, I've got a 100Ah LFP from Blackwood Innovations for my ham hear; BioEnno has units all the way up to 300Ah for the deep-of-pocker.
On Thu, Aug 31, 2017 at 11:35 AM, Tox <[email protected]> wrote: > 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 < > [email protected]> 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:[email protected] >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> Message delivered to [email protected] >> > > > > -- > Scott Small > > > > -- Scott Small ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
