I have just had a most unfortunate experience with a UPS and when Gary said he had an old UPS he was considering, I shuddered. As far as I know, older UPS units overcharge the battery continuously. The best "problem" this seems to cause is having to replace batteries every three years or so.
In my case, the battery not only was overcharged, but the UPS died in such a fashion that the 117 AC was interrupted several times and that killed my computer, which it was supposed to protect. I know the house current did not flicker or drop during the time. It was strictly the UPS. I have replaced it with a modern unit that has a selectable "float voltage" for several types of backup batteries. In my case I selected a 100AH deep cycle AGM construction unit. If the house supply goes down, it switches to a 60 Hz inverter (pure sine wave) in 10 ms. It has a monitor panel that shows me the condition of the battery. Nothing is fool proof. But I hope that this more modern design can help me avoid this sort of catastrophe in the future. Just my 2 cents' worth. 73, Dave, K4TO On Thu, Feb 22, 2018 at 12:32 PM, Jim Brown <[email protected]> wrote: > Virtually all UPS units include MOVs, so have all of the destructive > possibilities of MOV power strips. If you're going to use a UPS (and I do), > it should be plugged into a shunt-mode surge protector (SurgeX, Zero Surge, > or Brick wall). > > 73, Jim K9YC > > On 2/22/2018 9:10 AM, Gary Smith wrote: > >> I have an older Staco Energy UPS I've >> never used, bought it at Dayton a couple >> years back. Weighs a ton from the lead >> acid batteries inside, need to put another >> plug on it, it comes with a 30 amp 120V >> plug and the house wiring doesn't support >> that. I need to find an owners manual for >> it as well, looks like there is a USB port >> involved & it didn't come with a manual. >> After getting the whole house protector I >> should probably attach this to the stereo. >> > > > ______________________________________________________________ > 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] > ______________________________________________________________ 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]
