Hi Any time you get into UPS designs, they are all over the map …
> On Sep 16, 2016, at 1:01 PM, Gary E. Miller <g...@rellim.com> wrote: > > Yo Hal! > > On Fri, 16 Sep 2016 00:50:56 -0700 > Hal Murray <hmur...@megapathdsl.net> wrote: > >> g...@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”. Bob > 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. > > RGDS > GARY > --------------------------------------------------------------------------- > Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703 > g...@rellim.com Tel:+1 541 382 8588 > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.