-------- Bill Notfaded writes: > > Can't I just use a high quality APC backup power system like we use to > power racks of gear in our Telco and compute closets?
Very few UPS's are good at long-run applications, they are typically built to run a heavy load for minutes, not a tiny load for hours or even days on end. That means low efficiency, 75% net efficiency is considered good, and it goes totally south the further you are from the name-plate load, because the constant overhead is large. Some UPSs dont even have a thermal design allowing 24*365 operation. If you want to power mains kit from batteries, it is usually better to get a "real" inverter which is built island-grid applications. But for powering small loads, OCXO's, GPSDO's, Rb's, fire alarms, emergency lighting etc, the overhead of going from battery voltage to mains voltage and back is just a unnecessary loss. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 [email protected] | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
