For pickup: VAX-11/750 and RK07

On Saturday 06 June 2009, Chuck Guzis wrote: There's really only 3 reasons I bother upgrading my UPSes whenever I can find a newer, cheap to free one: 1) Newer models seem to have a charging circuit that's smart enough not to overcharge nearly-dead batteries to the point at which they expand and blow their seals. Cleaning batteries that have done this out of a UPS runs somewhere from "difficult" to "a complete mess". And, I've had to clean this up several times out of UPSes I've received; the only good thing is that it usually makes the UPS much less expensive to acquire. :) 2) Higher-efficiency inverters mean more runtime out of the same batteries, and usually at the same time, a lighter UPS. Considering how often I seem to move stuff around, lighter is definately a plus. 3) Better monitoring. I really like the amount of information that I can get out of SNMP on a modern UPS's network card. That said, if you replace the batteries as recommended (3-5 years) with good quality batteries, an older UPS will do quite admirably for most people, and can be more useful for hacking up to do different things (like mashing three of them into being a 3-phase inverter, which is somewhere on my project list, to power stuff like my IBM 3420, and Liebert System/3). Pat -- Purdue University Research Computing --- http://www.rcac.purdue.edu/ The Computer Refuge --- http://computer-refuge.org