Old UPSs

On 28 Mar 2007 at 15:53, Tom Peters wrote: I've got a 1.4KVA Elgar supply that I've had for a very long time. Same story--it takes 48v of lead-acid gel cells. I got around that by constructing a separate box (out of wood) that holds 4 12v garden tractor batteries ($19 the each at the local big box--also keeps the fumes out of the electronics). If you wanted to splurge, you could opt for deep-cycle marine batteries, but we don't get long power failures very often, since the co-op moved the substation about a half-mile up the road. I check the water every time I have my teeth cleaned (6 month intervals) and replace them every 5 years or so. The big UPSes are very reliable in my experience--not like some of the consumer items. Cheers, Chuck