hi ya mike > > I changed the powersupply to be +24v-DC input instead of 110v-ac > > > > I use 2 car batteries...and pulled the 110vac... it stayed > > up for about 15 hrs..!!!! - with 1 IDE disk...-- just sitting > > there and running cron every 10 minutes to log how long it ran > > That'll work, but you have to be careful. The main problem with > lead-acid batteries is that they produce explosive gasses when they > charge. Keep the area well ventilated. It'll also tend to cause > corrosion on surrounding equipment. It's much safer to use > gel-cells.
yes...except gelcell batteries are just as expensive as a whole new UPS... and those things are only good for 10-20 minutes or there abouts... the experiment was: "How long is a car battery good for" - now the problem is how to keep the batteries properly charged - and yes...about ventelation and stuff... ( batteries in an outdoor shed or a generator ?? ..hummm....) - for those that don't want a generator...what's their options ? ---- $ 30x2 car batteries + $40x2 battery charger == 15 hours of backup... not too bad... - plus $170 for a off-the-shelf 24v-dc input powersupply have fun linuxing alvin