On Wednesday 17 March 2004 01:03 pm, S.R.Glasoe wrote:
On Wednesday 17 March 2004 09:36 am, Hylton Conacher (ZR1HPC) wrote:
Before you all jump up onto the phone and send me a UPS, I would be interested in getting hold of the circuit diagram for such a APC unit. That way I can make it up myself over time and save a fortune.
Hylton Conacher
Do a Google search on home made UPS systems. Deep cycle marine battery(ies), voltage regulator and charging circuitry are the main ingredients. If you take basic safety precautions and get help where you aren't certain of what to do you can build your own UPS system for a reasonable price. Especially since you can buy the batteries at reasonable prices.
An example: http://www.markbrown.com/ups.html is an example of a high-end/high-$ setup.
Stan
"Deep cycle marine battery(ies), voltage regulator and charging circuitry are the main ingredients." . . . . . and don't forget the inverter!!! Look, I too am an electrical geek and if you wanna build one because you think it might be a cool thing to do and you might learn something, then that would be a good excuse. ;-) But take it from someone who's been designing switchmode power supplies for maybe ten years now (maybe 20) that you aren't gonna save ANY money by building your own <g> I bought a 650W APC unit for about 250 bucks (several years ago; they're even cheaper now) and at least 50 bucks of that is in the battery. And that price includes the embedded processor and the software to make it talk to your box. I KNOW you gotta have more fun stuff to design, eh?? -- Tony Alfrey tonyalfrey@earthlink.net "I'd Rather Be Sailing"