2
votes
0answers
69 views

Is it possible to charge 3 parallel batteries without sending charge to the UPS?

I have a UPS (uninterruptible power supply) with a 220VAC input designed to be used with 12V batteries. It has a rated capacity of 400 watts and I've placed three 12V car batteries in a parallel ...
5
votes
4answers
601 views

I want to build a DC powered computer, what are the gotchas, where are the parts?

Google builds its servers with a Battery in the box so that they don't need a UPS. I'm wanting to do the same, but I'm wondering what all the gotchas might be for doing this, and where I'll find the ...
6
votes
5answers
6k views

12V DC UPS for Network Equipment

Many times we want to kept running low power devices like DSL modems, etc. Most of these devices take 12V/9V DC so why to use ordinary UPS which convert AC to DC to AC, lots of conversion lots of ...