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 ...
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 ...
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 ...