UPS & Car Battery

[prosenjit]

I want to replace my UPS battery with a car battery (13 palates), details:
I want to connect a 12 volt 120 AH lead-acid car battery with my existing 500 VA UPS, for very fast switch over and long backup time during power failure, i also have an 400VA inverter which i want to use for charging up the car battery. Now question is will the UPS able to draw required power from 12v battery to run my PC.
I am trying to do so because my inverter is not so fast as the UPS in terms of switching over. And UPS back up time is 15 muintes only where inverter and this battery backup time more 3 hrs,



17" AOC monitor, 1.7 ghz p4 cpu

 

[sniperchang]

Sounds like a cool ideal.

Does your UPS have an 12V input or something?

 

[The_Other_One]

I'm pretty sure that'll be just fine as long as the voltages match up. I know with normal DC circuits, you can use as many amps as you want without a problem, as long as the volts match.