How do u install car amplifier at home?

Didn't know your amp was so big.  Gets expensive with efficient power supplies

http://www.jameco.com/cgi-bin/ncommerce3/ProductDisplay?prmenbr=91&prrfnbr=346836&cgrfnbr=780&ctgys=503;528;780;

Me and a friend of mine toyed with the idea of running his two kappa perfect subs off of his Rockford 800a2 amp in his dorm room a couple years ago, but after lots of research and asking around, we determined he was gonna need one hell of a power supply.  Luckily your amp does not draw 70 amps peak current, cuz if it did you'd probably be looking at a $500 or $600 power supply, AT LEAST.  The power supply that pinchy suggested above will do you just fine and it should give your amp good clean power.

The battery idea, though possible, I would highly recommend against.  For one thing, unless it's a gel cell or sealed battery, it will give off hydrogen gas whenever it's charged.  In case you don't know, hydrogen gas is FLAMMABLE and it's also not the best thing to breathe on a regular basis.

In order to charge the batteries at the same time that they're being used to power the amp, you'd also need a battery charger that's designed to charge a battery that already has a load on it.  This would likely end up costing you a LOT more than that 40 amp power supply that pinchy suggested.  Plus the power supply isn't flammable!

Yeah, I think the supply I suggested automatically detects the input power.  The specs say

Input voltage: 100-240VAC@50-60Hz