well depends how BIG your amplifier your gonna be pushing.... PERSONALY if your wanting a HOME STEREO SYSTEM then AT LEAST BUY A HOME amplifier... PLATE amplifiers work great.... i have been using mine for almost 2years now and love it.. only 300watts but sounds great with my old 2 10inch subs i got in my room now.
BUT if you dont want to spend the money for a PLATE amplifier then IF ITS IN YOUR GARAGE.... simply buy a large car battery, a MONSTER BATTERY is the best id say.... but those aint cheap either! its not called monster but it is a monster battery. LMFAO its about the size of 2-3 regular car batteries.... you can buy them at most semi truck parts places and NAPA autoparts also carries them.... then just buy a battery charger.... wire up your amplifier and such to the battery and slap the charger onto the battery and turn on the charger while pumpen the beats...
VERY EASY and just simple.... then its simply a toggle switch to the REMOTE turn on wire on the amplifier and your golden.....
BUT DO NOT PUT A BATTERY INSIDE YOUR HOUSE!!!!!! the gasses that are released are not good for inside your house... but if its out in the garage where thiers ventilation and large enough area i see no problems.