Running system on battery only 2k watts+

Anyone play there system for 30 mins+ on batteries only? and stay @12volts + on 12 volt batteries

2000watts + in bass alone whats you setup?
im just asking i have setup and played 800+watts systems on stock battery for 30 mins + that's nothing compared to 2k bass alone not counting nearly 500 watts for mids/highs..

i used to be able to do like 20 mins id see high 11s

nope, my car is always on.