back up batteries for car audio and tvs

[crx]

hello.. New to this.. i have a 88 honda crx.. i have a 3000 watt amp running 1 12" db sub and have a 1000amp power inverter for my xbox, 42" tv and 2 7" monitors.. i have my stereo hooked up to my small honda battery and have to run the car or else it dies in 20 min..my tv, xbox and 2 monitors i have an external battery from my work truck not hooked up to any power supply to the car and it lasts 2 hours .. how can i run everything together?.. at car shows mostly tv ect is on and car is not running.. would like to get 4-5 hours out of a battery if that is possible with out starting the car.. thanks so much for your help in advance

[WalledSonic]

Im jealous of your 88 crx. I would track it if i had one haha. You could invest in lithium battery to save on weight. Thats a small car to add a lot of battery. 

EDIT: since you made no mention, i'll assume you havent upgraded your alternator yet? Step #1, get the largest alt you can. 

[crx]

hi WalledSonic, thx for your reply.. i was informed by an alternator rebuilding shop that they could not rebuild the alternator to carry more current or carry a bigger alternator for the crx

 

[crx]

just found alternator on ebay.. 135 amps 0r 170 amps to do this project?

 

[MrSkippyJ]

Not sure how am alternator is gonna help if the car is off. You need a battery bank that is separated from the rest of the system and the ability to charge it from an external source. Also don't buy eBay alts.

[crx]

Thx Mr SkippyJ. what do you suggest for a separate battery bank, size and brand names?. if i can get it to run for 5 hours i can charge it at home after the show with a battery charger

 

[ChevyBoy95]

Ever think about a small generator?