im ordering a new battery and i know i need a isolator, but my question is how powerful do i need it to be, some are like 200 amps while others are 500+

and can anyone reccomend a good battery for like 1500 rms?

 

just hook them in parallel **** the isolator

 

just pm'd u like 5 seconds ago, but damn it looks like im going to be spending like 75-100 on terminals and disb blocks

 

Really?
Is that how yours are running or is it a whole different story when you switch to a 16 volt system.

Brickloaf- I'd upgrade the Alt before I put another battery in. One good battery can handle the system as long as the alt can keep it charged.
If you put another battery in then your alt with have to work twice as hard to keep them going. If its already under strain due to the system then this will only add to the problem plus for 1500 watts I don't really think a second battery is needed IMO

 

yup mine are in parallel as long as you drive the car often its the best situation. you normally loose 1v+ running thru the isolator alone and if your fully draining a battery something is wrong anyway. the isolator would just cover that up

 

should i jsut take out my stock battery and replace it with a audio grade one? instead of running 2

 

well 2 batteries are normally better then one but is always 100% better to have 2 of the same batteries. If you have one good one and one trashed one its worse then just the one good one.