Question about second battery and isolators

[boddy 10+ year member]

I'm going to be running 2600wrms and pulling around 275A. I am aware that i need to install another battery but i have a couple of questions that i cannot find an answer to.

I'm running OFC 0 gauge rated for 350A but to be safe I've fused it to 300A, should the amount of current flowing in between the 2 batteries be alot higher than what your drawing from the second battery? In other words will i be ok with 1 run of 0 gauge linking the 2 batteries or will i need more?

Also my second battery will be only be connected to my amps, if that's the case i don't see why you would need to ground it to the chassis. If you run a ground wire to link the 2 batteries alongside your power wire then when my ignition is on the second battery is able to receive a charge and when its off my amps and my second battery is a complete separate circuit from the rest of my cars electronics. If you run a ground wire then why would you need to ground it to the chassis aswell?

And lastly most of the isolators I've saw are rated for 200A does that mean it effectively fuses the wire for 200A? The only one I've found is the Stinger SGP35, is there any cheaper isolators that will do just over 300A?

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[knotdrummer88 10+ year member]

samsies. I wish i could answer this, but i too would like to know the answer to this

 

[boddy 10+ year member]

If someone could just give me an answer to if i would be ok with just 1 run of 0 gauge i would be very greatfull as i am rewiring my car on the weekend.

 

[disturbed471985 5,000+ posts]

1 run will be just fine assuming its ofc. Usually tru ofc is rated atleast to 300mps..

 

[NT_Hardcore 10+ year member]

one run should be fine. if your dead set on running the iso (guessing u plan to play with the car off?) i hope u have some kind of monitoring on that back circuit while the car is off-

 

[boddy 10+ year member]

Yeh i will be playing it quite allot with the car off. And i'm going to install a voltmeter on the second battery and run it to my dash.

 

[disturbed471985 5,000+ posts]

Yeh i will be playing it quite allot with the car off. And i'm going to install a voltmeter on the second battery and run it to my dash.

Unless ur going to have a bank of batts you want be playing it to long with the car off..

 

[boddy 10+ year member]

Around half an hour maximum but i'm installing a voltmeter so i will be able to measure the batteries charge.

 

[disturbed471985 5,000+ posts]

^^^ u want get 30mins of play time I assure you. Playing with your car off is just asking for trouble but to each their own..

 

[winkychevelle 10+ year member]

just be sure you ground are solid and 1 run will hold you. but for 30min play time i suggest at least 1 more additional batt if not 3 more. this is like playing with fire running off battery power.i suggest a good out-board battery charger if u are going to be doing alot of park and play at shows and what not.

 

[NT_Hardcore 10+ year member]

i agree with these guys

 

[boddy 10+ year member]

Will 275A really drain a battery that quick?

So when i rewire my car on the weekend install 2 runs of 0 gauge, one positive one negative?

 

[disturbed471985 5,000+ posts]

U might get a song in "maybe".... Hopefully ur amp will protect itself before you smoke it..

 

[boddy 10+ year member]

Looks like i'm bumping with my engine on and only on lol.

We are talking with my system maxxed aren't we? Surely it will be fine for casual listening.

 

[disturbed471985 5,000+ posts]

If my radio is on my car is on. Gas is alot cheaper then a new amp..