What size battery isolator for dual battery set-up ??

[cichlid_baby 10+ year member]

I have two Optima batteries, one red, one yellow.

I also have upgraded to a 200 amp alternator.

What size battery isolator do I need? These things can get expensive, so I don't want to overspend if I don't have to.

Thanks!

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[justin smith 10+ year member]

no isolator imo... i dont have one

 

[plugitin 5,000+ posts]

no isolator imo... i dont have one

x2

 

[DBBOOM 10+ year member]

Waste of time, only good if you are running for extended periods of time with the vehicle off. Also, they will ISOLATE your batteries when on, which defeats the purpose of paralleling you batteries to begin with. Save your money.

 

[cichlid_baby 10+ year member]

I thought it was a good idea to use battery isolators to keep one battery from discharging the other battery due to low voltage.

I have a dedicated starting battery, and then a battery for all of the auxilary stuff such as amps, lights, winch... etc.

You really don't recommend using an isolator?

 

[groundpound4200 5,000+ posts]

I dont in my vehicle either.... if you're driving the car eveyday I wouldnt worry about the batteries discharging. If it was being stored then I might throw one on or better yet, just disconnect the battery

 

[Bobby322 10+ year member]

I was told I needed an isolator since im running a different battery in the back, or else it would burn up my batteries.

 

[jco1385 5,000+ posts]

i have a rt and a yt, no isolator. resting at 12.5v+ and no problems.

 

[IMOVeCHICKENS! 10+ year member]

i use a 200 amp isolater on 2 runs of 0 gauge and a stock alt to my spv44 in the back works fine full tilt my voltage stays from 11.8-12.5

 

[7ender 10+ year member]

I was told I needed an isolator since im running a different battery in the back, or else it would burn up my batteries.

You were told wrong.

Been running two drastically different batteries for well over a year now. No problems, and resting at 12.6.