multiple batteries

[DeepMag1c 10+ year member]

I Heard that u lose voltage when u use a battery isolater...is this true? If so whats a better way of hooking up 3 batterys (all 3 batteries will be the same)?

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[forbidden 10+ year member]

You do lose a minor amount of voltage when using an isolator, that said though, I would rather lose a little voltage and know that my car will still start. Running 3 batteries is going to put quite a strain on the alternator, can the alternator handle this?

 

[DeepMag1c 10+ year member]

is a 160 Amp alt enough?

 

[forbidden 10+ year member]

My question is as to why you think you need 3 batteries. In 99% of the cases 3 or more batteries will give you extended playing time with the ignition off and not much benefit at all with the vehicle running.

 

[Mr. Loki 5,000+ posts]

What kinda of batteries? No your alt is not big enough! What are you in need of 3 batteries for then we can perhaps help you better. A optima yellow top under the hood or 2 under the hood is VERY sufficent for any case other thing big time competitors. If you get a 200amp alt you can build a battery tray and run them under your hood or get a batt iso and run 1 in the front and 1 in the rear and I assure you should have enough power.