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Can you disconnect the a/c from the alternator?

This is a discussion on Can you disconnect the a/c from the alternator? within the Talk Car forums, part of the Tech Support Forum category. Hello All, I am trying to take my car a/c load off the alternator, by powering the a/c from a


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Old 07-25-2012, 06:13 PM   #1
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Hello All,

I am trying to take my car a/c load off the alternator, by powering the a/c from a battery bank.
I know the a/c pulls alot from the alternator, so I'm trying to free up some horsepower.

Question 1- Can I power the a/c from a battery bank?

Question 2- Could I make a switch from the alternator to the a/c to divert getting power from the battery bank or power cell?

Thanks for the input!
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Old 07-25-2012, 08:51 PM   #2
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It COULD be done...but it will take a lot of batteries.
The amount of horsepower you'd gain by doing this would be so small it would hardly be noticeable.
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Old 07-26-2012, 06:21 AM   #3
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The A/C clutch does not pull many amps, it is the compressor running that hurts HP, from the engine.

They used use vacuum switch that controlled the A/C clutch. Stick you,foot in it the vacuum drops and disconnects the A/C compressor clutch.

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Old 07-26-2012, 12:09 PM   #4
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Huh? What do you mean the "a/c pulls a lot from the alternator"? A/C compressors are generally mechanically driven by a belt from the engine. What are you driving? Does it really have a compressor that is powered by an electric motor? The a/c compressor does have an electrical clutch but that is not a huge load... certainly not something one would go out of one's way to power from batteries.



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Originally Posted by matt3607 View Post
Hello All,

I am trying to take my car a/c load off the alternator, by powering the a/c from a battery bank.
I know the a/c pulls alot from the alternator, so I'm trying to free up some horsepower.

Question 1- Can I power the a/c from a battery bank?

Question 2- Could I make a switch from the alternator to the a/c to divert getting power from the battery bank or power cell?

Thanks for the input!
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