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Thread: battery isolator and alternator

  1. #1
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    battery isolator and alternator

    please help me that on what basis should i select a battery isolator and alternator. like what should be the isolator rating (like 120 Amp,90 Amp, etc.)
    i want to purchase an economical isolator and alternator. please recommend me some companies.
    thank you...

  2. #2
    North of the land of Hey Huns
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    What kind of vehicle do you have, what are you power requirements, and what is your purpose for needing an isolator/second battery? Start with answers to these, and perhaps we can assist you in picking out the right setup for your needs.

  3. #3
    Variable Bitrate dMand's Avatar
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    A battery isolator allows dc current to flow in one direction, but not flow in reverse. They're commonly used on vehicles where multiple batteries or battery banks are often required. The primary purpose for their use is to insure that a failure of a single battery or battery pack, will not wipe out an entire battery network.

    Such configuration is widely used in industrial vehicles; for example, like power utility boom trucks; as a fail safe method to lower the boom via DC current in the event that the primary engine fails to start, while the lineman is elevated in the basket.

    In my honest opinion, there is no use for such an elaborate battery setup for the average carPC user, provided that you select the proper components to begin with.

  4. #4
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    battery isolator

    i dont think you have heard about this car, this is maruti suzuki zen. and i want to power my car pc.

  5. #5
    Variable Bitrate dMand's Avatar
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    so why not purchase a DC to DC power supply from the mp3car store, and call it a day?

    Why do you need an isolator with multiple batteries to operate a carPC?

  6. #6
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    battery isolator and alternator

    because i dont want to recharge my single battery again and again. carpc will drain my battery soon... so i want to use multiple batteries so that my car has atleast sum battery power to atleast start.

  7. #7
    Variable Bitrate Uraijit's Avatar
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    I'm actually thinking of doing the same. The primary idea being that if you have the PC battery isolated from the car battery, you can use the suspend option to power your ram, without fear of draining your car's battery.

    Deep cycle batteries are best suited to the PC side of the system.

    Anyway, to answer the question. You don't need an upgraded alternator to run the second battery. As far as the isolator's rating, just get one rated the same as your car's factory alternator. Unless you're running a huge amp or something, you'll never max out your stock alternator. Especially not on the PC side of things. Your PC will probably draw 6 amps, max.
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