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Thread: Tank Circuit Question

  1. #1
    Newbie
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    Tank Circuit Question

    ok i have and and but only found a couple of posts which didnt explain to me entirely what i wanted to know

    i have the opportunity to add a second battery for sound and carpc equipment.

    found FAQ: Tank Circuits (Adding a Second Battery) and read through it and the linked articles but i am not sure i fully understand the schematic shown here

    i want to have the second battery charged by the alternator when the main battery is fully charged (i drive quite long distances if that helps)

    the schematic shows two batteries with diodes and resistors but i am not sure how they connect properly.

    can anyone show me a simple picture of their setup with maybe some labels so i can understand this properly.

    thanks

  2. #2
    MySQL Error jcdillin's Avatar
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    What size is your 2nd battery going to be? If your going to be adding a 2nd car battery then you just need a battery isolator and thats it.
    肚子笑痛了
    S60 Install

  3. #3
    FLAC
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    Quote Originally Posted by Turbosatan View Post
    ok i have and and but only found a couple of posts which didnt explain to me entirely what i wanted to know

    i have the opportunity to add a second battery for sound and carpc equipment.

    found FAQ: Tank Circuits (Adding a Second Battery) and read through it and the linked articles but i am not sure i fully understand the schematic shown here

    i want to have the second battery charged by the alternator when the main battery is fully charged (i drive quite long distances if that helps)

    the schematic shows two batteries with diodes and resistors but i am not sure how they connect properly.

    can anyone show me a simple picture of their setup with maybe some labels so i can understand this properly.

    thanks
    For a 7AH battery all you need is a Diode and a battery. And MBR3045 or whatever will work just fine. You put the diode between the car battery and the tank battery. You don't want too many diodes.

    The only risk you have is the max charge current. A small power resistor can limit that but will also limit your power into the computer from the alternator.

    Jeff
    MPEGBOX - Plexiglass Computer
    www.mpegbox.com

  4. #4
    Newbie
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    i am just adding a second car battery

    so what would you recommend as a good ql battery isolator?

    do i connect the pos to pos terminal with a resistor in there ?

    where in the circuit does the diode go ?

    or do i connect pos to neg ?

    could you please explain the exact connections including part numbers for components please

    many thanks this is a big help

  5. #5
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    If your using a 2nd car battery then you dont need any resistors or anything like that. The only thing you need is a battery isolator.


    maybe this picture will clear things up.


  6. #6
    Low Bitrate PSYKO_Inc's Avatar
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    Just search ebay for a battery isolator. You will want an isolator that can handle the same or higher amperage that your alternator will put out (for safety reasons). For example, if your factory alternator is capable of putting out 100 amps, you want an isolator that can handle at least 100 amps. If you're planning on an alternator upgrade later on, get a higher capacity isolator now so you don't have to buy a new one when you upgrade the alternator.
    -Jay

    1997 Chevy S-10, ext. cab
    CarPC Progress: 75% - Functional, but not quite finished.
    Check out my progress.

  7. #7
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    great that has explained it clearly for me

    thanks a lot everyone

  8. #8
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    i have looked on ebay and farnells website quite a lot and can only seem to find quite pricy isolators or isolators which simply cut off the battery from the car for fails safe reasons

    can anyone suggest a specific model or give me a model number to search for on farnell. and give me an idea of what sort of price is reasonable to be expected to pay

    i am based in uk

    thanks

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