More rookie problems ! wrong batteries

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Xenergiserx, Sep 21, 2021.

  1. Xenergiserx

    Xenergiserx Light Load Member

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    So i bought 4 interstate cca flooded batteries. My truck has an apu so I got 4 deep cycle marine batteries rated at 800 cca.
    Didn’t know that it was all one system and all the batteries are connected.
    I can’t return the deep cycle since returning period expired.
    Will truck run fine or will I kill the batteries?
     

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  3. truckdriver31

    truckdriver31 Road Train Member

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    why boat batteries anyway.
     
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  4. Snailexpress

    Snailexpress Road Train Member

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    You will be fine.
     
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  5. Xenergiserx

    Xenergiserx Light Load Member

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    Well they called marine batteries but they are just deepcycle with high CCA. Good for boats or RV. I figured they will run APU. But didn’t know all 8 batteries were connected.
     
  6. Sharky88

    Sharky88 Medium Load Member

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    8 batteries? Why 8? Just having an apu doesn't justify 8. On some big bunk sleepers like mine they might have house batteries that are charged by the generator or the truck but they are separated by an isolator.
     
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  7. Xenergiserx

    Xenergiserx Light Load Member

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    It’s an electric apu. Uses 4 extra batteries
     
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  8. skallagrime

    skallagrime Road Train Member

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    Place an isolator in between deep cycle and truck batteries, or at very least a low voltage cutout if it doesnt have it, deep cycle is prefered on hotel loads. Not doing any real harm unless deep cycles never get fully charged
     
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