Leisure Battery Size??

Discussion in 'Tech/Mech General' started by Doddy999, Aug 17, 2010.

  1. Doddy999

    Doddy999 Read Only Funster

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    Have finally got myself my 2 x 100amp batteries fitted into my new locker
    all ready to be connected.
    Now the original battery was a 85amp under the drivers seat which I have disconnected, but!!! the cable is only 4/5mm thick?
    Is this correct? or do I need heavier which means me having to run all new
    cable to the charger??
    Going away Monday so advice would be more than welcome. :Wink:

    Regards Doddy :Smile:
     
  2. aba

    aba

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    i would think that it should be fine bearing in mind that it would be rated for the appliance draw from the battery also there will probably be a tiny strand of a fuse on the end of it.
    i would use as thick as possible to connect the 2 batteries together and just slightly bigger than what is already there to link to the under seat location.
    remember to fuse both ends of the battery + links as if there is a problem with one end the other is still live:thumb::thumb:
    this is how i would do it there may be a professional along with a different view though.



    andy
     
  3. Johns_Cross_Motorhomes

    Johns_Cross_Motorhomes Trader - Motorhome & Accessory Sales

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    Abas got it about right

    Peter
     
  4. Doddy999

    Doddy999 Read Only Funster

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    Thank You Andy & Peter much appreciated :thumb:
     
  5. scotjimland

    scotjimland Funster Life Member

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    It's important to have the correct size cable not only to carry the load, but to minimise volt drop..
    The cable you have may be ample for the load but over a longer distance the volt drop will be greater, this will reduce the charging voltage.

    To calculate the cable size you need to consider both current and cable length ..

    An Example

    1. Max current in Amps = 25
    2. Cable length 5 mt
    3. system voltage 12v

    Cable size required as calculated from AEI cable site

    Cable size (sq.mm):25.00.
    Actual voltage drop over 5 mtrs. = 0.22


    Use the calculator or post your cable length and max current and I will do it for you
     
  6. acting_strange

    acting_strange

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    I do have to say that 4/5mm cable seems rather thin to me...Its like the cheap cable you get for jumping cars.....we used to call it "glow in the dark" because it used to get so hot when carrying a good amperidge
     
  7. Doddy999

    Doddy999 Read Only Funster

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    Well got it all up running:BigGrin: feels better when you do it yourself, done all new wiring & cable tied new cable along to central locker.
    Although all is running well, the batteries had stood for a while so when I started
    engine up my meter rose up to 13.9 vol.
    The original fuse used on battery was Green 30A, so have fitted 2 x inline 30A
    is this correct rating?? Seems high???

    Thanks again for all your help. :Smile:
     
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