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Thread: Traxide SC80 Battery Controller

  1. 18th December 2011, 02:51 PM #11
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    Quote Originally Posted by Graeme View Post
    IMO connecting the aux battery's earth to the body is better than using a cable connecting to the primary battery because there will be no voltage drop by connecting to the body but will be if using a cable. There's going to be voltage drop from the positive cable without adding to it with an earth cable. Don't connect to the D2's chassis though because it isn't positively earthed ex-factory, only via steering linkages etc although fitment of a winch with its earth connected directly to the battery usually overcomes this.

    A CB or fuse is required at each end of the inter-connecting power cable because if there's a short circuit part way along, neither battery must be able to provide unrestricted current so as to prevent a fire.
    Graeme,

    I used the earth point on the DS D pillar (under the brake light).

    So, is 7.9mm cable sufficient for the earth (it's only 350mm long) or do I need to go to 13.5mm cable here as well?

    Cheers,

    Franz
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  2. 18th December 2011, 02:54 PM #12
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    Quote Originally Posted by Pedro_The_Swift View Post
    just use the voltage drop calc to find your cable size over known distance


    Voltage Drop and Cable Size Calculator
    Thanks for that Pedro.

    How do I determine the maximum current demand? When my fridge fires up it will draw 5 amps plus for short periods. If I fire up the ARB compressor, it draws about 8 amps or more.

    Cheers,

    Franz
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  3. 18th December 2011, 03:35 PM #13
    Graeme
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    Quote Originally Posted by austastar View Post
    My you beaut tightly connected Earth return via the seat rail bolt wasn't so you beaut.
    That's because it wasn't a dedicated earth bolt - it was holding at least 2 pieces of metal together with an unknown/unreliable surface between them.
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  4. 18th December 2011, 03:38 PM #14
    Graeme
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    Quote Originally Posted by Franz View Post
    I used the earth point on the DS D pillar (under the brake light).

    So, is 7.9mm cable sufficient for the earth (it's only 350mm long) or do I need to go to 13.5mm cable here as well?
    Hi Franz,

    IMO that's a good earth point.

    I cannot advise on cable current carrying capacities.
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  5. 18th December 2011, 04:01 PM #15
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    Quote Originally Posted by Franz View Post

    Autobarn, SCA, Repco or caravan accessory suppliers.
    Ok - I will have to go visit them again - never seen real heavy stuff at any of the auto shops - was just at SCA and they do not have anything heavy like I have on my van.

    Cheers

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  6. 18th December 2011, 04:42 PM #16
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    Quote Originally Posted by garrycol View Post
    Ok - I will have to go visit them again - never seen real heavy stuff at any of the auto shops - was just at SCA and they do not have anything heavy like I have on my van.

    Cheers

    Garry
    Also try Battery World.
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  7. 18th December 2011, 06:20 PM #17
    TonyC
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  8. 19th December 2011, 07:15 AM #18
    scott oz Guest

    Exclamation

    Don't know how true it is but I was always told that earthing to the body etc promoted corrosion. It was always better to earth back to the battery.

    Is this an urban myth
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  9. 19th December 2011, 07:21 AM #19
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    a tip for your main cable circuit breakers and fuses

    connect a small light (or bi directional led with a suitable resistor) across each one, when one lets go it will provide an indication that the thing is doing its job and has gone open circuit.
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  10. 22nd December 2011, 01:58 PM #20
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    Quote Originally Posted by Franz View Post
    Thanks for that Pedro.

    How do I determine the maximum current demand? When my fridge fires up it will draw 5 amps plus for short periods. If I fire up the ARB compressor, it draws about 8 amps or more.

    Cheers,

    Franz
    Depending on the model of compressor it will draw more than that, once up around 30 psi 20+ amps is normal

    Rule number one with cabling is if in doubt go larger, larger wont hurt, smaller will.

    If you are running a charging style cable to a camper or similar there are better ways of doing it such as the REDARC BCDC charger. Check out REDARCS website for lots of useful info on wiring to.
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