12v wiring advice

Discussion in 'Motorhome Chat' started by PJGWiltshire, May 19, 2017.

  1. PJGWiltshire

    PJGWiltshire Funster

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    I am looking to install a double USB charging socket. The most convenient position is immediately next to the TV station, which in my van is a pop up type from behind a fixed seat. The TV is wired directly into the 12v wiring system and fused as part of the 'Media ' circuit in the main fuse box. The fuse on the Media circuit is 20A.
    Having read up on the USB socket ( a double which supplies a 1A and 2.1A outlet) mention has been made that it should be installed with a 10a fuse.

    This is where I get confused. My thoughts are simply to splice into the TVs + and - wires and then let the 20A fuse protect the USB charger as it will now be on the media 12v circuit. Will there be issues around the fuse size? My intention is for the USB charger to charge iPhone on the 1A side and the iPad on the 2.1A side.

    Hope someone can help
     
  2. scotjimland

    scotjimland Funster Life Member

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    Fuses are fitted to protect the cable from overload.. so the 20A fuse is fine.

    When you splice in, fit an in-line 5amp fuse to protect the new circuit.
     
    Last edited: May 19, 2017
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  3. PJGWiltshire

    PJGWiltshire Funster

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    Many thanks,
     
  4. pappajohn

    pappajohn Funster Life Member

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    Wot Jim said....but 10a sounds a bit high for a USB socket drawing a max of 3.1 amps.
    I think i would start with a 5amp, if that blows then a 7.5amp, if that blows theres something wrong.
     
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  5. PJGWiltshire

    PJGWiltshire Funster

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    Will do thanks
     
  6. Sheddy

    Sheddy Funster

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    I have had two twin USB outlets both running with an inline 5 amp fuse with no problems for a year or so, I also fitted a switch to each which stops them being powered and the led on when not in use.
    Cheers
    Ed
     
  7. PJGWiltshire

    PJGWiltshire Funster

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    Good idea thanks
     
  8. PeteH

    PeteH Funster

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    Mine has a nice blue LED, which is real handy for navigating to the "loo" at 2am!:D
     
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  9. Gellyneck

    Gellyneck Funster Life Member

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    Why have you got USB sockets fitted in your loo?:whistle:;):)
     
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