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I need help determing gauge wire and fuse size

Discussion in 'Technical Chat' started by Donkeythekidd, Mar 2, 2021.

  1. Mar 2, 2021 at 5:24 PM
    #1
    Donkeythekidd

    Donkeythekidd [OP] Well-Known Member

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    I'm adding a 12v plug in the back of my truck and a couple usb charging ports. The 12v plug will be used to run a Dometic cfx3 95dz while driving (once I get to camp I'll switch to my battery generator). But let's just say I also want to charge 2 phones and have the fridge plugged in all at the same time. What gauge wire should I run to the battery and what size in line fuse should I use? I'm thinking the wire will be 26' long tops.
    Here are some of the specs for the fridge

    Screenshot_20210302-170649_Chrome.jpg

    And here are the ports I got for the truck along with the links for them. I switched out the 1 usb port for the QC 3.0 one
    Screenshot_20210302-170409_Amazon Shopping.jpg

    https://www.amazon.com/dp/B07JHH5YP4/ref=cm_sw_r_cp_apa_fabc_92DVBHNXYP8GSXD0XVPJ?_encoding=UTF8

    Screenshot_20210302-170352_Amazon Shopping.jpg

    https://www.amazon.com/dp/B0875K5643/ref=cm_sw_r_cp_apa_fabc_7283CXXZF1VEGDEDPQ7M?_encoding=UTF8

    Thanks!
     
  2. Mar 2, 2021 at 5:27 PM
    #2
    stevesnj

    stevesnj Well-Known Member

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  3. Mar 2, 2021 at 5:28 PM
    #3
    6 gearT444E

    6 gearT444E CEO & CFO @BPF

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    at 10 amps going to the back of the bed I'd use 10 AWG but you could probably get away with 12 AWG
     
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  4. Mar 2, 2021 at 5:34 PM
    #4
    Donkeythekidd

    Donkeythekidd [OP] Well-Known Member

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    So 10.4 for the fridge, I'm hoping that that's the most it draws while the compressor is running? What about 2 cell phones with qc 3.0? From what I can find it's about 2 amps each? Does that sound right? If that's the case I figure 15 amps total and going by that chart @6 gearT444E is correct 10 gauge wire. Thanks!

    What size fuse should I use?
     
    Last edited: Mar 2, 2021
  5. Mar 2, 2021 at 5:46 PM
    #5
    6 gearT444E

    6 gearT444E CEO & CFO @BPF

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    looks like 3 amps, so you will be under 15 amps total. 10 AWG will be good, add a 20 amp fuse early on in the circuit.
     
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  6. Mar 2, 2021 at 5:48 PM
    #6
    Donkeythekidd

    Donkeythekidd [OP] Well-Known Member

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    So add the fuse closer to the ports in the bed of the truck?
     
  7. Mar 2, 2021 at 5:50 PM
    #7
    6 gearT444E

    6 gearT444E CEO & CFO @BPF

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    Add right after you connect to the battery, you want the whole run of cable fused to protect in case of a short in the wire.
     
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  8. Mar 2, 2021 at 6:00 PM
    #8
    Donkeythekidd

    Donkeythekidd [OP] Well-Known Member

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    Thanks. I thought it should be closer to the battery since that's were all my others are.
     
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