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What gauge wire do I need for fridge circuit?

Discussion in '3rd Gen. Tacomas (2016+)' started by Rujack, Dec 14, 2018.

  1. Dec 14, 2018 at 11:05 PM
    #1
    Rujack

    Rujack [OP] Stop Global Whining

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    I’ve got my fridge mounted in the bed near the tail gate.

    I don’t recall how many amps it draws, I’ll have to check in the a.m., but can someone tell me what gauge wire I need, and what size fuse? I am currently only using the stock battery but will be adding a second in a couple of months. To help keep the battery charged I’ve got a 100w solar panel on the roof.

    Also wondering if I need to run the neg all the way back to the battery (can I just run negative to chassis somewhere closer to the fridge?).
     
    Last edited: Dec 14, 2018
  2. Dec 14, 2018 at 11:21 PM
    #2
    OnHartung'sRoad

    OnHartung'sRoad -So glad I didn't take the other...

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    You really need to know the amps to know how to wire this because if you use too small of a gauge, the refrigerator won’t work well or worse :bananadead:

    Running the negative to a ground (with at least the same gauge wire as the positive conductor) on the battery is preferable to using the frame when dealing with higher amp circuits.

    Use this chart to help figure your wire gauge based on length needed and load (amps): https://www.google.com/amp/s/www.engineeringtoolbox.com/amp/amps-wire-gauge-d_730.html

    Also, note that your 100w solar panel will work to top off the battery, but also check to see it it will keep up with daily use of the fridge:

    amp = watt / volt
    amps = 100W / 12V = 8.3333A

    And, since you are only using one battery, get a jumper pack just in case you chill your beer for too long! I made that mistake, but it was a good one- I was camping on a beach in Baja California with a girlfriend and we had the place to ourselves with plenty of supplies, so a dead battery was fine for a couple days. :)
     
    Last edited: Dec 14, 2018
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  3. Dec 14, 2018 at 11:24 PM
    #3
    Rujack

    Rujack [OP] Stop Global Whining

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    Ok, that’s what I figured, on all accounts.

    I’ll have to check the amperage in the morning.
     
  4. Dec 14, 2018 at 11:27 PM
    #4
    Simpleton

    Simpleton Well-Known Member

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    need to know the specs of your fridge. should have amps listed on it. and there are numerous charts online to help you determine wire gauge. depends on you length of run from AND back to the battery. As said above I wouldn't use the frame as the ground for high current uses.
     
  5. Dec 14, 2018 at 11:42 PM
    #5
    JoeCOVA

    JoeCOVA IG @MightyJoeFlannel

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    It’s not just amps but also length of wire as well, single wire, bundled etc
     
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  6. Dec 14, 2018 at 11:59 PM
    #6
    bagleboy

    bagleboy Well-Known Member

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    Fridge current < fuse rating < wire rating. The fuse protects the wire not the fridge.
     
  7. Dec 15, 2018 at 2:26 AM
    #7
    jcos112

    jcos112 Well-Known Member

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  8. Dec 15, 2018 at 8:32 AM
    #8
    Rujack

    Rujack [OP] Stop Global Whining

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    13a, maybe a 25’ run from batt to fridge

    34B5AEE2-7E74-477D-9AC2-F1778606F779.jpg
     
  9. Dec 15, 2018 at 8:34 AM
    #9
    OnHartung'sRoad

    OnHartung'sRoad -So glad I didn't take the other...

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    One more suggestion- use larger guage cables than you think you will need for future mods back there. Then iin your camper, use a ground plate and a fuse block to terminate your power cables in the camper so you have a way to attach other goodies. Many out there, like these, but there are some smaller ones available, too:

    https://www.amazon.com/dp/B001P6FTHC/ref=cm_sw_r_cp_api_i_i1sfCbND4S79Z

    https://www.amazon.com/Blue-Sea-Sys...ocphy=9031498&hvtargid=pla-436661250661&psc=1

    I also put a fuse block between the possitive terminal of the battery and the positive cable- there are several types, including circuit breakers with power switches too. They make it a lot safer in case your long power cable shorts.
     
    Last edited: Dec 15, 2018
  10. Dec 15, 2018 at 8:40 AM
    #10
    Hobbs

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    If you have the owner's manual for the fridge you can find that info in there. Or prolly on the fridge manufacturer's website.
     
  11. Dec 15, 2018 at 8:45 AM
    #11
    medic2230

    medic2230 @Koditten Pirate Radio member #002

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    I ran 10ga from the battery to under the drivers seat on mine. Works fine.
     
  12. Dec 15, 2018 at 8:52 AM
    #12
    windsor

    windsor Just a guy

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    For the dometic 3 way fridge, Id run 10 or 8 with a dedicated ground wire.
     
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  13. Dec 15, 2018 at 8:56 AM
    #13
    Rujack

    Rujack [OP] Stop Global Whining

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    If I use too thick a gauge doesn’t it increase resistance? Anyway I’m just trying to get this hooked up last minute to get it off of propane...
     
  14. Dec 15, 2018 at 8:57 AM
    #14
    FFBlack

    FFBlack Well-Known Member

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    Do you have the solar charger hardwired to the roof and battery or is it a temp type thing you set up when you arrive.
     
  15. Dec 15, 2018 at 8:58 AM
    #15
    Rujack

    Rujack [OP] Stop Global Whining

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    Cool. So if I want to allow for future accessories and a fuse block as @OnHartung'sRoad suggests, should I use 6, or smaller?
     
  16. Dec 15, 2018 at 9:04 AM
    #16
    windsor

    windsor Just a guy

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    Personally, I would not put the fridge on a fuse/fuse block. I would (and did in the Airstream) run it with a Bussman breaker of appropriate size.
    20180614_085755.jpg
     
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  17. Dec 15, 2018 at 9:08 AM
    #17
    Rujack

    Rujack [OP] Stop Global Whining

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    Permanent

    image.jpg
     
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  18. Dec 15, 2018 at 9:10 AM
    #18
    Rujack

    Rujack [OP] Stop Global Whining

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    I considered this and may go that route, but the breaker ant be sourced today
     
  19. Dec 15, 2018 at 9:15 AM
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    bajatacoguy

    bajatacoguy Well-Known Member

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  20. Dec 15, 2018 at 9:37 AM
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    Rujack

    Rujack [OP] Stop Global Whining

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    I’m a fan myself!
     
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