Flexible Battery cable diameter for 2nd battery?

Discussion in 'Tech/Mech General' started by Camping Gaza, Sep 11, 2016.

  1. Camping Gaza

    Camping Gaza Funster

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    Been searching on here can't find....

    Adding a second 110ah battery... what diameter cable required? I know biggest is best, just trying to add capacity to existing 110ah not inverter etc. I dont know what the existing size is so anyone know an average?

    Cross section or amperage would be very helpful. ie 25mm sq or 170amps

    Anyone know?
     
  2. tonyidle

    tonyidle Funster

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    10 or 12sq mm will be fine if the batteries are within a metre of each other. Cable sizing for low voltage D C wiring is based more on volt drop at required current than on safe capacity.
     
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  3. Al1

    Al1 Read Only Funster

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    OD of 25mm2 cable is 10mm if that helps (170A), that's what I used to join two batteries.
    Al
     
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  4. scotjimland

    scotjimland Funster Life Member

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  5. Camping Gaza

    Camping Gaza Funster

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    Thank you Guys, that's great advice and help. - @Tony G7GOC, is that an Amateur Radio Callsign I see there? I wonder if there are many radio dudes on here?
     
  6. tonyidle

    tonyidle Funster

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    Must be a few. I'm not active but I put the call sign on to fish out the hidden ones. It hasn't worked very well☺. There's a thread somewhere about it.
     
  7. Camping Gaza

    Camping Gaza Funster

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    2E0VOX soon mobile!
     
  8. tonyidle

    tonyidle Funster

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    (y)
     
  9. Jaws

    Jaws Funster Life Member

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    When wiring in extra batteries you only really need use wire capable of handling the absolute maximum you are going to draw and charge at..

    If you do not use an inverter then something like AWG 8 or 10 would be right
     
  10. Techno

    Techno Funster Life Member

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    A very high proportion of readers still would have no concept of what that is size wise, at least with mm they have a clue :LOL:
     
  11. Techno

    Techno Funster Life Member

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