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    1. · Registered
      2019 159 EXT HR (3500) in WA
      Joined
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      2,235 Posts
      If you are using a B2B, the current in the cables between the B2B and the house battery will be limited by design, so you can set your cable size based on the B2B rating, plus some fudge factor. Say 60a for the 40a B2B. (I would think that the B2B Manual would have something to say about the cable size - - if so, certainly follow that recommendation over random advice on the internet.)

      I used some 4ga welding wire from Windy Nation, they have reasonable prices and good quality.

      You will also want some kind of a crimper, either a hydraulic crimper or a hammer crimper.

      More random, free (and worth what you paid for it) advice: Don't buy the cheesey breakers from Amazon. Get some real Buss brand breakers from a reputable marine supply (West Marine, etc) or Del City.
       
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    2. · Registered
      2017 PM2500, 159"WB
      Joined
      ·
      316 Posts
      Discussion Starter · #7 ·
      If you are using a B2B, the current in the cables between the B2B and the house battery will be limited by design, so you can set your cable size based on the B2B rating, plus some fudge factor. Say 60a for the 40a B2B. (I would think that the B2B Manual would have something to say about the cable size - - if so, certainly follow that recommendation over random advice on the internet.)

      I used some 4ga welding wire from Windy Nation, they have reasonable prices and good quality.

      You will also want some kind of a crimper, either a hydraulic crimper or a hammer crimper.

      More random, free (and worth what you paid for it) advice: Don't buy the cheesey breakers from Amazon. Get some real Buss brand breakers from a reputable marine supply (West Marine, etc) or Del City.
      Thanks baxsie, the manual does have recommendations for wire gauge, it changes depending on length of the run but in general it says heavier gauge wire between the vehicle battery and the charging unit, for example, less than 10' of run says 6 gauge to the vehicle battery, and 8 gauge to the house battery.

      I plan on ordering my cables from batterycablesUSA, I've used them in the past and they have good prices and good quality. They also let you spec the length and what ends you want on them which is nice. Also means I need to know my wire runs before I order though...
       
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