Hawk wiring

[mannydiles]

Hi all,

I have a 2022 hawk that I had converted to lithium. It has a 25A National Luna dc dc charger in the system.

The shop I worked with installed what looks to be a 10awg wire running from the charger to the + terminal. Should I install a fuse at the battery for the wire coming from the charger? Should that wire be a 6awg as to meet national Luna recommendation too?

Also the kill switch, 10awg, wire headed to the fuse box is connected to the same aux terminal as the wire headed to the + post on the battery. Any issue with that?

I am probably over thinking this as it was a reputable shop and I have had no issues this far so the the setup.

 

[Jon R]

I don’t know anything about National Luna products, but I suspect that, for a 25 amp dc to dc charger located in a trailer or camper, they recommended 6 awg wires from the truck battery to the dc to dc charger. This recommendation would have been driven by trying to reduce the resistance and voltage drop of that long run of wire. The short wire run from the dc to dc charger to the battery would be just fine at 10 awg for 25 amps. In that shorter wire, voltage drop is less of a concern so the wire can be smaller, only limited by the ability to carry the required current without the wire overheating.

Most of us do-it-yourselfers would have continued the large wire all the way to the battery rather than change to a smaller size, but a shop has a selection of sizes and typically will use the smallest adequate wire to reduce cost. Again, if it’s what I described above, there is no concern with 10 awg wires running a few feet from the dc to dc charger to the camper battery for 25 amps.