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DC doesn't like long runs of cable and 10 gauge isn't large enough to minimize loss. You're running DC voltage down that cable to the batteries - roughly 10 to 15 feet depending on how the factory pulled it. If you're only going to have 400 watts or so, 4 batteries, and aren't looking to have a 'perfect' system, you can use it as is. If you want to really optimize things, I'd figure out how to put in 6 gauge or even 4. This stuff is really stiff if solid core and large if stranded, so it might not go where the 10 gauge is now. Once again, Thor marketing and cost reduction people have influenced what they put in your unit.
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