![]() ![]() Verify that number doesn’t exceed the max amps of the wire listed here: Wire Size Since we’ve seen that alternator charging rarely goes over 100 amps, fuse size is less of a concern as it’s mainly just in place for catastrophic failures (if insulation breaks down and shorts to ground)įor fuse size, I recommend taking your rated alternator output and multiplying by 1.5 to get your fuse size. If you go this route, keep in mind your voltage drop. If you are bound and determined to use the smallest wire possible for this application, this chart tells you the max amps a given wire with 105☌ insulation can safely handle: Wire Size This does back-up even further, though, my claim that 2/0 is a great choice of wire size for installing a battery isolator. This sample size is small enough, though, and stats are questionable enough to need to disclaimer that this info should only be used as an “FYI” rather than actual good information. What conclusions can we draw from this info? Not much, honestly… The biggest takeaway that I can gather from this information is that house battery banks charged by the alternator rarely charge at rates greater than 100 amps. There were also some respondants who didn’t know how many amps they were charging their house batteries with, BUT they did know the fuse size that was on that wire from the alternator to the house battery, which we can then assume that their amps never go above the size of that fuse. This list is of what people reported their wire size was, alternator size was, and the most amps they have seen going to their battery: Alternator Size
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