Reverse Polarity Fuses Circuit Question

DrewE wrote:
Parallel means side-to-side, with the end leads connected together. So you'd have the wire from the converter, connected to one end of both 30A fuses, and the other ends of the fuses also connected together to one wire going to everything else. The goal is to have half the current flowing through each fuse, basically forming a 60A fuse. If the legs are somewhat unequal for whatever reason, the current won't be evenly split, and one of the fuses would be likely to blow even under non-overload conditions or when a reverse polarity battery connection is made, followed momentarily thereafter by the other one (which would then be carrying the full current). A single 60A fuse would be simpler and better.

Series connection means end to end, the same current passing through everything. Having multiple fuses in series is pointless. Having the fuse(s) in series with the output of the converter, however, is necessary—that's just saying that the wire from the inverter goes to the fuse(s), and then the wire from the other end of the fuse(s) goes to the rest of the world.

I see now why some people have reported that only one of the two fuses has blown. The usual advice being to replace both fuses anyway, since the one that didn't blow might be "stressed"

Also this all shows how come sometimes people report their battery fuse or DC circuit breake at the battery has failed, and also the RP fuses way up at the converter have also blown.

My Xantrex inverters do not seem to have any RP protection, and will be immediately fried if you screw that up. No second chances! OTOH the portable battery chargers, converters, and solar controllers do seem to have internal RP protection depending on the model etc. Got to read the info on them to know for sure in each case.

So every RV pretty much has a fuse at each end of the battery to converter positive wire: the battery fuse and the RP fuses in the converter.