Rob in Windsor,
I would start with checking your battery hook ups and make sure there connected correctly. If there are two batteries then make sure again the are connected correctly. If you are not sure of how the connections should be made take pictures of them and post them here for all to help.
It sounds like with the conv: breaker off in the fiver everything else is working on the 110 side of the house per your prior post and if you turn it on this is when the breaker in the house trips.
Look around in the battery compartment and look for any black/white burn marks in the wires running to and from your battery's. I would think if you had a short or connected the batterys incorrectly you would blow an inline fuse or the fuses at the converter but for some reason your tripping the breaker in the house
. Unless the converter itself has shorted and in that case will neeed to be removed and replaced. So start simple by checking battery connections and then start working your way back to the converter that is tucked behind a panel in the fiver mine is in the basement area and is only two feet from the main panel on the inside of the fiver, this should give you an idea where to look for it.
Again, good luck and hope you can find the problem and get it fixed!
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