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et2, the converter going bad is NOT supposed to be the norm, if that were the case, full-timers would be having fits because they live in their rigs and the converter should last and last. Maybe you had a surge or something that cause the converter to fail. That's what would cause your batteries to die, because your fridge was still running and draining the batteries after the converter went bye-bye.
We should add that you should be using a voltage regulator, surge suppressor or a voltage conditioner (prevents brownouts) will probably be needed as well to cause your converter to fail prematurely.
Trailer Trash has another good idea for keeping the batteries charged but you must still check the water of the batteries some how. Make sure you get a very high quality recharger that does not toast the batteries after they are charged. Like I mentioned I use a charger/conditioner so that my batteries don't fry, but the water must still be checked.
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