I replaced the converter on our 5th wheel after experiencing similar issues last year. I didn't hook-up the battery backwards so I can't speak to that problem but the lights would go dim after a little while. I replaced the converter and all is good as new now. Do your research on the converter, don't always go with the cheapest unit, there are many options available.
The microwave, outlets, and AC operate on a completely separate circuit, they are 120V AC power and not 12V DC power so the outlets and microwave should function normal as long as you are plugged into a 120V power source even if the converter is going bad. All other devices in the trailer are DC power and will be affected by the converter / battery.
I would suggest marking the battery cables with a tag or other method to prevent future hook-up issues.
Good luck.
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Tom and Lori
1996 F250, 7.3L, TS chip, 4" exhaust, EBP delete
2012 Cruiser 335SS
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