We just got home from our first trip with the Progressive 30 amp portable EMS. The first day we had the AC running when it shut down. about a minute later it came back up. I didn't bother with going out to see what the code might have been - I was just happy that I had it and it did its job. Although it isn't rated as waterproof, it's pretty resistant to moisture, because we sat through some true gullywashers over the last week in Iowa, and the EMS stood up to the challenge. It may be the best purchase I've yet made for my TT.