Yes you can run 3 airs on 50 amp service. Since 50 amp has 2 hot legs, you have 12000 watts available. One air will use approximately 1600 watts. 30 amp has 1 hot leg, thus only 3600 watts available.
Don
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2015 Ford F-350 Crewcab Dually
2016 Mobile Suites 36 RSSB3
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