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04-29-2019, 12:29 PM
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#1
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Junior Member
Join Date: Sep 2012
Posts: 27
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Operate A/C on 20 amp shore power
I recall reading a post that you can't operate your A/C on a 30A to 20A house connection? Cannot find the thread for the life of me! Planning a summer trip with new RV & will want to stay with many family members rather than RV park.
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04-29-2019, 12:36 PM
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#2
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Senior Member
Holiday Rambler Owners Club
Join Date: Aug 2010
Posts: 9,723
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You should be able to run a single 13,500 BTU A/C on 20A, but I would switch the refridgerator to propane, and limit the amps to the charger, if you have the capability. Make sure your plug prongs are clean and shiny.
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Ben & Sharon
2008 43' Holiday Rambler Scepter PDQ
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04-29-2019, 12:42 PM
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#3
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Senior Member
Join Date: Jul 2018
Posts: 3,165
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No problem with A/C on 20 amp shore power. Put WH and fridge on gas on gas
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2011 Keystone Sprinter 323 BHS. Port Charlotte Fl/Hinsdale MA. Retired Master Electrician. All Motor homes are RV's. All RV's are not Motor homes.
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04-29-2019, 02:47 PM
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#4
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Senior Member
Join Date: Jul 2014
Posts: 35,317
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I've run on 20 amp service at family homes many times.
AC, fridge, converter and TV. In hotter weather, when the AC works harder, I would switch the fridge to gas.
Get a 25 ft 12 gauge extension cord, if needed, and use the dog bone adaptor.
The cheap, short adaptors, with no cord between the plugs, get hot because the connections are so close.
As time passed, I have installed 120 volt 30 amp RV outlets in some of the family members houses.
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04-29-2019, 03:09 PM
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#5
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Senior Member
Join Date: Jul 2010
Posts: 5,309
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Concur with above... All gas/electric powered items to gas. No hair dryers or other items that tend to draw lots of power, unless you turn AC OFF. Want to run microwave ? Turn AC off. You might consider if you are going to be visiting often, offer to pay to get a 30 amp circuit installed at their home.
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Tom
2016 Newmar Bay Star Sport 3004
2021 Jeep Gladiator Sport Willys
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04-29-2019, 05:41 PM
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#6
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Senior Member
Join Date: Nov 2015
Posts: 26,643
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YES....MAYBE....NO
Depends on which A/C Unit and amp draw
13.5K A/C ---2750W startup (23A)-----1250W avg once running (10.4A)
15K A/C -----3500W (29A) -------------1500W avg once running (12.5A)
Doable.....but limited
Startup currents could be an issue.
This is assuming the 20A outlet does NOT have anything else on same circuit
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I took my Medication today. HAVE YOU?
Dodge 3500 w/Tractor Motor
US NAVY---USS Decatur DDG-31
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04-29-2019, 06:04 PM
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#7
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Senior Member
Join Date: Jul 2018
Posts: 2,812
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Foretravel tag axle 40 ft. 500 hp/1550 ft/lbs ism 1455 watts on the roof. 600 a/h's lithium down below.
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04-29-2019, 06:23 PM
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#8
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Senior Member
Join Date: Apr 2017
Location: Vista, Ca
Posts: 497
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It will matter more not on the AC you have but its condition. The 3 year old Dometic we had would not run reliably on our house 20A but the AtWood which is a much better design will with no problems. We bought all the hard start/soft start gizmos but nothing made the Dometic reliable which we can not have having dogs inside the trailer for long periods of time in the desert.
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1992 Dodge D250, 18cm housing, getrag 5sp, 4" straight pipe
2015 Pacific Coachworks Sand sport 18SLE
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04-29-2019, 06:57 PM
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#9
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Senior Member
Commercial Member
Join Date: Aug 2012
Posts: 726
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Quote:
Originally Posted by Old-Biscuit
YES....MAYBE....NO
Depends on which A/C Unit and amp draw
13.5K A/C ---2750W startup (23A)-----1250W avg once running (10.4A)
15K A/C -----3500W (29A) -------------1500W avg once running (12.5A)
Doable.....but limited
Startup currents could be an issue.
This is assuming the 20A outlet does NOT have anything else on same circuit
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If you look at the breaker panel in most all RVs, a 13.5k is wired on a 15amp breaker and a 15k is on a 20amp breaker.
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04-30-2019, 09:00 AM
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#10
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Junior Member
Join Date: Sep 2012
Posts: 27
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running A/C on 20 amp service
Thanks to all who responded. Your information helps.
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