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Old 02-04-2018, 01:55 PM   #1
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50 amp 2AC unit without power monitor?

So I think we bought a HR that is 50 amp with 2 ACs. I noticed that it does not have the energy management system display that I see in many similar units. Itís a new unit with OEM installed ACs. Do you have to have a EMS? Oh yeah has a 5.5 Onan
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Old 02-04-2018, 01:59 PM   #2
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Dont see a need for one. 50A is more than enough to run two AC units, plus refer and water heater on electric.
Don and Lorri
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Old 02-04-2018, 02:07 PM   #3
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I run 3 at the same time, as well as all the things mentioned by 450Donn.

You'll be fine on a 50A service !
Ben & Sharon
2008 43' Holiday Rambler Scepter PDQ
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Old 02-04-2018, 02:11 PM   #4
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The only time you may have a power issue is if you adapt down to 30 amp service. Then 2 ACs and a water heater could trip the power post breaker.

On 30 amp RV service, your working with 120 volt, 30 amps of power.

On 50 amp service, your dealing with 240 volt 50 amp service, that gets split at your panel. Now yiu have two 50 amp 120 volt services. 100 amp will run lots of stuff.
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Old 02-04-2018, 02:12 PM   #5
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"EMS" has two different meanings in an. One EMS is the Intelletec 30A power management system and another is the Progressive Industries power line quality monitor. Unfortunate that the same name is used for two different electrical products, but nobody asked us RVers.

If you mean the display panel that shows Service Type (30A, 50A etc) and appliance power status (AC on. Heater ON, etc), That is the Inetlletec EMS and its handy but not necessary. It's value is to help manage amp load when your 50A coach is plugged to a more limited 30A outlet. It's main purpose is to save you from popping circuit breakers on the shore power post. It looks like the one in this manual:

If You mean the Progressive Industries shore power monitor, it's a safety device that protects your coach from poor quality or incorrectly wired shore power sources. It's excellent insurance against damage to electrical components. You may never encounter a shore power problem, but if you do, this kind of EMS will save you aggravation and money. A similar product is called the Surge Guard, avoiding the name conflict. It's easy enough to add one of these if you want one, either a portable unit or a permanent mount model.
Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is in the Ocala Nat'l Forest near Ocala, FL
Summers in Black Mountain, NC
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Old 02-04-2018, 02:13 PM   #6
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50 amps will run your coach, 50a 2 pole is 50a per leg. 5.5K onan is 45.8a devided by 2 = 22.9a each leg. should run airs ok but not much more.
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Old 02-04-2018, 02:35 PM   #7
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Most 5500 watt generators are wired 120 volts with a 30 amp double breaker or a 30 and 20 amp breaker.

They would tie both outputs together at the auto transfer switch and share the 50 amps down both legs. It would be like 30 amp 120 volt service but with 20 more amps to use.
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Old 02-04-2018, 02:39 PM   #8
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Ok well ill sure have booth acs blasting with gen on during the PDI
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