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Old 06-16-2015, 02:59 PM   #1
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Loss of coach power

We were plugged into 50 AMP service. Had to keep the inverter on to run the TV. Surge monitor read 117V 24A over 123V 0A. What does that mean? Dropped to 118V 13A over 121V 10A and back half of the coach lights got dim. Any suggestions?

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Old 06-16-2015, 06:45 PM   #2
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50 amp RV service is composed of two 'legs' of 50 amp power, for a total of 100 amps in reality. 30 amp service is one leg of 30 amp power. That's why 50 amp service provides almost 3 times the power of 30 amps!

On your display, "117V 24A over 123V 0A" It was showing one leg was at 117 volts, 24 amps, the other leg was 123 volts 0 amps. Probably you had the air conditioner and the inverter/charger on the first leg, no load on the second leg. If you had turned on the other air conditioner, the load would show on the second leg reading. The second reading was "118V 13A over 121V 10A" which indicates some load was dropped on the first leg while the second leg had picked up 10 amps of draw.

All those numbers are within specs of the pedestal power, The lights that dimmed, were they 12 volt or 120 volt lights? Most interior lights are 12 volt systems. If some went dim, check the connections on your house batteries and ground, they may need cleaning.

The two legs of 50 amp power to your RV is divided up by the way the circuit breaker panel is wired. They try to distribute the possible power needs to both legs so neither is overloaded. Owners can mess with this if they plug in a couple of space heaters or hair dryers all on the same 50 amp leg. It doesn't switch over from one to the other.


Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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Old 06-18-2015, 09:16 AM   #3
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Those outlets are powered through the inverter, even when on shore power. Your inverter probably has a built-in switch to that uses shore power when available but changes to inverter/battery when needed. If the circuit breaker that feeds 120v to the inverter is tripped, you get no power and no battery charging.
Gary Brinck
Former owner of 2004 American Tradition
Home is in the Ocala Nat'l Forest near Ocala, FL
Summers in Black Mountain, NC
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