![]() Note, Have you checked the cable wiring for the 30 amp cable you are trying to use to power the coach or the pigtail if you are using one.īy chance did the circuit breaker in the house trip or do you know there is power at the plug you are connecting to ? One selects from 10, 15, 20, 30 and 50 amps of shore power entering the coach.Ĭould you post the make and model of the charger / inverter installed in you coach and the model of the EMS system. The panel / switch where you select the shore current is part of the Charger / Inverter control panel. My book sez there is a panel as you mentioned where I can select tne 20 amp circuit? Cant find any. I guess my next question, is where is the control box showing the amperage output? I found the circuit breakers, fuses, and the main inverter etc where the shore power lines start. Here is a good source of information on proper wiring for RV's. Check also to be sure that the drop from the house is wired properly for an RV. If your coach works properly with a 50A supply but the 30A cord isn't working, take a test meter and check the 30A cord and the drop from the house. The EMS detected this and would limit our usage to 30A because the supply wasn't 220V. We have stayed in RV parks where the outlets were 50A but the supply was from a single wire (split at the outlet) and thus both sides of the 50A outlet were same phase. That is why the EMS looks for the 220V opposite phase electric and interprets the supply as 50A if opposite phase and 30A if same phase. ![]() If it sees opposite phase, 50A.ģ0A adapters supply electric to both 50A legs but both legs are receiving electric that is in phase, not opposite phase. Again, our EMS has no way to detect amps, only the voltage of the hot leads. If the supply is 20A then there is a button to push to select that supply limitation as a 20A looks exactly the same (both 110V) as a 30A to the EMS. 110V) indicates 30A service and it limits usage to keep it under 30A. If the two hot leads are the same phase (ie. ![]() The EMS looks for two hot leads which are opposite phase and this indicates 50A service. In our RV, the electric is never used as 220V, the two incoming leads are used as two separate 110V supplies. 50A electric supply for RV's has two 110 V hot leads which are opposing phase. 30A electric supply for RV's is 110V with one hot lead, a neutral and a ground wire. My EMS doesn't sense amps, it detects 220V or 110V. ![]()
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