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The 50 amp plug provides two- 50 amp circuits, using a 30 amp adapter you connect to one side of the plug, insuring you will have a full 30 amps available. Again your RV is not going to draw more than 30 amps without your circuit breaker opening. Using a 30 amp circuit, the most you will have is 30 amps, less losses from old or poor connections, line loss etc.
My unit shows voltage and amp demand on the surge protector display. Most connections show the same input voltage, but I have seen as much as 5 volts higher input from 50 amp adapter compared to 30 amp connection on same box.
FWIW When the voltage is higher, the display also shows the amp draw for the same load is lower
When available I use the 50 amp adapter with 30 amp power cord..
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U.S. Coast Guard retired- 1956-1985
Pensacola, Florida
2016 Siesta 24ST
1972 Moto Guzzi Eldorado
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