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Old 09-15-2017, 08:18 PM   #21
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Brand: Still Looking
State: Texas
Posts: 6,187
THOR #2121
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Originally Posted by erice1098 View Post
So... I was talking with a past co-worker and fellow RV'er yesterday. He expressed concern with running a second unit (installed in the bedroom) solo off the shore pedestal, using the 110V/20amp plug, as it does not provide enough power and will cause damage the A/C unit to eventually burn it out...

Anyone heard this? Why would the A/C tech recommend this if this is the case?

This can happen if you run a standard large A/C that can pull close to 20 Amps under severe (hot) conditions, and it's plugged to pedestal with an extension cord that is either too long or too small in capacity. The extension cord will result in too much voltage drop, which means the A/C won't get the full 115-Volts. As voltage at A/C drops, it will require even more current to operate, which drops voltage even more, etc.

As long as your power cord is designed for the A/C's maximum rated current, you should be fine. This is another area where a higher efficiency A/C will help, like Power Saver models which requires less power/current.

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Old 09-15-2017, 11:25 PM   #22
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Brand: Thor Motor Coach
Model: 2017 Windsport 29M
State: Indiana
Posts: 3,692
THOR #5196
You want a heavy gauge cord and no longer than is absolutely necessary to reach a pedestal.
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