A/C off of 20 amp service?
Has anyone ever heard of a single a/c unit not being able to start and run on a 20amp shore power circuit? We bought a new coach and the dealer says don't run a/c unless connected to a 30 amp servic...
Forum Discussion
pianotuna wrote:
Hi,
I recently compared a #12 100 foot extension cord to a #10 100 foot extension cord on the same 15 amp shore power outlet. The same dog bone adapter was used with both--but obviously in two different places.
#12 voltage with a 311 watt load was 119.1
#10 voltage with the identical load was 121.
So monitor voltage carefully--and consider getting an autoformer.
Based on these tablesl, the difference in resistance between 12 gauge wire and 10 gauge wire is 0.589 ohms per 1000 feet. In your test, you have 200 feet of wire to account for (100 feet coming and 100 feet going), and a test current of about 3 amps, so the voltage difference attributable to the change in wire should be about 0.3 volts. Obviously something else is different--maybe the plugs made better or worse connections, or maybe the voltage at the outlet varied a little between the trials, or maybe the 12 gauge cord has a poor connection at one of its ends.
