Originally Posted by HawkinGal
The little (20 sites) campground at my Michigan sporting club only has 20 amp service.
Just got off the phone with the seller of an '85 Sovereign
29' who says his original Coleman ac doesn't make the trailer cold on 20 amp, ice-cold on 30 amp.
What the seller told you does not reflect Ohms Law. I would be very skeptical.
Appliances like a rooftop AC draw a fixed amount of current in amps. If the campground outlet supplies that amount of amps (or more) it will work fine. If the campground outlet supplies less amps than the A/C needs, the campsite breaker flips off.
It can easily be calculated. Just find the wattage specs for your model A/C.
A Mach 3 13500btu A/C for example specifies wattage as 1595/1924. Watts divided by voltage gives current. So....
1594watts/120volts = 13amps on low
1924watts/120volts = 16amps on high
The 20amp service at your campground would run the Mach 3 and leave a few amps for other things.
If that Mach3 tripped a 20amp breaker at 120v, something is wrong with it.