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Old 06-16-2018, 03:46 PM   #1
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Not enough cooling

We have a 30 amp system which is not enough for both our roof A/C units to work without tripping breaker. Can a roof mounted A/C be wired directly to and external extension cord?
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Old 06-16-2018, 03:55 PM   #2
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I wonder what size your air conditioner are? When running both of my 13500 btu roof air conditioners they draw 22 amps. Are you sure nothing else is running like water heater, or engine block heater?

I imagine you could rewire one of them to run on a extension cord, especially if your roof air conditioners are on separate circuits.
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Old 06-16-2018, 03:55 PM   #3
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Yes, there have been a few posts here where folks did that.
I think some ran new wires to the air conditioner.
And some tapped in to the wires at the generator that ran to the rear air unit. I THINK these folks all had a 5.5kw generator that could run both ACs at the same time.
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Old 06-16-2018, 04:23 PM   #4
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We, with the support of a fellow IRV member, wired a separate line from the front a/c unit to a double pole DC controlled switch, which enabled the circuit to be transferred to an outside power line to the 20 amp recept at the power posts in most campgrounds. The use of the double pole enabled the power and ground to be transferred which helped manage the ground fault recepts.
Works great when we really need lots of A/C. (Draw a schematic of the current system and then insert the double pole switch in the circuit to move the power from the current circuit breaker to the separate outside line). The rear A/C is still managed by the Inteliteck energy system. Both now work not connected.
50 Amps for a 30 Amp system.
One issue is that lots of RV campgrounds have removed their 20 Amp recepts. We then use a 50 Amp to 30 Amp dog bone for the main power and a 30 Amp to 20 Amp dog bone for the front A/C unit.
PS: both of our A/C units are 16,000 BTU Brisk Air II units.
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