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Old 05-17-2022, 02:05 PM   #1
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Are my rooftop Air Conditioners AC or DC?

Are my rooftop Air Conditioners AC or DC?
Thanks in advance.
- Are they running off shore power and/or my generator or are they getting their juice from the house batteries?
How can I figure this out?
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Old 05-17-2022, 02:09 PM   #2
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AC. They will run off of shore power and the generator.
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Old 05-17-2022, 02:39 PM   #3
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Actually the answer is yes. Both AC and DC. The DC activates the control circuits, and the AC runs the fan and compressor.
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Old 05-17-2022, 04:28 PM   #4
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Yep, the compressor and fan motor(s) run from the shoer poser or generator on 120 VAC (volts alternating current). But on most of the A/C units, the control circuit is 12 VDC (volts direct current) or battery. The RV has a converter that converts 120 VAC to 12 VDC and charges the battery(ies).

If you have an INVERTER, it will convert 12 VDC to 120 VAC, usually to run a residential fridge or the TV and electronics.

A few years ago I saw a book from the Dummies series called RVs for Dummies. It was a pretty basic, but was a good starting point.

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Old 05-18-2022, 10:17 AM   #5
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Originally Posted by HarryStone View Post
Actually the answer is yes. Both AC and DC. The DC activates the control circuits, and the AC runs the fan and compressor.

Only on models that are controlled by wall-thermostats, which are 12v devices. If you have roof a/c units without an external thermostat, i.e. all the controls are on the a/c itself, there won't be any 12v power to the a/c at all.
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Old 05-20-2022, 02:50 AM   #6
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Thank you!

Sorry for the delayed response been tied up on other things. All makes sense and much appreciated. Thanks so much everyone!
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air, air conditioner, roof

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