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Frig on the "electric" setting while towing


TxCowboy

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Unless you have what is called a "3 way" refrigerator, or possibly an inverter to supply the power, your refrigerator will not cool while driving because the standard RV refrigerators require 12V for control circuits and either propane or 120V-ac for the heat source. Of course, if your RV has a household type refrigerator, and an inverter to change 12V-dc to 120V-ac power to supply it, then it may work. Since it wouldn't be running all of the time, the 12V charging lead in your 7 pin connector probably will keep up with the demand for power.

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The fridge probably needs about 500 watts, 40 amps to run on AC which is a lot to expect from the trailer plug's wiring. It is intermittent as Kirk mentioned so you would likely keep up if you put an inverter in the RV.

 

Running an inverter in the truck and using two extension cords (so they can unplug if pulled on) is a much better idea and it gives you AC power in the truck for other uses.

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I would caution you about inverting AC in the truck and sending it over to the trailer. You need to do that correctly - taking appropriate safety measures - or you can cause a real issue if things go wrong. You need to know what you are doing and use appropriate plugs/receptacles if you tackle sending 120v across. Bill does know what he is doing, so his installation is safe. But this is not something I'd recommend for people not familiar with safety issues with 120v power.

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Thanx Jack - I should have included that. Special waterproof plugs and receptacles, fuse / circuit protection. I also run the trailer charger so there is an automatic 12V disconnect from the 12 V charge line of the truck plug --- circulating currents, 12v on the truck, invert to 120, to the trailer, charge the batteries at 14V, (disconnecting relay inserted here), 14 volts back to the truck through the Bargman plug, charging the truck battery. invert to 120VAC and the circle continues..

 

You also have to be VERY cognizant of the alternator capabilities of the truck. Most are rated for the SLI batteries in the truck and will not sustain a continuous heavy load.

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