110 volt 400w outlet

Stephen Swap · Jun 26, 2018

I own a 2017 F250 equipped with the auxiliary 110 v 400w in cab power outlet When my wife plugs her heating pad into this outlet (pad draws 150watts max) it works but the pads hand control gets very hot and the view screen on it goes black. It works fine on normal house power. Is this issue related to the sine wave differences on inverter generated power or something else?

01yellerCobra · Jun 26, 2018

What's the current limit on the plug in the truck and how much current does the pad need?

Stephen Swap · Jun 26, 2018

As stated truck outlet is 400watts @ 110 volts AC and pad draws 150watts max when set on high.

01yellerCobra · Jun 26, 2018

That's wattage. Current is in amperage. My guess is the current rating for the plug in the truck isn't quite enough.

Stephen Swap · Jun 27, 2018

Using Ohm's law the truck supplies 3.63 amps. 400w/110v =3.6363A
The pad on maximum setting is 150w/120V=1.25A. The supplied power is not the issue. I believe that I've gotten the answer. Some of my RV friends have inverters in their motor homes and they have noticed that none of their AC appliance's run the same when on inverted power but work fine on shore supplied power. It's the artificially created square sine wave that an inverter produces versus the nice pure wave that our power companies provide. I was told that the inverted wave is simulated by switching the power from plus to minus thus creating the square wave pattern. Sounds like a good answer to me. Thank you for your input

110 volt 400w outlet

Stephen Swap

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01yellerCobra

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Stephen Swap

SDD Junior Member

01yellerCobra

Full Access Member

Stephen Swap

SDD Junior Member

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