12 Volt Car Adaptor Rating ? - Fiberglass RV
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Old 05-17-2017, 05:47 PM   #1
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Name: Dick
Trailer: '15 17' LD Casita and '17 Tahoe LT
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12 Volt Car Adaptor Rating ?

Two weeks ago, I bought a 24" LG 720 AC/DC from Target for $66. They are clearing out their white ones for half of the regular price of $129. Problem is that it doesn't seem to be 12 volt friendly. By that I mean the AC adapter has a DC connector on it that says 19 volts and draws 26 watts. I can't find a car adaptor that says 19 volts. I have found a couple that says 12-24 volts but I don't know if that means either 12 or 24 or anywhere in between the two. If you can advise me on this rating, I would appreciate it. I thought I was buying one that I could run off of the 12 volt plug in the Casita. I am afraid to plug in a car adaptor without the correct rating. As you can tell, I don't know anything about electricity except it will bite you...
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Old 05-17-2017, 08:17 PM   #2
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Smith Valley, Nevada
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A car voltage, and a converter voltage before it goes into "float" is 14- 14.4.

I suspect your TV will work fine on about 13 volts. If I let my batteries get down to about 12.3, mine begins to balk.

I suspect the 19 volts means the maximum, not that it requires exactly 19 volts. It's easy for me to say, but I'd try it and see how it goes. It won't bite you.
I only exaggerate enough to compensate for being taken with a grain of salt.
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Old 05-17-2017, 08:46 PM   #3
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If 110 volt AC adapter that came with your TV has a label that indicates the output is 19 volts DC, then you should be able to use a generic "19 volt car adapter". Some of these products come with various sized DC plugs, and hopefully one would fit your TV.

Don't try to use a straight 12 volt DC output from your camper.
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Old 05-18-2017, 07:32 AM   #4
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The internal circuits of the TV run on 19VDC. The AC adapter provides 19VDC. Either there should be mention in the owner's manual about capability to run on lower DC voltage, or there is a DC/DC adapter to provide 19VDC to the TV from a 12VDC source.

BTW I have been researching this myself and found some Sony and Samsung TV and BluRay players that run straight 12V or 14V. But as a pause, what would happen to your device if there was a surge from hooking up to shore power or battery charger? I'd rather have a DC/DC converter in between to take the blow, or at least keep an even regulated voltage to the devices.

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Old 05-18-2017, 09:15 AM   #5
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TV / Computer 12V DC Supply


You could use an adapter made for laptop computers to
be used in autos. The standard laptop AC supply puts
out 19V DC at about 3 to 4 amps. There are several
companies making these, but you might have to splice
on the proper connector to make it work properly with
your TV. I found one at a local thrift store for $2....
Output is 19V DC @ 3.7A or about 70 Watts.

If you use Ebay you could search for:

"car laptop adapter 19v output"

Larry H
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TV Adapter.jpg  
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Old 05-18-2017, 09:59 AM   #6
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Name: Dick
Trailer: '15 17' LD Casita and '17 Tahoe LT
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Silver Ghost- I have a old small 9" Sony that also runs on 12 volts. The 12 volt adaptor for it says 12-24 so I don't know if that means only 12 and 24 volts or anywhere between 12 and 24 volts. Am afraid to try it until I know. I plugged it into the cig plug in the car and the ohm meter read 12.3 volts.
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Old 05-18-2017, 10:06 AM   #7
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Name: Dick
Trailer: '15 17' LD Casita and '17 Tahoe LT
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Larry- The new tv's AC to DC adaptor says 19 volts and 1.3 amps. The manual also says 26 watts. The pic. you show indicates 3+ amps and 70 watts. Does having more than the required 1.3 amps (i.e. 3+ amps) to much to use? Will it adjust itself as long as you have at least 1.3 amps and not burn it up? Just afraid to plug in the one I use for the little Sony. (see above post). The new LG uses a male barrel connector but not sure of the size. Will have to measure it.
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