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Old 11-28-2014, 07:41 PM   #21
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Trailer: Scamp 13 ft
Posts: 16
My Toshiba Satellite uses a 19V wall wart, but I found online a 12V to 19V car adapter. Works fine. The less you need to convert from DC to AC then back to DC, the better. Reduces the inherent losses all the way around.
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Old 11-29-2014, 04:18 PM   #22
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Name: Francois
Trailer: Bigfoot
British Columbia
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reinventing the wheel ???

my HP laptops "brick" has a stated output of 19.3 volts...and my meter confirmed that is what it is putting out....

I took the battery out of the laptop and it is a.... 10.8 volt !!!

this tells me that I could get an appropriate size plug for the laptop, wire it directly into my 12V electrical system and it would run the laptop all day/week long like that with no problems (I don't have/use a converter in my trailer...ie no "unfiltered" 12V issues)

I'm assuming the 19.3V is to "top up" the laptops battery (10.9V) as required just like a car charger will put out 14.4V to charge the 12V battery in your car

seems kinda strange to take 12V, turn into 120 then turn it into 19.3 for a product that will work just fine on roughly 10 (????)

Am I crazy or what ?
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Old 11-29-2014, 04:34 PM   #23
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Name: David
Trailer: 1998 Casita 17 SD
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If your laptop is a Dell or HP then you will need an inverter or a 12v to 19v charger from the manufacturer. The center pin on the plug is a "sense" pin which tells the computer that is is a Dell or HP and the watt rating. Without this signal it may run but will not charger and may throttle the cpu to a lower speed.
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Old 11-29-2014, 05:17 PM   #24
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Name: Francois
Trailer: Bigfoot
British Columbia
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don't that beat all....

so that plug has one negative and TWO positives !!!

I get 19.3 from the "inner ring" positive and 18.3 at the pin (charger/brick output).....

more complicated than I thought.... or could see

for now I'll just keep running/charging it through a small 150W inverter I got.....thanks
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Old 11-29-2014, 05:34 PM   #25
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Trailer: Class A Motorhome
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As Floyd mentioned, RF interference with MSW inverters can be a problem. While it usually isn't a problem for straight charging, if you are running at the same time sometime weird things can happen.
On my 400 MSW inverter my Toshiba and Dell laptops run fine, but when I connect the Acer in the same manner it gets a little crazy in cursor control until it's unplugged from the inverter.

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Old 11-29-2014, 05:36 PM   #26
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Trailer: Escape 17 ft
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I fried an expensive short-wave radio when I got the polarity wrong on one of those 'universal' chargers.
Make sure you really understand the symbols etc.
What happens to the hole when the cheese is gone?
- Bertolt Brecht
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Old 12-17-2014, 08:07 PM   #27
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Trailer: U Hall VT
Posts: 438
We have used ours for the laptop for five years, no trouble
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