12v Laptop Adaptor

Submitted: Friday, Jan 28, 2005 at 13:38
ThreadID: 19859 Views:3734 Replies:5 FollowUps:3
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Following on from the other thread.
Does anyone have an idea how they work?

My 240v power pack reads. Input 100 to 240v @ 2.0amps 50-60 Hz
Output 19v dc 6.3 amp.


What does all this mean?

Would an adaptor be able to run this from my aux battery drawing what amps?

I have some idea but would like to confirm it with those of you who know.

Thanks for any help.
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Reply By: joc45 - Friday, Jan 28, 2005 at 14:44

Friday, Jan 28, 2005 at 14:44
Ouch! 6.3amps is quite a lot for a laptop.
The power pack converts your AC mains power down to 19volts DC, a requirement of your laptop. If your laptop is using the full 6.3Amps, then this corresponds to about 120 watts power consumption (6.3 amps x 19 volts = 119.7 watts). So allowing for inefficiencies of your power pack, you will need about 130-140 watts input from the mains. This also means that you will need at least this power if you are using a 12volt - 240 volt inverter. Without getting too technical, in practice, you may need a lot more than this power capacity in the inverter.
140 watts from the inverter into the power pack will require about 160 watts input from the 12v supply, or about 13 amps.
But the good news is that the laptop only requires this 6.3 amps briefly, when the internal battery is charging and all drives are running. You may find that the consumption will drop to about 1/3 of that once up and running, and battery fully charged. Even less again if you have set up power saving settings in your laptop.
Alternatively, Dick Smith's and a few others sell a direct 12v - 19v converter, which cuts out some of the conversion inefficiencies of using both a power pack and an inverter. Tho you might have trouble sourcing one that supplies 6.3amps. If purchasing one of these, you have to be very careful that you set it to the correct output voltage and get the polarity right. There are no second chances if you get it wrong.
AnswerID: 95399

Follow Up By: Flash - Friday, Jan 28, 2005 at 17:05

Friday, Jan 28, 2005 at 17:05
Further on this.
I have one of these adapters from DSE (Kerio Energy Knight)
It will run my Acer Pentium 4 OR charge the battery, not both at once, ie: if the battery is flat, I need to charge it B4 using the laptop, OR remove the battery to use the computer.
Apart from that it is great.
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Follow Up By: Noosa Bushtrackers - Friday, Jan 28, 2005 at 20:43

Friday, Jan 28, 2005 at 20:43
We also use the Dick Smith 12 volt to 19 volt adaptor with our Lap top which is especially good for when you have a mapping program running connected to your GPS. It allows the Laptop to run without any battery problems.
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Reply By: Member - Raymond - Friday, Jan 28, 2005 at 17:03

Friday, Jan 28, 2005 at 17:03
Hi Dodger
I had a similar problem when looking for a power supply for the IBM Think Pad. I ended up getting an Inverter 300watts which powers the laptop with ease.
AnswerID: 95407

Reply By: drivesafe - Friday, Jan 28, 2005 at 17:23

Friday, Jan 28, 2005 at 17:23
Hi Dodger, the inverter may not be the most efficient way to go but it is by far the best idea if you have anything else that you can use it with, such as camera battery charges, electric shavers and so on.
The uses for an inverter is only limited by your imagination.

The size of the inverter is the only thing you have to decide on, and that should be based on your perceived uses.

I have 2 different inverters that I use regularly, a 130 watt that I keep in the 4by at all times, for charging camera batteries and to run my lap top.

I also have a 750 watter at home and unfortunately get to use it a lot because of all the blackouts we have. I use the 750 to power a lap lop, wide screen TV, VCR, DVD player and 2 low power fluros all at once. The longest I have used this set up is 11 hours straight using the 4by’s battery and had no trouble starting the 4by next morning.

Hopefully, this will give you some ideas to ponder.
AnswerID: 95408

Reply By: ralphy - Saturday, Jan 29, 2005 at 00:50

Saturday, Jan 29, 2005 at 00:50
I have a Dell Inspiron 5150 which runs from a 130 w AC adaptor with an output of 19.5V, 6.7 A and inputs of 100-240V, 2.5A
Had the devil's own job finding a 12 volt dc car adaptor for it. Eventually tracked one down specifically for the 5150 from Lind Electronics (www.lindelectronics.com) in the good old US of A. Arrived yesterday. Not tried yet.
Site worth a look I reckon.
AnswerID: 95475

Follow Up By: timglobal - Saturday, Jan 29, 2005 at 10:32

Saturday, Jan 29, 2005 at 10:32
For what it's worth, I'd recommend the Kingston which is a combined 12/24 and 110/240v charger. One lead for mains (comes with oz plug) and a 12v car lighter or aircraft seat adaptor. Comes with a raft of changeable power lead ends which even fit macs and Dells. All stores in nice little pouch.
Good for computers, GPS / CB, music players, power and charging anywhere. Also has connection for mobile phone / pda lead which I don't have. Very pleased with purchase, so $200+ price tag justified by flexibility.
I sound like a salesman (i'm not!) but it has saved me a bag of leads and chargers so very pleased.
FollowupID: 354253

Reply By: Member - Jiarna (SA) - Saturday, Jan 29, 2005 at 11:45

Saturday, Jan 29, 2005 at 11:45
I use a 12V to 19V adapter which I think would be more efficient than converting to 240V then back to 19V (not to mention cheaper).
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