One for the Sparks

Submitted: Sunday, May 24, 2009 at 17:30
ThreadID: 69132 Views:1878 Replies:4 FollowUps:14
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I am wondering about running/charging a laptop with a DC converter, rather than through a through a 240 v inverter. Laptop needs 19v from 12v DC. is this the way. I can not see why I should take 12v through to 240 and then down to 19v.
and suggestions. if DC is the way, where to purchase. Steve

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Reply By: Geoff (Newcastle, NSW) - Sunday, May 24, 2009 at 17:36

Sunday, May 24, 2009 at 17:36
Hi Steve,
Dick Smith and I think Jaycar will sell you a gizmo called a Kerio adaptor.

This is the device you need.

Plug the Kerio into the ciggy socket and the other end into your laptop.

The Kerio will fit a multitude of laptop voltages by using a plug in bias resistor. The resistor looks exactly like a blade style fuse holder but it really isn't, it's used to adjust the Kerio output to in your case 19 volts.

Geoff

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Follow Up By: Member - Graham H (QLD) - Sunday, May 24, 2009 at 17:46

Sunday, May 24, 2009 at 17:46
Projecta also make them and for about $69 against over $100 for the Kerio.
Battery world had the one I got .

Make sure you buy a 6000ma model as anything smaller will run very hot.
Been there done that got the big one and it happily runs it in the car playing my music while we drive.

Cheers
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Follow Up By: Geoff (Newcastle, NSW) - Sunday, May 24, 2009 at 17:52

Sunday, May 24, 2009 at 17:52
Hi Graham,

Thanks for that, I didn't know Projecta made them as well!

Filed for future reference,

Geoff

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Follow Up By: Member - steveinoz (NSW) - Sunday, May 24, 2009 at 18:14

Sunday, May 24, 2009 at 18:14
Thanx for the quick response. will check them out. cheers Steve...

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Follow Up By: Member - Barnray (NSW) - Sunday, May 24, 2009 at 18:27

Sunday, May 24, 2009 at 18:27
I have found that using the inverter is better, I have a laptop that needs 19v and the projecta frizzled under load. Barnray
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Follow Up By: Member - Graham H (QLD) - Sunday, May 24, 2009 at 18:38

Sunday, May 24, 2009 at 18:38
Yes but which one were you using There is a 3000ma model which isnt powerful enough.
My netbook and my Compaq 15 in both run quite happily off a 6000ma model.
However some Toshibas and HP's are power hungry and may not run on them.
AS I wouldnt own one it hasnt bothered me

What make is the original poster using

Using an inverter in a car will "light up your life"if someone drops a drink on it .
Dont see the sense in upping a voltage to drop it down again.







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Follow Up By: Member - Barnray (NSW) - Sunday, May 24, 2009 at 19:03

Sunday, May 24, 2009 at 19:03
6000ma. b
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Follow Up By: Member - steveinoz (NSW) - Sunday, May 24, 2009 at 19:28

Sunday, May 24, 2009 at 19:28
If you mean the original post on the subject, I have a 300 watt inverter. H P Pavilion Dv6. taking 19 volt input. Cheers Steve...

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Follow Up By: Member - John and Val W (ACT) - Sunday, May 24, 2009 at 19:51

Sunday, May 24, 2009 at 19:51
Geoff,

There are lots around, and you're quite right in thinking it's better to go from 12V to 19V rather that 12-240-19. Check the current (amps) rating on your 240V to 19V converter. You'll need an adapter with (at least) that current rating. Jaycar, Dick Smith, lots on ebay....

Note that many come with lots of plugs, one of which should fit your laptop, AND some can be connected wrong way round so that + and - 19V are reversed. Don't get it wrong - very expensive!!

HTH

John
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Follow Up By: Member - Barnray (NSW) - Sunday, May 24, 2009 at 20:46

Sunday, May 24, 2009 at 20:46
With the converter and 19v I think you will find that it has to output about 6amps to run the laptop and thats its undoing. Most converters in this range are about 6amp output which is a lot of heat.But its your money. B
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Reply By: Wayne's 60 - Sunday, May 24, 2009 at 21:06

Sunday, May 24, 2009 at 21:06
G'day Steve,
First up, you don't indicate the type of machine you wish to power.
We went through a similar process recently with our Dell PC when planning for our road trip, the PC was to be used as a platform for saving pictures off the camera. SWMBO searched through e-bay and for less than $40.00 AUS purchased a 12 volt power supply specific to the Dell and we have had no problems with it.

Keep it simple and specific.

Hope this helps.

Cheers,
Wayne & Sally.
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Follow Up By: Member - Graham H (QLD) - Sunday, May 24, 2009 at 21:19

Sunday, May 24, 2009 at 21:19
He posted he has a HP and my 6 amp converter runs my machine for up to 6 hours a trip playing my 12,000 songs on our trips and doesnt get unaccepably hot.
The 3 amp one was Ok till the machine got to do something and it soon heated up.
I can use Photoshop doing editing with the 6 amp one and it stays relatively warm but not unduly so.

The Dell's are different to all others and have their own proprietry power supplies.

Just about all others can be run from a converter as it has a selection of connectors to fit various makes EXCEPT Dell
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Follow Up By: Wayne's 60 - Sunday, May 24, 2009 at 21:35

Sunday, May 24, 2009 at 21:35
Hi Graham,

Must've missed the info on the machine type post, when I was replying.

Cheers,
Wayne.
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Follow Up By: Sand Man (SA) - Monday, May 25, 2009 at 19:21

Monday, May 25, 2009 at 19:21
Wayne has identified a unique problem to the Dell laptop.

Although a 12 volt adapter of the appropriate type will run a Dell, it will not charge the battery and therefore you may need to use an inverter if you with to charge the internal battery of the laptop.

My Dell laptop had an optional accessory which I was fortunately able to purchase. It is a power adapter (looking identical with the original supplied unit) but with two supply leads. One is a 240 volt lead and the other is for 12 volt DC and airplane input voltages.

Bill.


Bill


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Reply By: Rangiephil - Sunday, May 24, 2009 at 22:30

Sunday, May 24, 2009 at 22:30
Just be warned .
My 3 amp Projecta blew up and must have damaged the power supply of the laptop as it now will not boot reliably. The Laptop 240 volt supply was 3 amp, so Projecta amps must be somehow smaller than NEC ones.

So there is more at stake than just the power supply.
Regard sPhilip A

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Follow Up By: TerraFirma - Monday, May 25, 2009 at 04:25

Monday, May 25, 2009 at 04:25
3amp is on the low side hence why it mosy likely failed and I doubt it's failure would effect the booting of the machine. The booting issue could be a myriad of things.
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Follow Up By: Member - Oldplodder (QLD) - Monday, May 25, 2009 at 08:34

Monday, May 25, 2009 at 08:34
My laptop takes 4 amps to run. I checked the output of the 240v power pack.
Sometimes I find it easier to run the laptop off the laptop battery, then recharge the laptop battery in the car during the day using my Jaycar 12v/19v charger.

Usage while running the laptop depends on how hard you are running the lap top and using all the accessories like the DVD/CD reader.
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Reply By: Member - steveinoz (NSW) - Monday, May 25, 2009 at 16:19

Monday, May 25, 2009 at 16:19
Thanks to everyone for the info. As I said I could not see why you would go from 12-240-19, when you can go from 12 to 19. Will check out DS, Jco and see what they have.

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