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 Post subject: Laptop charger (Dell)
PostPosted: Wed Dec 20, 2017 7:24 pm 
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I have about 4 laptop chargers for Dell. As it converts AC to DC (19v), can I chop off the mains part and put a 12v plug for the ciggy lighter to charge it?

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PostPosted: Wed Dec 20, 2017 7:46 pm 
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No, it's a/c to dc.

What you need is a 12v to 19v dc to dc adaptor/converter at the minimum amperage rating as the mains unit.

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PostPosted: Wed Dec 20, 2017 7:48 pm 
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Forgot to add,

I did have some at work, just a question of finding, will have a look
tomorrow.

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PostPosted: Wed Dec 20, 2017 8:46 pm 
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Mahesh the car is DC so if the AC part isnt here its just DC in and out isnt it?.

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PostPosted: Wed Dec 20, 2017 9:17 pm 
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At 12v it would be a very slow charge for the laptop, and no chance of charge and use at the same time.

I'll check at work if I can find the universal ciggy socket to laptop power supply, they are voltage adjustable and voltage regulated on the output, it's a question of where I put them.

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PostPosted: Wed Dec 20, 2017 9:21 pm 
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Ive just go the gist of it now lol. 19v and 4.62a needed :)

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Tony

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PostPosted: Thu Dec 21, 2017 5:23 pm 
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Hi Tony, One way of doing this is to use a 12V to 230Va.c. power inverter. Like one of these.

https://www.maplin.co.uk/search/?text=1 ... +converter

From experience they are not good at powering lighting loads as the cold input current is much higher.
Also some have pseudo sine wave outputs which some pieces of electronic equipment doesn't like as they electronically chop the voltage up and give high peak input currents. Maybe take the charger in and tell them what you need.
HTH,
Tony.


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PostPosted: Thu Dec 21, 2017 5:42 pm 
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You need a 12v to 19v DC-DC Buck, eg. https://www.amazon.co.uk/Supply-Convert ... B01EV59JZG

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Current fleet: Triumph Dolomite Sprint '75, Daihatsu Fourtrak, Honda CG125, Yamaha Fazer 600, Shetland 570

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PostPosted: Thu Dec 21, 2017 7:00 pm 
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When I used to be on sales I had to d quotes on the road, i bought a 150w inverter and it did the job admirably.
I also used it when camping for the 230v Air pump although rated at 200w the inverter coped for the very short time needed, as it spun like the clappers.

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PostPosted: Thu Dec 21, 2017 8:08 pm 
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You don't get something for nothing in physics, so 12v to 230v to 19v is massively inefficient!

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Current fleet: Triumph Dolomite Sprint '75, Daihatsu Fourtrak, Honda CG125, Yamaha Fazer 600, Shetland 570

Disposal fleet: Golf GTi 16v MK3 Anniversary

Past fleet: Triumph 2000, Lancia Beta Coupe, BL Mini Clubman, Austin Metro, Vauxhall Cavalier MK1 & MK2, Renault 18 D, Rover 216 GSI, Honda Accord (most expensive car purchase, hated it on pickup from dealer, was made out of magnetic metal as only car I've ever been crashed into, 4 times), Golf GTi MK3 16v x 3


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PostPosted: Thu Dec 21, 2017 10:16 pm 
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would this type be ok?
http://www.ebay.co.uk/itm/In-Car-Charge ... 2548.l4275

Tony

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PostPosted: Thu Dec 21, 2017 10:36 pm 
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Older Dell Lattitude's have a 7.4mm x 5.0mm barrel, so as long as the listing is correct, so yes in theory but they do not list the wattage in the listing. For example this model Lavolta charger http://amzn.eu/gHxAPj4 (sorry for all the Amazon links, they just handily have everything with specs) will work with a Dell Lattitude D610/D820 because it's 19v/90watt with a 7.4x5mm barrel even though the listing doesn't mention a Dell, it's £13.49 if you have an Amazon Prime account.

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Current fleet: Triumph Dolomite Sprint '75, Daihatsu Fourtrak, Honda CG125, Yamaha Fazer 600, Shetland 570

Disposal fleet: Golf GTi 16v MK3 Anniversary

Past fleet: Triumph 2000, Lancia Beta Coupe, BL Mini Clubman, Austin Metro, Vauxhall Cavalier MK1 & MK2, Renault 18 D, Rover 216 GSI, Honda Accord (most expensive car purchase, hated it on pickup from dealer, was made out of magnetic metal as only car I've ever been crashed into, 4 times), Golf GTi MK3 16v x 3


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PostPosted: Thu Dec 21, 2017 11:01 pm 
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No joy at finding one at work today, will have a good look over this weekend for you.

I had the uniross universal type, which is a lot better made than the ones on Ebay at the moment.

If you could post your laptop model number, the correct dc plug size can be ascertained.

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PostPosted: Thu Dec 21, 2017 11:17 pm 
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ok thanks Mahesh, mine is Dell latitude d630 with a fat round pin :)

Tony

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PostPosted: Sat Dec 23, 2017 11:15 am 
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You could get one of these::
https://www.ebay.co.uk/itm/New-Genuine- ... 3260981817

The only down side is at 65W it will not run a beast of a laptop while you play Crysis but on the up side nor will it melt your car wiring. It will run a laptop hard enough to watch a film, do general stuff or recharge it when off.

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