Laptop Battery

Submitted: Saturday, May 01, 2010 at 19:00
ThreadID: 78143 Views:2659 Replies:7 FollowUps:5
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Can someone help me please! I have a laptop battery 14.8v 2000 mAh
What size inverter would I need to run the laptop. At the moment I have a Dick Smith 300 watt inverter, but it won't run the laptop.

Thanks
ronrox
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Reply By: Member - joc45 (WA) - Saturday, May 01, 2010 at 19:10

Saturday, May 01, 2010 at 19:10
Hi Ronrox,
it's not the battery capacity per se that is the problem. Some laptop AC adaptors don't like running off smaller-capacity inverters or modified sine wave inverters.
A solution is to go to a true sine wave inverter, or better still, use a 12vdc to 19vdc converter. This is more efficient and a neater way of doing it. Check the output voltage of your AC adaptor and its current capacity. It will probably be about 19v, 4amps. Some laptops are a bit more in amps. You can buy a converter from Jaycar or Dick Smiths for about $40, which will do the job nicely. Comes with a whole range of dc plug adaptors to suit your laptop. The output voltage is selectable to suit your laptop. Just make sure you set the correct voltage before turning it on, and make sure the the adaptor plug's polarity is correct.
Gerry
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Follow Up By: Member - joc45 (WA) - Saturday, May 01, 2010 at 22:43

Saturday, May 01, 2010 at 22:43
Jaycar's unit is here.
I bought one of these recently from HK for about $20 and works fine. Works in both a car and aircraft. Looks like it'll suit your needs. Free postage as well.
Gerry
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Reply By: Member - Fred B (NT) - Saturday, May 01, 2010 at 19:10

Saturday, May 01, 2010 at 19:10
First, you need to look at the power supply for the laptop. It will give you say: Input 110-240V 1.6 Amps. It will also give you say: Output 18V= and 7.4 Amps. You need both sets of info if you want both an AC and DC supplies. Then I can help you.
regards
Fred B
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Follow Up By: ronrox - Saturday, May 01, 2010 at 22:04

Saturday, May 01, 2010 at 22:04
thanks Fred

the input is 100-240v 1.7 Amps
the output is 19v 3.42Amps

ronrox
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Follow Up By: Member - Fred B (NT) - Saturday, May 01, 2010 at 22:42

Saturday, May 01, 2010 at 22:42
At those rates you will need an inverter that can handle a minimum of 400 Watts or a suitable adapter that can handle a minimum of 65 Watts.
regards
Fred B
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Reply By: outsider - Saturday, May 01, 2010 at 19:13

Saturday, May 01, 2010 at 19:13
You would be better off getting a 12 adapter. more efficient than converting 12 volts to 240 and back down to the laptop voltage.

Something like THIS
AnswerID: 415016

Follow Up By: Member - Fred B (NT) - Saturday, May 01, 2010 at 19:24

Saturday, May 01, 2010 at 19:24
If your latop requires 19V and 4.7Amp, then you will require a 90Watt adapter as per the 72W one in the link above above.
regards
Fred B
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Follow Up By: Ianw - Saturday, May 01, 2010 at 22:40

Saturday, May 01, 2010 at 22:40
The one in the LINK will be fine. Plenty of power (5A). Heck of a lot cheaper if you are game to get one from Ebay China. (less than $10) I did and have no probs at all.

ian
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Reply By: Maîneÿ . . .- Saturday, May 01, 2010 at 19:30

Saturday, May 01, 2010 at 19:30
I run my laptop from my PSW 300 Watt inverter without problems, it runs the fridge, lights and laptop simultaneously.

Maybe you have a faulty inverter, connections or wiring?

Image Could Not Be FoundMaîneÿ . . .
AnswerID: 415017

Reply By: Ianw - Saturday, May 01, 2010 at 20:14

Saturday, May 01, 2010 at 20:14
I bought a $20, 12v to 19volt laptop power supply of Ebay from Honkers and it works fine. Has the battery charged in half an hour no probs !!

Ian
AnswerID: 415023

Reply By: farouk - Sunday, May 02, 2010 at 18:43

Sunday, May 02, 2010 at 18:43
I have been using a 150 watt inverter for years to charge a laptop battery to 19v 3.95 amp and no problems so I would say you have a faulty inverter. Farouk
AnswerID: 415132

Reply By: Steve and Viv - Sunday, May 02, 2010 at 18:52

Sunday, May 02, 2010 at 18:52
Yes, strange it won't run, maybe the modified sine, anyway, I also use a 300 pure sine wave inverter when camped. When on the road as our laptop runs ozie I use a DC to DC converter. I prefer 12volt when on the move and it's just convenience to use 240 when I have the power brick set up to charge other gear.
AnswerID: 415134

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