laptop charging

Submitted: Wednesday, Jun 02, 2010 at 19:45
ThreadID: 79006 Views:2719 Replies:6 FollowUps:4
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hello members need to no which is best thing for charging a laptop of a dual batt sys or is it possible . thanks mick
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Reply By: Member - Danny R (QLD) - Wednesday, Jun 02, 2010 at 19:51

Wednesday, Jun 02, 2010 at 19:51
Depends on your lappie. Most will have a car kit which you can use. There are also some generic ones on FleaBay etc. You just have to watch that the non-genuine ones can deliver enough current for your application. I have an ASUS Eee PC which expects 12v, so I just use a direct cig lighter connection to my second battery to charge it. Works a treat.
AnswerID: 419284

Follow Up By: Member - michael (BOXHD) r (VI - Wednesday, Jun 02, 2010 at 19:55

Wednesday, Jun 02, 2010 at 19:55
thanks danny i have a hp pavilion dv7 if that makes any sense to u some ppl say sine wave and some say pure sin wave so i not sure wht i need cheers mick
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Follow Up By: Member - evren1 (WA) - Friday, Jun 04, 2010 at 13:58

Friday, Jun 04, 2010 at 13:58

have exact same laptop.

I bought genuin HP 12 V charger off ebay. you can't go wrong! Charges fine off my dual battery set up in car and camper.

Despite the cost of living, have you noticed how popular it remains!

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Reply By: ABR - SIDEWINDER - Wednesday, Jun 02, 2010 at 20:47

Wednesday, Jun 02, 2010 at 20:47
Can you send me the plug size and a photo if possible and I will see if one of our new tips on the 90W charger will fit.


Derek from ABR
AnswerID: 419290

Reply By: Steve and Viv - Wednesday, Jun 02, 2010 at 20:50

Wednesday, Jun 02, 2010 at 20:50
The Sine Wave thing is only if you are planning to use 240 volt. The question with that is why... You are far better to *convert* 12 to 17-19 volt or what ever your lap top needs. This is also safer that inverting 12 to 240, well it is if your on the move but there is less waste in converting rather than inverting. You can get good converters form places like DickSmith etc. Just make sure you look at the bottom of your PC and what ever you buy can deliver the power voltage and amps at 12 volts.
AnswerID: 419294

Follow Up By: Ianw - Wednesday, Jun 02, 2010 at 23:16

Wednesday, Jun 02, 2010 at 23:16
errr, the problem with DC (12v) is that it cannot be converted or transformed into a higher voltage with out going thru conversion to AC, then a transformer to the higher voltage and then rectified back to DC. (i.e an inverter). These 12v to 19v converters are still inverters; they just don't convert to 240v 50hz.
By using a high frequency they can be made a lot smaller and are more efficient than the 50hz ones. BTW if your lappy needs 5 amps, that is 5 amps at 19v, not 12v! Probably pulling 8 amps of 12v.

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Reply By: Maîneÿ . . .- Wednesday, Jun 02, 2010 at 23:45

Wednesday, Jun 02, 2010 at 23:45
I use a 300 watt Pure Sine Wave inverter

Gwwgle "inverters" and read the difference between Pure sine wave and those that are NOT pure sine wave
(that way I can't be held responsible for the results :-)

If I thought a cheaper non-pure sine wave was as good I would have saved money and bought one, but obviously I don't, so I didn't.

They can power any *realistic* 240v appliance you have with you.

Maîneÿ . . .
AnswerID: 419320

Reply By: Maaate - Thursday, Jun 03, 2010 at 06:29

Thursday, Jun 03, 2010 at 06:29
I found that when using a cheap modified sine wave inverter, I am able to power my ASUS laptop, but not my IBM Lenovo. (Using the 240V power supplies for both computers.)

I have no idea of the technical reasons, but it seems that some computers are more 'sensitive' to the power input.
AnswerID: 419333

Follow Up By: Ianw - Thursday, Jun 03, 2010 at 19:13

Thursday, Jun 03, 2010 at 19:13
I have an "IBM" Lenovo. It runs well on a $20 12v to 19v converter from Ebay.
Battery is fully charged in 30 mins.

FollowupID: 689584

Reply By: Member - Laurie K (WA) - Thursday, Jun 03, 2010 at 09:04

Thursday, Jun 03, 2010 at 09:04
I have used Modified Sine Wave inverters and had problems. I knew I was doing the wrong thing when I bought it. Have just purchased a Projecta Pure Sine Wave 150w inverter, plugs straight in, and works a treat.
They are more expensive, but ya pay peanuts, ya get peanuts. The power delivered is clean power, NOT a hybrid power.
Incidentally, a plug for the guys who sold it to me. I was in Mt Isa, shopped around knowing that I wouldn't get one in town, but was helped heaps by the girl at Dick Smith (who only had Modified inverters the same as the one that died on me, but rang around other companies in town), and the guys at Auto Pro, who researched it, rang me back 3 times, ordered it, and had it for me as promised at 1pm the next day.

Laurie Kibblewhite

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