Laptop Battery

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

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

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

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 . . .

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

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

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.