Thursday, Apr 26, 2012 at 17:49
For the most efficient use of the 12v power it is best to use a 12 dc to dc charger which, although it sounds like 12v only, it actually steps up the voltage and outputs dc at 19vdc.
Some of these are adjustable eg 15vdc up to 24vdc.
You can get them from Jaycar,
mine is a Powertech and has a selector for 15,16, 18,19, 20, 22and 24vDC with a selection of plugs to suit various Laptops.
If you use an inverter to power the there is more cords etc and the inverter will draw a lot more amps to do what is effectively a double loss conversion of the 12v.
It will work but not the most efficient way.
Your choice, I have the option of both and use the 12vdc/dc19v converter by choice.
Just a warning with inverter use: not all switchmode power supplies for laptops will start on a normal Modified SIne wave inverter, more accurately, a modified square wave inverter.
This type of wave form is messy and chuncky and is usually not suitable for use with sensitive electrical equipment. It may work but WILL make it run hotter than normal, read burn out of powersupply is quite possible.
Full sine wave = no problem.
Your choice overall, both dc/dc and inverter have their place.
Ross M
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