DC-DC power invertor is available for a long long time, either up or down
conversion is possible using switching technology, basically no AC is
necessary in between.
A good DC-DC invertor can have over 90% efficiency, with the up invertor
more efficient than down converter usually.
C.H.Ling
----- Original Message -----
From: "Moose"
> Simon Worby wrote:
>> You're thinking along the right lines, to my mind, but an inverter to
>> mains voltage and back to whatever the laptop wants (typically 15-18v DC)
>> is wasteful. You can buy a power pack for laptops that will take power
>> direct from 12v DC battery and convert it to the correct output for your
>> laptop.
>
> Unless someone has developed a new way to directly increase DC voltage,
> such a power pack must include an inverter.
>
> Whether inverting to a lower AC voltage and converting to DC is more
> efficient than going up to 110v (here) and back down for DC, I don't know.
>
> Moose
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