Originally Posted by
Yaatri
But can an inverter be used with any DC power supply?
Well, no. But most of them will have a specified range of voltages with which they can be used.
You can get inverters made specifically for cars and planes, such as:
http://www.worldtraveler.com/product_p/trv12196.htm (not an endorsement, I do not own this device.) It has an empower connector (specifically for planes) and comes with an adapter for cigarette-lighter-jacks such as those found in cars. I think having something like this plus your device's regular power adapter, you should be pretty much covered.