There is a new 90W Opus (not on their site) that is a little cheaper and will power a Mini ITX computer and accesories with no problem. It has the cranking problem fixed as well as it allows the proper shutdown of a Windows OS before shutting off the power supply.Originally Posted by camsgs3
What is the difference? Well, aside from the above 2 items, with a Opus you are just converting the car DC to 12V DC for the computer, whereas with an inverter, you are converting car DC to 110AC then back to the 12V DC inside the computers power supply. This is very inefficient. There is also the point that the Opus uses the cars ignition to start-up (and to shut down obviously) so there is no need for a switch to turn things on/off
Right now, for the money I would say Opus is the only way to fly if you want to do things right for a non-technical person.