Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Read the instructions!

This unit, and the 700 watt unit, clearly state in the instructions that th only way to get those wattages from them is by connecting them directly to the battery. That's why they provide the clamps for when you're camping or such. The wires and fuse for the lighter socket cannot handle that kind of current. It's perfect for a laptop, but trying to do much more than that will blow your fuse and you'll probably blame the inverter. This is a great little unit, but I only wish that it had an aux lighter socket on it so I can use my radar detector (maybe I should just obey the speed limit, some of those radars out there are too good for even my highest rated detector).