Hello, guys. Thanks for you post. As I know about power inverter, 400w DC 12v to AC 110v power inverter is the only charger for me when camping in the countryside. Since I'm used to charge shaver and camera battery with this inverter. Easy to connect it with car cigarette lighter charger outlet, then we can laptop, phone and other tools in the same way. The advantage that I know about it is soft and convenient to take away, easy to handle. Maybe you can catch more information about it on bestekmall. Hope this point is useful to you.