The user manual appears to be written by a non native english speaker. Somewhere I read that the AIO is manufactured in China but designed in the US. Because of the user manual, I wondered if the PowerFlow was designed in China. I don't have a good history with Chinese designed products. That being said, I am happy with my Longi solar panels (2 years on). If the PowerFlo is Chinese designed and MidNite really has confidence in the design, MidNite should really spend a little effort to edit the user manual.