Call me paranoid. I have a couple of inverters here that are grid connected and I made sure everything that allowed outside connectivity in the box mysteriously stopped working. A little bit of RF knowledge goes a long way with stuff like that. It was interesting to see how many ways it tried to do this. Fortunately it kept working even without connectivity. Configuring the things is a pain though, the display and buttons are clearly not meant to be used that way but it does work.