I was excited to get my sense installed this weekend. I live in Colorado and the fire code for new homes has the panel outside. I contacted sense about this because I was concerned of the high and low temperatures outside. They recommended installing outside of the panel in a water proof box. I just wanted to post for anyone else how I got this done. My father is a master electrician and I worked for his company in my younger years, so I have electrical experience. PLEASE consult an electrician as working in a panel can be very dangerous.
I found an outdoor electrical junction box at home depot. I had to create my own holes for connectors and the antenna using 1/2" drill bit. I used 1/2" flexible wire tubing and water proof connectors to connect from the junction box to the panel. I was a little worried that 1/2" would be too small for the connectors sense uses but I was able to barely fish in all connectors. I first fished the connector that as the ‘claws’ to sense power from the main panel back to sense’s box. I then fished the actually power connection end from sense’s box to the panel. This way I did not have to fish the power connection connector through the 1/2" line (as the other side only had wires). This worked well and made it easier.
The sense box sits under my sub panel. There was no room to easily put it under my main panel. Luckily I had enough slack for each cable to reach my panel. No picture of the inside of my panel because I am embarrassed at the sloppy mess the original electrician did!