Of course, we want the panel mount jacks to be panel mounted. Grab the box end piece. It's made of ABS…

Which means they're very easy to drill or machine!

We have a label maker so we made nice little labels!

The other side gets the precut case that covers the Arduino power and programming slot.

Ready to go! Here I show how I can try different panels by connecing alligator chips. The lipo input is from the passthrough connection on the charger. As the panel charges the battery I can track the voltages and current.