Here are a few photos of my solar relay project with an external high capacity battery. I need to do some testing but the goal is to have the solar cell power the goTenna which in turn would charge the external battery. The solar cell is from Voltaic and is using their 5 VDC regulator. This should supply 5 volts to the goTenna. The battery and 5 VDC regulator are located in an otter box case under the solar cell in hopes to reduce the heat on both of them. I went with white PVC for the same reason to reduce heat on the goTenna unit. The very top cap will be left un-sealed to allow the unit to be turned on and off. I still need to poke some holes in the otter box case but by design they should not allow water in if I do the drip loops right.
This setup (not complete yet) is designed to allow it to be hung by rope, placed onto a tripod or a post / stick in the ground.
**Due to the picture formatting, you may need to click on the photo to see the whole thing.