We know a lot of you have been experimenting with rooftop/solar powered relays. Here is our recommendation based on our work in NYC with the RISE program.
Biolite Solar Panel 5 https://www.bioliteenergy.com/products/solarpanel-5
Simply turn on a mesh unit and set it on relay mode, then adhere the unit to the side of the pak with double sided tape, place solar panel in the pak, plug the solar panel into the mesh unit with any standard micro-USB cable. Once you have the node assembled, you can use plastic zip ties or other fastening method to mount the node on your roof. Make sure to position the bag in a way that it will absorb the most sunlight possible throughout the day.