Step 4: Pre-wire the solar cells
My solar cells have their terminals on the back side, so I needed to wire them before gluing them down. Decide how you will lay out the solar cells on the helmet and wire two pairs where a solar cell "+" is connected to a solar cell "-". Also attach wires to the lone "+" and "-" terminals.
I forgot to take a picture of the back side of the solar cells before mounting them, but it's pretty straight forward.