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Solder up a 5v regulator to the solar cell and USB micro output #solarpi
Wait for good 5v regulator to arrive #solarpi
Wait for: 5v regulators to arrive #solarpi
Discover the "good" 18650s were unprotected and as such a small explosion risk #solarpi
Put the whole thing together and see if it explodes #solarpi
Solder up supercapacitor USB lead #solarpi
Find/purchase a better charging/USB apparatus that can hold 4x 18650s and won't explode #solarpi
Discover that the existing power supply sometimes shuts off output and doesn't turn it back on #solarpi
Charge the 4x18650 pack #solarpi
It wasn't a loose wire, there's something wrong with the switching or something #solarpi
Wait for good 18650s to arrive #solarpi
Turn it off and on again, because that fixes literally everything (worked this time anyway). #solarpi
Work out why it's still randomly turning off and not back on #solarpi
Find a viable solar charge controller that can handle 4x18650s #solarpi
Write about solar pi 
#dumb
Test cellular on a sunny day #solarpi
Work out why this thing isn't booting #solarpi
Charge it from the sun with no load, see if that fixes it #solarpi
Assemble v2 build #solarpi