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Turn it off and on again, because that fixes literally everything (worked this time anyway). #solarpi
Looks like a supercapacitor and no battery did the trick (during the day at least) #solarpi
Do test run of solar system #solarpi
Charge it from the sun with no load, see if that fixes it #solarpi
Work out why it's still randomly turning off and not back on #solarpi
Put the whole thing together and see if it explodes #solarpi
Work out why this thing isn't booting #solarpi
Test cellular on a sunny day #solarpi
It wasn't a loose wire, there's something wrong with the switching or something #solarpi
Write about solar pi 
#dumb
Try running it without the battery pack, just solar + ultracapacitors #solarpi
Wait for the 4x18650 battery case to arrive to see if it's viable #solarpi
Bang head against mystery problem #solarpi
Wait for good 18650s to arrive #solarpi
Discover that the existing power supply sometimes shuts off output and doesn't turn it back on #solarpi
Charge it and try starting it up again to see if it was just a loose wire #solarpi
Duct tape enough insulation to run the solar system outside for a while #solarpi
Wait for: 5v regulators to arrive #solarpi