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Looks like a supercapacitor and no battery did the trick (during the day at least) #solarpi
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Charge it from the sun with no load, see if that fixes it #solarpi
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Do test run of solar system #solarpi
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Install supercapacitors #solarpi
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Charge the 4x18650 pack #solarpi
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Find a better battery pack that can charge and supply power at the same time #solarpi
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Test cellular on a sunny day #solarpi
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Charge it and try starting it up again to see if it was just a loose wire #solarpi
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Wait for the 4x18650 battery case to arrive to see if it's viable #solarpi
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Work out why this thing isn't booting #solarpi
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Put the whole thing together and see if it explodes #solarpi
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Wait for supercapacitors to arrive #solarpi
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It seems to be working?! #solarpi
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Turn it off and on again, because that fixes literally everything (worked this time anyway). #solarpi
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Discover that the existing power supply sometimes shuts off output and doesn't turn it back on #solarpi
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Solder up supercapacitor USB lead #solarpi
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Work out why it's still randomly turning off and not back on #solarpi
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Assemble v2 build #solarpi
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Wait for good 18650s to arrive #solarpi
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Find a viable solar charge controller that can handle 4x18650s #solarpi
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