Solar charger for iPhone5 DIY plug icon instead of lightning bolt?

I'm building a solar charger for my iPhone 5 and I'm almost there! I've run the circuit through a 12v power supply and the circuit works on my breadboard and the lightning shows up. I'm pulling around 18v with my solar panel into my circuit yet the "plug" icon shows up instead of the lightning bolt icon. Any suggestions will help!

Either…

[1] Wrong connection.

[2] Not enough current produces by solar panel.

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