Solar battery charger
You forgot a diode between L1, C3.

Take 2:
Not all  pusblished designs work!
This one is very fussy and not very efficient and the battery charger article discusses some variables. Not shown is self capacitance of inductor and ESR of caps.

The model and actual RC and RLC values for each reactive part matters and not just C or L.

Also spurious oscillations can occur.  

Try adding 200 ohms in series with C2. This adds stability to the loop with phase lead/lag compensation. Then lower ESR of pile from 22 to 5 ohms.