Solar Roller with 12x 4700uF capacitor?

I looked everywhere in my stuff to find a gold or aerogel capacitor. Looks like I don't have any left. And it was the middle of the night. What would you expect me to do?
Yes, I have parallel connected 12x 4700uF (and 1x 3300 in addition) capacitor to run this monster.
It has a simple 1381 solarengine. The special thing about this is I have made my own gear system to run it on problematic surfaces. It works pretty well. Charges for about 15 seconds under direct sunlight and runs about 15-20 cm at once.
I have built this one for my girl friend. I am a geek after all.

Here is the gearwork;
While working on the roller;