this is driven by BH's FLED SE and uses a huge solar panel (panasonic BP-242221, 5.5V) and charges quickly. the trigger is a Radio Shack red FLED covered in military ink which i believe impares the bot in noon time light and in my opinion are junk which should be avoided. in such bright light i need to cover 1/2 the panel to get any movement otherwise the engine locks up and just sits there. however in almost no light the engine runs great (under flouresent light from 15' away it fired every minute or so). i added a 6.8uF cap across the motor terminals to make it turn on harder.
Circuit