I have solar panels at home and I know some tricks to get more power when you put your solar panels in the sun. Having reflectors, mounts and glass will give you a better charge.
Step 1: Reflectors
Angling reflectors will create more sunlight for the solar panels. I took aluminum foil and wrapped it around cardboard and the taped it together on the back.
Step 2: Glass and Plastic Over Panels
Glass and plastic allows weaker solar panels to give more power. Having glass helps a lot especially if you are using a solar oven. As you can see in the picture you can barely see the cell but almost all of the panel is glass. This is probably is a .5volt solar panel but charges 6 LEDs. (It's from a garden light)
Step 3: Mounts
Depending where the sun is or your elevation, you can create a mount made out of cardboard to angle your solar panel.