Oil sucks, wind blows.
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Also teach a little energy economics too
PV hood ornament Barbie will have a cow
Make 4 cardboard panels the same size as the PV box. Cover one side of each panel with foil and hinge them to the 4 sides of the PV box.
For charging, unfold so that they all stand at a 45 degree angle. This will multiply your PV output without adding much weight or expense.
This is a good idea and seems to provide more amps during peak solar times and I thought this extra heat would effect the panels but they cookin and crankin.