You will need first of all FULL SUN for hours and hours at every boondock site you camp at. Without sun, you will be screwed.
Why does this point seem to be "massaged" by solar panel proponents? I guess they can tolerate 120F interior temperatures. Or maybe they live in cooler climes?
MIRACLE POWER SYSTEMS! Come visit Mount McKinley, on Summer Solstice and you will not believe the powerhouse delivery of your solar panels!
Once I pass the "how much sun is there?" point, then I start in on serious planning or abandon things entirely.