mppt vs pwm

Roof area is probably the only integer that can interfere with my cheapskate nature. Higher energy density per square foot can be costly. Down here, SHADY parking for RV's is a must. In one park I suffered 104F interior temperatures awaiting someone to pull out that had a shady site. Within 10 minutes of them leaving I had moved. Interior temps dropped to 82F. No hookups. This really tosses a coconut into the gears of the viability of solar panels.