Most RV solar installations use flat-mounted panels because they’re simple and avoid wind resistance while driving. But flat panels can lose 30-40% of their potential power generation compared to properly angled systems, especially during fall and winter months when the sun sits lower in the sky.
The optimal angle for solar panels changes throughout the year and varies by your latitude. In summer, a flatter angle (around 15-25 degrees) works well, but in winter, steeper angles (45-60 degrees) capture significantly more sunlight. Many boondockers discover this the hard way when their solar system that worked great in summer suddenly struggles to keep batteries charged during cooler months.
Adjustable tilt mounts offer a middle-ground solution that many RVers overlook. These allow you to change the panel angle when parked, giving you much of the benefit of optimal positioning without the complexity of tracking systems. The trade-off is setup time and the need to remember to adjust them as seasons change.
For full-timers who spend months in one climate, the calculation changes. If you’re snowbirds who stay in Arizona all winter, flat mounts might work fine. If you’re chasing moderate weather and find yourself in northern states during shoulder seasons, adjustable mounts can make the difference between running a generator daily or staying off-grid comfortably. The key is matching your mounting choice to your actual travel patterns, not just picking the simplest installation.