TLDR
- St. Lucie County averages 5.5 peak sun hours - excellent for RV solar
- 400W is the sweet spot for weekend rigs, 800W+ for full-timers
- Roof-mount monocrystalline panels are the durability winner
- MPPT controllers extract 20-30% more power than PWM
- Call 772-276-6465 for a custom system design
St. Lucie County is one of the better RV solar regions in the United States. Average daily peak sun hours run 5.5 - higher than most of the country - and the relatively flat angle of the Florida sun means roof-mount panels stay productive year-round. This guide walks through panel selection, controller choice, and what to expect when you install solar on a rig stored in Tradition, PGA Village, or anywhere along the Treasure Coast.
Why Solar Makes Sense in PSL
Two reasons. First, you can boondock at Savannas Preserve State Park, the Phipps Park area, and other regional spots without dragging an extension cord 100 feet from a buddy's RV. Second, your rig sits idle a lot - and solar trickle-charges the battery during storage, preventing the dead-battery surprise when you go to leave for a trip.
Even a single 100W panel keeps a stored battery topped off indefinitely in Florida sun. Skip the wall outlet and the battery tender.
Panel Type and Mounting
Monocrystalline panels (the all-black or dark blue ones) are 20 to 22% efficient versus 16 to 18% for polycrystalline. For roof space, that's the difference between fitting 600W and 800W on the same square footage. Always go monocrystalline.
Mount with VHB tape and Dicor lap sealant on a fiberglass roof, or with z-brackets and EPDM sealant on rubber. We use Renogy and Newpowa panels - both backed by 25-year output warranties and shipped to PSL within a week.
Charge Controller Selection
MPPT (Maximum Power Point Tracking) controllers extract 20 to 30% more energy than PWM at the same panel rating. For any system over 200W, MPPT pays for itself in two seasons. Victron SmartSolar 100/30 and Renogy Rover are our default picks.
PWM controllers are fine on systems under 200W where the cost difference matters more than peak efficiency.
Sizing for Real Use Cases
Weekend warriors with a residential fridge, LED lighting, and a CPAP need 200W to 400W. Add a roof AC running on solar (only feasible with 1,200W+ and lithium) and you're in full off-grid territory.
Most of our PSL solar installs land at 400W with one 200Ah lithium battery. That covers 3 to 4 days of moderate use without shore power. Pair with the lithium upgrade guide to size the battery side correctly.
Installation in Coastal Florida
Salt air from the Atlantic carries inland to Port St. Lucie. We use marine-grade tinned-copper cabling and stainless steel hardware on every install - copper alone corrodes fast in our climate. All roof penetrations get triple-sealed: butyl tape, Dicor self-leveling sealant, and a UV-resistant top coat. Our solar service covers panel mounting, controller wiring, and battery integration in a single visit. Request a free design consult at 772-276-6465.