Mobile RV Solar Panel System Installation Across Florida

Florida produces more solar energy per panel per year than any other state east of the Mississippi - and more than most western states as well. The continental US national average sits around 4.0 to 4.5 peak sun hours per day. Florida's statewide average runs 5.5 to 6.0 peak sun hours, with the southern peninsula - from Fort Lauderdale to Key West - consistently reaching the upper end of that band throughout the year rather than only in summer. A 200-watt panel on a Florida roof produces roughly 1,100 to 1,200 watt-hours on a good day. That same panel in Seattle, where the annual average drops to 3.5 peak sun hours, produces around 700. The practical implication for RV owners is that Florida is one of the few places in the country where a modest roof system can genuinely sustain a full-time boondocking lifestyle for most loads - provided the system is designed correctly from the start.

Written by Jesse Marcer, founder of Triton RV Repair. RVIA-certified technician with over a decade of mobile RV service across Florida since 2014. Last updated September 2026.

The first question most owners ask is how much solar they need. The correct answer always begins with the same step: a load analysis. Until you know how many watt-hours per day your coach actually consumes, no panel count or battery size can be called correct. We have seen coaches with 400 watts of solar that were dramatically over-built for how the owner used the vehicle, and coaches with 800 watts that still ran out of power by mid-afternoon because the battery bank was undersized. The math starts with the loads, not with the panels.

What makes a Florida-specific design different from a generic solar guide is the irradiance advantage. Because the sun delivers more energy here per day, Florida owners can often achieve their goals with fewer panels than they would need in other states. The flip side is heat: panel efficiency drops roughly 0.4 to 0.5 percent per degree Celsius above the panel's rated temperature of 25C. On a Florida summer afternoon, a roof-mounted panel surface can reach 65C or more, reducing output by 15 to 20 percent from its rated specification. This is why real-world system sizing in Florida uses a derating factor rather than simply multiplying rated watts by peak sun hours.

Why Load Analysis Is the Non-Negotiable First Step

Every component decision in a solar installation - panel wattage, controller amperage, battery capacity, wire gauge, fuse sizing - flows from one number: your daily watt-hour consumption. That number is not the same as your shore-power electric bill. RV solar systems run on 12-volt DC power, and the calculation must account for DC loads directly and AC loads through an inverter's efficiency (typically 85 to 90 percent). A 60-watt DC fan running 8 hours costs 480 watt-hours. A 300-watt residential refrigerator compressor cycling 30 percent of the day costs roughly 2,160 watt-hours. Add a CPAP machine, phone charging, LED lighting, a water pump, and occasional laptop use, and a modest coach can easily consume 1,500 to 3,000 watt-hours per day - a number that determines whether a 400-watt or 1,200-watt solar system is the right tool.

Our design consultation includes a roof survey and a systematic load analysis. We go through every circuit in the coach, note the draw of each device, and estimate realistic daily run times. From that we calculate the target battery capacity (sized to provide two days of autonomy without sun, at 80 percent depth of discharge for lithium), the panel wattage to fully recover that capacity on a Florida day, and the controller current to connect them. This process consistently surfaces surprises. A coach that the owner believed was modest frequently turns out to run a 12-volt residential refrigerator that alone consumes half the assumed battery budget.

MPPT vs PWM Controllers - Why the Difference Matters in Florida

A PWM controller works by directly connecting the solar panel to the battery and tapering the charge current by rapidly switching the connection on and off. It is simple, reliable, and inexpensive. The problem is physics: a PWM controller is only efficient when the panel's operating voltage closely matches the battery's charging voltage. A 12-volt battery in bulk charge sits at roughly 14.4 volts. A 200-watt 12-volt panel has a maximum power point voltage (Vmp) of roughly 18 to 20 volts. A PWM controller pulls the panel down to battery voltage to charge it, discarding the headroom. In morning and evening light, when the panel is not at its peak anyway, this is a modest loss. Under Florida's midday sun when irradiance is highest, a PWM controller can waste 20 to 30 percent of available capacity relative to an MPPT unit.

An MPPT controller uses a DC-to-DC converter to track the panel's actual maximum power point - the voltage-current combination that extracts the most watts from the panel at that moment - and then steps that voltage down to the correct charging voltage for the battery. Under strong Florida irradiance, the gain is consistently 15 to 30 percent over PWM. On a system producing 400 watts at peak, that is 60 to 120 additional watt-hours every sunny day. Over a week of boondocking, the difference between arriving at Friday with adequate battery reserves and arriving depleted can come down to the controller choice made during installation. We install MPPT controllers exclusively on any system above 200 watts. For a 100-watt entry-level maintenance system, a quality PWM is acceptable. For anything designed to sustain real off-grid living, MPPT is not optional.

The AC Question - What Solar Can and Cannot Do

The most common misconception we encounter is the belief that enough solar panels will run an RV air conditioner. The math is unforgiving. A 13,500 BTU rooftop unit draws 1,200 to 1,500 watts continuously while running and surges to 2,800 to 3,500 watts on compressor startup. To sustain four hours of AC runtime per day from solar and battery alone, a coach would need roughly 2,000 to 3,000 watts of roof panels, a 400 to 600 amp-hour lithium battery bank, and a 3,000-watt pure-sine inverter capable of handling the compressor surge. That hardware costs $8,000 to $15,000, weighs several hundred pounds, and requires an amount of roof space most coaches do not have. It is technically possible on a high-roof Class A or a large fifth wheel with a clear roof. It is not practical for the vast majority of travel trailers, Class C coaches, or any coach with roof obstructions.

The realistic role of solar in Florida is as a house-loads system: refrigerator, lighting, fans, electronics, water pump, and similar 12-volt or inverter-driven loads. A 400 to 800 watt system handles this comfortably and makes extended boondocking in Florida state parks - where shore power is often unavailable at primitive sites - genuinely comfortable. For temperature control at a campsite without hookups, a quality generator run for two hours in the morning to pre-cool the coach, combined with a well-insulated rig and reflective window coverings, is still the practical answer. Solar extends your independence; it does not yet replace mechanical cooling for most owners.

Battery Chemistry - Lead-Acid vs Lithium Paired with Solar

Solar and battery storage are inseparable, and the battery chemistry you choose changes the entire system design. Flooded lead-acid and AGM batteries should only be discharged to 50 percent of rated capacity before charging; drawing them deeper damages the plates and shortens life significantly. A 200 amp-hour AGM bank provides 100 usable amp-hours at 12 volts, or 1,200 watt-hours. Lithium iron phosphate (LFP) batteries can be discharged to 20 percent state of charge safely, delivering 80 percent of rated capacity. A 100 amp-hour lithium battery provides 80 usable amp-hours - nearly as much as a 200 amp-hour AGM, at roughly half the weight. Lithium also charges faster, accepting bulk current right up to near full capacity rather than tapering early as lead chemistry does. An MPPT controller pushing 40 amps into a lithium bank at 9 in the morning stays at 40 amps until the battery is 95 percent full. The same controller pushing into an AGM bank starts tapering at 80 percent, recovering the last 20 percent slowly. In Florida where morning sun comes strong and early, this means lithium pairs disproportionately well with solar - you bank energy quickly when it is available.

Roof Mount vs Ground Mount vs Portable - What Works for Florida RVers

Permanent roof-mount is the most popular choice because panels stay connected, require no setup, and harvest energy while you are away from the coach. The trade-off is fixed tilt. Florida's latitude ranges from roughly 24 degrees in the Keys to 30 degrees in the Panhandle. For maximum annual yield, panels should be tilted at an angle approximately equal to latitude. A flat-mounted panel on the roof of a coach sitting at 26 degrees north latitude collects meaningfully less in the low-sun winter months than a tilted ground array would. In summer, flat mounting is close to optimal because the sun is nearly overhead. For the eight-month camping season that defines Florida snowbird use, roof-mount works extremely well. The winter shortfall matters more for full-timers who park in northern Florida in January.

Portable ground-mount panels solve the tilt problem and can be positioned away from shade caused by the coach itself, adjacent trees, or roof obstructions like air conditioners and vents. The cost is setup time and the need to store the panels while traveling. A 200-watt portable folding panel weighs roughly 25 to 35 pounds and can be connected to the coach's existing roof system through a single Anderson connector at the rear. Many serious boondockers run a hybrid: a fixed roof array for baseline collection and a portable unit deployed when the campsite permits. We can wire a dedicated input port for ground panels during any installation, adding the option without requiring a full system replacement later.

What a Florida Thunderstorm Actually Does to Your System

Heavy cloud cover reduces panel output to 5 to 15 percent of rated capacity - a 400-watt system under a thick thunderstorm layer produces 20 to 60 watts. That is not a system failure; it is physics. The real electrical risk is lightning. A direct strike or a strike-induced surge on the panel wiring can destroy an unprotected MPPT controller and damage the battery bank. Quality controllers from Victron Energy include surge-protected PV inputs designed to clamp transient spikes. For any system above 400 watts, we additionally install a DC surge protection device between the panel strings and the controller input. This adds perhaps $60 to $120 to the installation cost and provides meaningful protection against the transient surges that Florida thunderstorms generate regularly from May through September. Disconnecting the panel array connector during a severe electrical storm is good practice when you have advance warning. Leaving the system connected during a normal rain event is perfectly fine and produces no risk beyond the reduced output inherent in low irradiance.

Installation Cost and What Each System Level Delivers

Pricing for RV solar installation varies based on panel count, controller size, battery upgrades, and roof complexity. The ranges below reflect installed costs at the coach, including materials, hardware, waterproof cable routing, and wiring to the battery bank. Battery work is priced separately and depends on whether your existing bank is being retained, supplemented, or replaced. All prices are current Florida-market estimates; national pricing may vary.

Frequently Asked Questions

Sources and Further Reading

The specifications and performance claims on this page are based on manufacturer documentation and real-world installation data collected from Florida RV service across more than a decade of mobile work. The following manufacturer resources provide detailed technical specifications for the equipment we install most frequently.