Do Florida Solar Panels Need Cleaning? An Evidence Checklist

Make a condition record without going onto the roof

From an ordinary safe ground-level position, note where residue is visible and when you first noticed it. Distinguish an isolated deposit from a band along several panel edges or a broad film across a roof plane. Save a dated overview and, only if available without climbing or reaching, a closer photograph. Use location labels such as garage-facing array rather than guessing equipment numbers.

Write down recent nearby construction, tree activity or a known debris event as observations, not established causes. If nothing is visible from a safe position, say “not observed.” Missing visual evidence is a reason to request an appropriate inspection, not a reason to climb onto a roof.

Use the rain research within its actual limits

Researchers studying five utility-scale plants in North Carolina found that rain did not fully restore performance affected by pollen. That finding challenges the assumption that frequent rainfall always cleans an array. It does not establish how much a particular Florida home loses or how often its panels should be washed. [1]

For a Tampa, Orlando or Sarasota property, the useful question is what remains on this array and whether the available data supports further investigation. Avoid taking a percentage from a study and multiplying it by your electricity bill. A bill includes household consumption and tariff effects; it is not a direct measurement of dirt on panels.

Check the comparison before blaming soiling

Export daily production with dates and units. Mark missing reporting periods, inverter alerts, shading changes and any documented shutdown. DOE describes measured-versus-expected output comparisons that account for weather and system conditions. [2] Two screenshots taken on different days are not a controlled experiment.

Create a simple table with date range, recorded energy, missing-data notes, weather context and visible condition. Keep blanks as blanks rather than entering zero. A reviewer can then decide whether the data is usable, whether weather normalization is needed, or whether communications and equipment diagnostics should come first. This preparation reduces ambiguity without attempting to diagnose the array yourself.

Ask for a defined cleaning scope

Before approving work, ask the provider to identify the installed module model and applicable cleaning instructions, the roof-access method, the surfaces included and any conditions that would stop the visit. Ask how roof materials, nearby equipment and drainage will be protected. Do not prescribe chemicals, pressure or tools from a generic internet guide; require a method suitable for the actual equipment and roof.

Separate cleaning from fault finding, wildlife work, roof repairs and electrical repairs in the written offer. Identify who documents unexpected damage and who must approve added work. For leased or third-party-owned equipment, confirm the equipment owner’s service requirements before authorizing access.

Hypothetical example: a higher reading does not isolate the cause

Suppose an app records 900 kWh in one month and 1,050 kWh in the month after cleaning. The difference is 150 kWh, or about 16.7% of the first month. That arithmetic is correct, but attributing the whole increase to cleaning is not justified. Different sunshine, month length, outages and reporting completeness may explain some or all of the change.

Keep the cleaning date, condition photos and method with both exports. Ask the reviewer what comparison would help separate those influences. If a provider offers a predicted benefit, request the baseline, period, method and uncertainty behind it rather than accepting a guaranteed return from a single before-and-after pair.

Close the service request with an answerable question

Send the service address privately, equipment information you already have, dated photographs, production exports and the question you need answered: “Is cleaning indicated, and what further evidence would change that conclusion?” Ask for the finding, completed scope, exclusions and follow-up trigger in writing.

If production remains abnormal, retain the record for the next diagnostic step instead of repeatedly ordering cleaning. Origin confirms address-level coverage, supported equipment and the separate work scope. Annual inspection membership is a different decision from purchasing a cleaning visit; review its current inclusions and exclusions before enrolling.

Primary sources

1. National Laboratory of the Rockies: NREL Research Finds Rain Not Enough To Wash Pollen From Solar Panels

   Reviewed October 15, 2026. The 2023 study describes five North Carolina utility-scale plants, not Florida residential cleaning results.

2. U.S. Department of Energy: Optimizing Solar Photovoltaic Performance for Longevity

   Reviewed October 15, 2026. Performance comparisons require appropriate conditions and records; federal-fleet findings are not a promised result for a home.

Planning examples and questions are Origin’s editorial guidance, not a property-specific diagnosis, engineering design, tax determination or promise of savings. Manufacturer and utility references do not imply an affiliation with Origin.

Related guidance

• Request existing-system service
• Review annual inspection membership
• Browse existing-system questions
• Compare production patterns before diagnosing a loss