Drone Solar Panel Inspection in Canada: How It Works and What It Costs
How drone solar panel inspections work in Canada, from rooftop arrays to solar farms: what thermal finds, the sunshine it needs, the report, rules and prices.
A drone solar panel inspection uses a thermal camera, usually with a regular camera alongside it, to find panels and cells that run hotter than they should. A failed cell, a broken bypass diode and a string that isn’t producing each leave their own heat pattern, so a drone can check thousands of panels in the time a crew on foot checks a few rows. In Canada, the work has a season: it needs strong, steady sunshine on the panels, so most inspections run from spring to early fall. Utility-scale inspections are typically priced at $0.40–$1.00 per panel.
What a Drone Finds
A panel that isn’t converting sunlight into electricity turns more of it into heat, so faults show up warmer than the panels around them. The shape of the warm area says a lot about the cause:
| What the thermal image shows | Likely cause | Usual next step |
|---|---|---|
| One hot cell or spot | A cracked or damaged cell, dirt or shading | Check for dirt and shade, then the panel itself |
| A third of a panel warmer, in a strip | A failed bypass diode or a fault in that section | Test the panel and its diodes |
| A whole panel warmer | The panel is disconnected or not producing | Check its connections |
| A whole row or string warmer | The string is off: a fuse, connector or inverter issue | An electrician checks the string |
| Panels at one end of a string warmer | Possible potential-induced degradation (PID) | Electrical testing to confirm |
| A hot connector or junction box | A loose or failing connection | An electrician checks it soon, as it can be a fire risk |
The regular camera adds what heat doesn’t show: cracked glass, dirt and bird droppings, plants shading the bottom row, snow and ice damage, hail damage and loose racking.
The Conditions It Needs
Faults only show while the panels are producing power, so a solar scan is the one thermal job done in bright sunshine. IEC TS 62446-3, the international standard for thermal inspection of solar plants, calls for:
- Strong sunshine. At least 600 W/m² of sunlight on the panels, measured at the same tilt as the panels.
- A clear sky. Clouds covering no more than 2/8 of the sky. A passing cloud cools panels quickly and can hide or fake a fault.
- Steady conditions. Low wind and dry panels, usually from late morning to mid-afternoon, after the dew has gone.
- A normal day for the plant. The system should be running as usual, not limited by its inverters or switched off for maintenance.
The standard also asks for the conditions to be recorded during the flight: sunlight, air temperature and wind. It describes two levels of inspection, simplified and detailed, so agree which one you’re buying. Good pilots also fly at an angle that keeps the sun’s reflection off the panels, since a reflection can look like a hot spot.
Timing It Around the Canadian Seasons
- Spring to early fall is the main season. Long days and a high sun give more hours with enough sunlight on the panels.
- Winter is a poor choice for a full inspection. Snow covers the panels, days are short and batteries drain fast in the cold, even if a clear day can bring enough sun on tilted panels.
- After hail or a big storm, a quick inspection documents damage for the insurer and the installer. Hail season on the Prairies runs through the summer.
- At handover and before warranties end. An inspection when a system is new gives a baseline to compare against. Another before a warranty ends finds faults while the manufacturer still covers them.
Rooftop Arrays and Solar Farms
Rooftop Solar
On homes and commercial buildings, a drone checks the panels without anyone walking on the roof. It’s often booked together with a roof inspection. In towns, neighbours and passers-by are close, so a residential job usually calls for a pilot with an Advanced certificate.
Solar Farms
On a solar farm, the drone flies a programmed grid over the rows at a set height, so every panel is covered with enough detail to see individual cells. The images are then processed to find, classify and locate every fault. A good report places each one on a map of the site, by block, row and panel.
Big sites can take more than one day. Flying beyond the pilot’s sight needs the Level 1 Complex certification introduced on November 4, 2025, or a special flight operations certificate (see what changed on November 4), so most sites are flown in blocks within sight of the pilot.
What the Report Should Include
- A list of every fault, with its location by block, row and panel, ideally also as GPS coordinates
- A thermal image and a regular photo of each fault
- The type and severity of each fault, with a suggested next step
- A map of the site, often an orthomosaic photo map with the faults marked
- The flight conditions: sunlight, air temperature, wind and time
- The raw radiometric images, if you want to analyze them yourself or compare next year
Ask for a sample report before you hire. For farms, ask whether the fault list can be imported into your maintenance system.
The Rules
The pilot is responsible for flying legally, but knowing the basics helps you hire the right person.
- Certificate. Anyone flying a drone between 250 g and 25 kg needs a Transport Canada pilot certificate. Basic operations stay in uncontrolled airspace and at least 30 metres horizontally from anyone not involved. Closer to people, or in controlled airspace, the pilot needs an Advanced certificate.
- Airspace. Many solar farms are rural and in uncontrolled airspace, but some sit near airports or under controlled airspace, which also needs an RPAS flight authorization from NAV CANADA. Check the site on our free Airspace Explorer map.
- Site safety. A solar farm is an electrical facility. Expect the pilot to follow the site’s safety rules, check in with the operator and keep clear of live equipment.
What a Drone Solar Inspection Costs
These ranges come from our guide to what it costs to hire a drone pilot in Canada:
| Job | Typical price (CAD) | Usually includes |
|---|---|---|
| Solar farm (utility scale) | $0.40–$1.00 per panel | Thermal scan and a per-panel report |
| Commercial roof (single building) | $500–$1,500 | Photos, thermal scan and a report |
Rooftop arrays on homes are usually quoted per job, often together with a roof inspection. Analysis by a thermography specialist often adds 15–30%, and annual inspections are often priced as a contract at a lower rate per visit. These are a starting point for budgeting, not a quote.
Questions to Ask Before You Hire
- Is your thermal camera radiometric, and how much detail will you capture per panel?
- Do you follow IEC TS 62446-3, and will you record the sunlight, temperature and wind during the flight?
- Can I see a sample report? Will it locate each fault by row and panel?
- Who analyzes the images: you, a specialist or software?
- Which certificate do you hold, is the site in controlled airspace, and are you insured?
- Can you repeat the inspection next year so we can compare?
Our hiring checklist covers the rest, from drone registration to who owns the data.
Find a Pilot on the RPAS WILCO Marketplace
The RPAS WILCO Marketplace lists drone pilots and drone service companies across Canada. Filter by solar inspection, or by the energy and solar industry, then narrow by province. Each profile shows the pilot’s experience and their specialties, such as rooftop arrays, utility-scale farms, panel-level reporting and soiling assessment.
Pilots on the Marketplace are independent, so check their certificate and insurance yourself. RPAS WILCO doesn’t add booking fees or take a commission, so the price you agree is the price you pay.
Frequently Asked Questions
How much does a drone solar panel inspection cost in Canada?
Utility-scale solar farms are typically $0.40–$1.00 per panel for a thermal scan and a per-panel report. Rooftop arrays are usually quoted per job, often together with a roof inspection.
When is the best time to inspect solar panels with a drone?
Late morning to mid-afternoon on a clear, calm day, when the panels are producing power. The international standard calls for at least 600 W/m² of sunlight on the panels. In Canada, that makes spring to early fall the main season.
What does a thermal drone find on solar panels?
Hot cells, failed bypass diodes, panels and strings that aren’t producing, possible potential-induced degradation and hot connections. The regular camera adds cracked glass, dirt, shading, and storm and hail damage.
Can a drone inspect solar panels in winter?
Rarely well. Snow covers the panels, days are short and the cold drains batteries. A clear winter day can bring enough sun on tilted panels, but a full inspection is better planned for spring to early fall.
Do I still need an electrician after a drone inspection?
Yes. The drone finds and locates the faults. An electrician or the plant’s maintenance team confirms them with electrical tests and makes the repairs.