Multirotor Configuration for Solar PV Inspection

Overview

• Fix altitude, gimbal angle and route so that string and row boundaries land in the same place in every frame.
• Thermal screening finds hot spots; visible imagery resolves what they physically are. Run both.
• Agree the module addressing scheme (row/string/index) before the first flight, or the defect list will not map to the array.
• Track results against a fixed epoch — comparing an August flight to a February flight will confuse irradiance with degradation.

Why PV inspection is a different problem

A photovoltaic array is a large, repetitive, thermally active surface. The anomaly you are looking for — a hot cell, a failed string, a diode fault — is small relative to the area and only visible under the right irradiance and load conditions. That makes PV inspection a survey design problem before it is an aircraft problem.

The two decisions that matter are irradiance window and ground sample distance. Fly too early or under cloud and the thermal contrast collapses; fly with too coarse a resolution and a single hot cell disappears into a pixel. Both are planning decisions, and neither can be fixed afterwards in the imagery.

Planning the pass

Define the irradiance and load window first, then work out how much area can be covered inside it at the required ground sample distance. That arithmetic sets the aircraft: a platform with enough endurance to finish the block inside the window, at a speed that keeps the resolution, with overlap sufficient for stitching without gaps.

Repeatability matters because PV inspection is almost always comparative — this quarter against last quarter. Fix the altitude, speed, overlap and time window, then hold them. A change in any one of them makes the two surveys describe different things, and the trend becomes meaningless.

Sensor and platform notes

Thermal is the primary sensor for electrical faults; visible imagery is what locates the finding on a specific panel and row. Capturing both in one pass is what makes the output actionable — the thermal frame flags it, the visible frame identifies it.

Where the array is large and the window is short, coverage per sortie becomes the constraint rather than payload. That is the point at which a fixed-wing configuration is worth evaluating against a multirotor; see VTOL versus multirotor for how that comparison is made. For smaller arrays and repeat visits, M-15 covers the paired-payload case.

What the output has to contain

A PV inspection deliverable should let a maintainer walk to the right panel. That means each thermal finding is located against a row and panel identifier, with the capture conditions recorded: irradiance, time, ambient temperature, and the array's operating state where it is available.

Automated detection is a candidate list for review, not a verdict. Thermal anomalies include reflections, soiling and edge effects that are not faults. Place the review step where the reviewer has both frames and the conditions, and the list becomes useful instead of noisy.

Related pages

• M-30 heavy-payload long-endurance multirotorView
• M-15 with thermal imaging optionView
• M-10 compact inspection platformView
• Intelligent Payloads and AccessoriesView

More in this area

• How to Choose an Industrial Multirotor PlatformRead
• Multirotor Configuration for Power Facility InspectionRead
• Multirotor Configuration for Solar PV InspectionThis page
• Multirotor Configuration for Building Facade InspectionRead
• Multirotor Configuration for Bridge InspectionRead
• Thermal Imaging Payload Configuration for InspectionRead
• Emergency Lighting and Speaker Payload ConfigurationRead
• Multi-Payload Platform ConfigurationRead
• Endurance and Payload Trade-offs for MultirotorsRead
• Multirotor Customization Requirement ChecklistRead