Do you follow IEC standards for solar thermography?

Yes. We follow IEC TS 62446-3 standards including the >600 W/m² irradiance minimum, module-perpendicular flight orientation, and verified atmospheric conditions.

Can you find sub-module diode failures versus full string outages?

Yes. The thermal signature is different — diode failures show as a third or two-thirds of a module heating, while string outages affect contiguous strings. Our reporting distinguishes between them.

Will you integrate the defect list with our CMMS?

Yes. We deliver geolocated defect data in formats compatible with most utility-scale O&M and CMMS workflows.

Aerial radiometric thermal imaging of a utility-scale solar farm showing hot spot cells, activated bypass diodes, and string failure patterns

Core Service

Solar Panel Thermal Inspection

Maximize solar farm output. Identify defective cells, string failures, and diode issues across utility-scale arrays with IEC-standard drone thermal imaging.

Overview

For utility-scale solar farms, manual I-V curve tracing is too slow to keep up with O&M demand. Holmes and Watson provides rapid aerial thermography following IEC TS 62446-3 standards, detecting cell-level defects, bypass diode failures, and full string outages across thousands of panels in a single mission. O&M teams get a prioritized, geolocated defect list that goes straight into the work-order system.

Why Choose Drone Solar Thermography

Aerial thermography is the only practical way to inspect a utility-scale solar farm comprehensively. A 50 MW site can be fully scanned in a single day; the same coverage by hand would take weeks. The defensible defect data that comes out of the mission goes straight to maintenance work orders, restoring lost power production faster.

When to use it: Use solar thermography annually for O&M, post-installation commissioning, after hail or severe weather events, prior to acquisition or warranty disputes, and when sudden production drops indicate undiagnosed array failures.

What We Inspect

Individual cell hot spots and micro-cracks
Activated bypass diodes and submodule failures
Offline strings and combiner box anomalies
PID (Potential Induced Degradation) patterns
Vegetation shading and soiling issues
Tracker and inverter heat anomalies

Our Process

Standardization

Flights conducted under IEC-compliant irradiance levels (>600 W/m²) with verified module orientation and clear-sky conditions.

Rapid Scanning

Multi-rotor flights with paired radiometric thermal and high-resolution RGB payloads cover full arrays efficiently.

AI-Assisted Analysis

Automated defect detection algorithms classify anomalies by severity and type, then verified by certified thermographers.

Integration

Exporting localized defect coordinates directly to your CMMS or asset management software.

Deliverables

Comprehensive digital twin of the solar asset, categorized anomaly list with GPS coordinates, severity classification, estimated power loss calculations, PDF summary, and CMMS-compatible export.

Cost Factors

Site capacity (MW) and total module count
Site geometry complexity (single-axis tracking, terrain)
Annual program vs. one-off scan (annual programs are significantly cheaper per visit)
Reporting depth and CMMS integration requirements

Frequently Asked Questions

Typically 25-75 MW per day depending on site geometry, module density, and weather conditions. Larger sites are sequenced across multiple days with consistent flight protocols.