Drone Solar Panel Inspection Services India
Lesoko’s drone solar panel inspection service uses UAV-mounted radiometric thermal sensors to detect hotspots, PID degradation, bypass diode failures, and micro-cracks that manual walkthroughs routinely miss delivering geo-tagged, IEC 62446-3 compliant reports within 24 hours, with zero production downtime.
5+ lakh
Drone Flights Completed
34+ GW
Solar Assets Inspected
2.3+ lakh
Hectares Surveyed
210+ Cr
Saved in Operational Costs
13,000+
Rooftop Surveys Completed
What Is Drone Solar Panel Inspection?
Drone solar panel inspection uses UAV-mounted radiometric thermal sensors to scan photovoltaic arrays systematically from above, identifying temperature anomalies that indicate module-level defects. Licensed pilots fly calibrated grid patterns over each panel row, capturing both thermal and visible-light imagery simultaneously. The processed data is delivered as geo-tagged defect maps and IEC 62446-3 compliant reports without any plant shutdown.
Manual walkthroughs identify surface damage only. I-V curve tracing finds electrical faults but requires partial system shutdown and significant field time at scale. Aerial thermography covers utility-scale assets in a fraction of the time, detecting hidden defects that both traditional methods routinely miss.
Problem Statement
The Inspection Gap Most O&M Teams Underestimate
Manual inspection works for post-storm visual assessment. It does not work for detecting early-stage hotspots, PID degradation patterns, or bypass diode faults across thousands of modules. Scheduled aerial thermography enables preventive maintenance identifying defects before they compound rather than reactive response after SCADA alerts have already signalled production loss.
String-level underperformance that suppresses performance ratio (PR) is rarely captured by SCADA until the cumulative loss becomes operationally significant. Field inspection at utility scale also carries real safety exposure. Rooftop access requires fall protection and permit-to-work processes. Ground-level checks across hundreds of rows are operationally impractical.
Unresolved bypass diode failures cause progressive yield loss that compounds over months before SCADA reporting triggers action. Without module-level geo-tagged documentation, lender audits and manufacturer warranty claims lack the evidence base they require.
Radiometric vs Non-Radiometric
Radiometric sensors record absolute temperature values per pixel enabling accurate defect classification by temperature differential. Non-radiometric thermal cameras only show relative heat patterns and cannot produce IEC 62446-3 compliant output. The distinction determines whether an inspection report is acceptable to lenders, insurers, and independent technical auditors.
Process
How the inspection process works
Six operational steps from pre-flight planning to report delivery with every stage designed for zero production downtime.
Pre-flight Planning
Site assessment, systematic flight path design, airspace clearance filing for restricted zones. Thermal and visible sensor calibration confirmed before departure.
Site Risk Assessment
DGCA-compliant safety protocols, insurance verification, plant access coordination with on-site security and operations teams.
Flight Execution
Licensed pilot operates drone under IEC 62446-3 compliant irradiance conditions (600+ W/m²). Operations are paused if wind speed exceeds 8 m/s or irradiance drops below threshold.
Thermal + Visual Capture
Radiometric TIFF maps, high-resolution orthomosaics, GPS-accurate geo-tagging at module level. Ground sampling distance (GSD) calibrated per site for sub-5 cm/pixel resolution.
Defect Analysis
Engineer-led thermal anomaly detection and classification. Visible-light imagery overlaid on thermal data to eliminate false positives from soiling before the defect register is finalised.
Report Delivery
Engineer-verified output delivered within 24 hours of flight completion. Includes geo-tagged defect maps, maintenance prioritisation sheets, and executive inspection dashboard.
Defects Detected by Aerial Thermography
Radiometric thermal sensors identify nine distinct fault categories. All cause measurable production loss or safety risk, and none are visible to the naked eye.
hotspots
Cell-level temperature spikes from mismatch, micro-cracks, or partial soiling. Elevate fire risk and degrade string output progressively if unresolved.
Multiple hotspots
Two or more simultaneous hotspot zones within a single module, indicating advanced cell degradation, sustained mismatch, or internal wiring faults.
String Reverse Polarity
DC string connections reversed at the combiner box current flows backwards, opposing the array and dissipating the full string’s power as heat.
Open Circuit
Complete break in the electrical path and no current flows, no heat generated. The affected module or string produces zero output entirely.
Shadow
Objects or structures casting shadows on modules, significantly reducing panel efficiency and causing reverse-bias stress on shaded cells.
Damage
Glass breakage, cell cracks, or frame damage compromising module integrity, increasing arc-fault risk, and reducing generation capacity.
Dust & Soiling
Dust and particulate accumulation reducing irradiance absorption. The #1 efficiency loss factor in India’s dry climate, causing 10–30% output drops.
Vegetation Overgrowth
Plant overgrowth around or under installations causing persistent shading, structural stress, and fire risk in ground-mount systems.
Bird Droppings
Contamination from bird droppings causing partial shading and localised hotspots, accelerating cell-level degradation over time.
Key Benefits
Why Solar Asset Owners Choose Aerial Thermography
Module-level thermal anomaly detection
Covers hotspots, PID, bypass diode failures, and micro-cracks. Defect types invisible to visual inspection and undetectable by non-radiometric cameras.
Zero production downtime
Full plant operation continues throughout the thermal survey. Panels remain energised. A technical requirement for reliable defect detection.
Preventive, not reactive, maintenance
Scheduled aerial surveys identify defects before they compound. Enabling targeted repair before SCADA alerts signal production loss that has already accumulated for months.
Engineer-verified 24-hour reporting
Industry standard turnaround is 3–7 days. Lesoko delivers geo-tagged defect maps, maintenance prioritisation sheets, and executive dashboard within 24 hours of flight completion.
Module-level GPS coordinates
Every identified anomaly is geo-tagged with exact GPS coordinates. Enabling maintenance teams to locate and address defects without re-inspection.
DGCA-compliant — full liability insurance
Every pilot holds individual DGCA commercial certification. Third-party liability insurance included on every project without exception.
Lender-grade documentation
Inspection reports are formatted for direct use in technical due diligence including geo-tagged defect evidence and IEC 62446-3 documentation accepted by lenders and insurance underwriters.
Radiometric thermal data — IEC 62446-3 compliant
Temperature-accurate radiometric output (not visual-only imagery) meeting the sensor and documentation standard for lender audit, warranty claims, and insurance verification.
Technical Methodology
Inspection Methodology
Inspections are scheduled during peak irradiance windows 600+ W/m² is the minimum threshold for reliable defect detection. Thermal sensors undergo radiometric calibration before each session; ambient temperature, wind speed, and humidity are logged throughout the flight.
Ground sampling distance (GSD) is calibrated per site flight altitude is adjusted to achieve sub-5 cm/pixel resolution at module level, enabling individual cell defect identification rather than row-level anomaly detection only. Flight operations are suspended when wind speed exceeds 8 m/s beyond this threshold, radiometric sensor accuracy and UAV flight stability are both compromised.
Post-flight, thermal and visible-light imagery is processed into georeferenced orthomosaics using photogrammetry software. Defect classification follows IEC 62446-3 severity tiers. Engineer-led thermal anomaly detection eliminates false positives before the defect register is finalised. Every anomaly is reviewed by a qualified engineer before entering the final report.
Drone-Based Solar Rooftop Survey Solutions
Lesoko’s drone-powered survey process captures, processes, and delivers engineer-grade data for every rooftop solar project from a single 500 sqm commercial terrace to a 10-acre industrial complex.
Soiling False Positives
Soiling deposits and dust accumulation on solar panels produce localised heat signatures that closely resemble early-stage hotspot defects in thermal imagery. Unfiltered thermal data can overstate the number of genuine defects. Experienced inspection engineers overlay visible-light imagery over thermal data as a standard quality step, eliminating soiling-induced false positives before the defect report is issued.
Tracker Tilt & Single-Axis Systems
Single-axis tracker panels require inspection at fixed tilt angles during peak irradiance. Free-moving trackers during flight produce inconsistent thermal readings that can conceal genuine anomalies. Tracker position is coordinated with plant operations before flight scheduling on all tracker-equipped sites.
Sun Angle & Irradiance Timing
Radiometric data quality degrades when sun angle is below 30° from horizontal. Inspection flights are scheduled around peak irradiance windows typically mid-morning to early afternoon to ensure thermally accurate module-level capture. Early-morning or late-afternoon flights at non-arid sites carry elevated false-negative risk.
Inverter Mismatch Overlap
Inverter mismatch signatures can overlap with electrical fault thermal patterns. Defect classification by engineers, rather than automated software alone, is required to distinguish these accurately. All Lesoko reports include engineer-reviewed classification before final defect register issuance.
Audience
Who this service is for
Solar O&M Managers
Asset Performance & Maintenance Teams
- Responsible for asset health, maintenance scheduling, and yield optimisation across operational sites
- Manual inspection creates coverage gaps and documentation weaknesses at utility scale
- Geo-tagged defect reports integrate directly into existing maintenance workflow systems
- Preventive defect resolution before cumulative yield loss triggers SCADA alerts
EPC Heads — Renewable Energy
Commissioning & Handover Documentation
EPC heads require module-level documentation for commissioning sign-off, lender acceptance, and warranty validation before handover. Radiometric TIFF and orthomosaic outputs meet standard EPC handover documentation requirements across major lenders and independent engineers. Inspection reports formatted for lender technical due diligence including geo-tagged defect evidence and IEC 62446-3 documentation. Reduce handover risk and accelerate sign-off. Faster report turnaround supports tight commissioning and handover timelines where delays carry penalty clauses.
Utility Procurement — IPPs, DISCOMs
Multi-Site Portfolio Management
- Consistent vendor quality and consolidated reporting across multi-state portfolios
- Standardised deliverables across all assets and same report format for every site regardless of state
- Single-vendor structure reduces procurement overhead for multi-state inspection programmes
- Portfolio inspection scheduling coordinated across sites to optimise mobilisation and minimise per-MW cost
Service Coverage — Across India
Lesoko operates with deployment capability within 48 hours for sites above 10 MW. Completed inspection projects span Tamil Nadu, Karnataka, Gujarat, Rajasthan, Maharashtra, Andhra Pradesh, and Telangana. Same-day deployment is available in Chennai, Bengaluru, and Hyderabad for urgent inspection requirements.
Covered solar parks include Charanka (Gujarat), Bhadla (Rajasthan), Pavagada (Karnataka), Kurnool Ultra Mega Solar Park (Andhra Pradesh), and Kamuthi Solar Power Project (Tamil Nadu).
Regional Site Conditions
Dust accumulation patterns vary significantly between arid sites such as Rajasthan and Gujarat and coastal installations such as Tamil Nadu. Arid sites generate higher soiling false-positive rates; coastal sites carry elevated corrosion risk at junction boxes. Inspection protocols are adjusted per region to account for these operational differences.
Monsoon Season Restrictions
Drone operations across peninsular India are restricted from June to September due to monsoon-season wind and rainfall. Pre-monsoon (March–May) and post-monsoon (October–November) windows deliver the most operationally useful inspection data. Portfolio operators should schedule inspections during these windows to avoid seasonal flight restriction delays.
- Gujarat
- Rajasthan
- Tamil Nadu
- Karnataka
- Maharashtra
- Andhra Pradesh
- Telangana
- Madhya Pradesh
- Uttar Pradesh
- Odisha
- Punjab
- Haryana
- Himachal Pradesh
- Uttarakhand
- Bihar
- Jharkhand
- Chhattisgarh
- West Bengal
- Kerala
- Assam
- Jammu & Kashmir
Request an Inspection Proposal for Your Solar Assets
No upfront commitment required. Proposals are site-specific. Provide MW capacity, location, and report requirements to receive an accurate quote within 24 hours.
Pricing
Inspection cost and pricing structure
Drone solar panel inspection pricing is project-specific. No two sites share identical requirements. Larger sites benefit from lower per-MW cost due to deployment efficiency — and multi-site portfolios within a region can reduce costs further.
Sites within the same state or region can be bundled into a single mobilisation reducing per-MW cost considerably across the portfolio. Inspection spend is typically a small fraction of the operational savings enabled by early defect detection. ₹210 Cr+ in operational savings has been enabled across Lesoko’s inspection portfolio measured by early defect resolution against estimated revenue loss from unresolved production anomalies. Inspection reports are formatted for direct use in lender technical due diligence, reducing documentation overhead for EPC and IPP procurement teams.
Pricing variables that determine inspection scope and cost
- MW Capacity: Larger sites benefit from lower per-MW cost due to deployment efficiency
- Terrain & Access: Remote or hilly terrain increases logistics and mobilisation overhead
- Report Depth: Standard defect list vs full radiometric TIFF + orthomosaic + geo-tagged dataset
- Travel Requirements: Remote sites in Rajasthan and Gujarat require multi-day deployments
- Turnaround Timeline: Standard vs expedited report delivery
- Portfolio Bundling: Sites within the same state can be bundled into a single mobilisation, reducing per-MW cost
Measurable Impact.
A 600KW rooftop solar power plant was inspected after reporting a steady drop in output. Regular dust accumulation was the primary suspected cause. Lesoko's drone flew for just 1.5 hours and delivered cell-level defect mapping across all 1,430 modules — enabling the O&M team to take same-day action.
Outcomes Achieved
Defect Breakdown — % of 600KW
Solar Panel Inspections Video Coverage
Our Amazing Clients
What Solar Plant Operators Say
Deliverables
What Every Inspection Includes
Radiometric TIFF Maps
Temperature-accurate thermal data at module level. Suitable for reanalysis, warranty documentation, and lender audit.
High-Resolution Orthomosaics
cm/pixel accuracy, GIS and CAD compatible. Full-array georeferenced imagery for structural and layout analysis.
Geo-Tagged Defect Reports
Module-level GPS coordinates for every identified anomaly. Maintenance teams can locate defects without re-inspection.
Maintenance Prioritisation Sheets
Repair schedules ranked by IEC 62446-3 defect severity. Enabling resource allocation before field teams are deployed.
Thermal Anomaly Maps
Visual hotspot overlays across the full array. Executive-level summary of defect distribution and severity.
Inspection Summary Dashboard
Executive KPI overview for asset management teams defect count, severity breakdown, repair priority summary.
Get Free Quote in 24 Hours
Phone/ Whatsapp
+91 78457 26375/ 7845726374
Email Us
sales@lesoko.in
Head Office
Get Your Inspection Quote
Frequently Asked Questions
Drone thermal inspection detects hotspots, PID (Potential Induced Degradation), micro-cracks, bypass diode failures, string-level mismatch, soiling anomalies, and junction box overheating. These defects cause substantial power loss and in some cases present fire risk. Radiometric sensors detect temperature differences invisible to the naked eye — identifying significantly more fault types than manual visual inspection or non-radiometric cameras.
Pricing is determined by MW capacity, terrain complexity, travel requirements, report depth, and turnaround timeline. Utility-scale farms above 50 MW benefit from lower per-MW rates due to deployment efficiency. Sites within the same state or region can be bundled into a single mobilisation, reducing per-MW cost across the portfolio. Inspection cost is a small fraction of operational savings enabled by early defect detection.
Annual aerial thermography is the minimum recommended frequency for utility-scale assets. High-capacity farms above 100 MW benefit from bi-annual surveys. Post-storm and post-hail inspections are triggered by events regardless of the scheduled cycle. Early detection prevents compounding yield loss and strengthens lender audit documentation. Read our inspection frequency guide for asset-type specifics.
Reliable solar panel inspection requires radiometric thermal sensors at 640×512 resolution minimum not visual-only cameras, which cannot detect hidden electrical anomalies. Radiometric sensors record absolute temperature values per pixel, enabling accurate defect classification by temperature differential. Non-radiometric thermal cameras only show relative heat patterns and cannot produce IEC 62446-3 compliant output. RTK GPS integration provides cm-level geo-tagging accuracy. Inspections must be conducted at 600+ W/m² solar irradiance so that thermal defect signatures are distinguishable from ambient variation.
Yes. Every inspection is conducted by Lesoko’s own DGCA-licensed pilots under Civil Aviation Requirements for commercial drone operations. All pilots hold individual DGCA commercial certifications issued through RPTO-accredited training not company-level proxies. We do not subcontract to third-party operators. Full third-party liability insurance is included on every project. Pilot licence documentation and insurance certificates are available for review prior to contract sign-off.
No. Aerial thermography operates while panels remain fully energised and under load. Accurate thermal defect detection requires active generation — it is a technical requirement, not a constraint. Panels must be energised because hotspots, bypass diode failures, and PID signatures produce detectable heat anomalies only when the module is under electrical load. A de-energised panel produces no thermal differential, making defect detection technically impossible. This eliminates the revenue loss associated with partial or full shutdowns required by some traditional inspection methods.
PDF defect reports, radiometric TIFF thermal datasets, high-resolution orthomosaics (JPEG/PNG), KML geo-data, and Excel defect sheets. All formats are compatible with major GIS platforms, CAD software, and common asset management systems. Raw radiometric files are provided for future reanalysis and warranty documentation purposes.
Deployment within 48 hours for sites above 10 MW across India. Same-day deployment is available in Chennai, Bengaluru, and Hyderabad for urgent requirements. Restricted-airspace sites near airports or defence installations require a minimum 10-day lead time to complete DGCA permission filing. Remote sites in Rajasthan or Gujarat require multi-day logistical planning — factor this into project timelines.
IEC 62446-3 is the international standard governing thermographic inspection of photovoltaic systems. It defines minimum irradiance thresholds (600+ W/m²), maximum acceptable wind speed and cloud cover, and required documentation for inspection reports. Reports produced under IEC 62446-3 protocols are recognised by lenders, insurance underwriters, and independent technical auditors for due diligence and warranty claim purposes. Non-compliant reports — regardless of image quality — may be rejected in lender audit processes.
Procurement teams evaluating vendors for lender-audit-grade inspections should require a sample report before contract sign-off to verify compliance with these documentation standards.
Lender technical auditors assess inspection reports against IEC 62446-3 documentation requirements. Checking for geo-tagged module-level defect coordinates, irradiance logging, severity classification, and evidence of radiometric (not visual-only) data capture. Reports that lack these elements are routinely rejected during financial due diligence.
Lesoko’s reports are structured to meet these requirements directly: each report includes geo-tagged module-level defect coordinates, logged irradiance data confirming 600+ W/m² conditions, IEC 62446-3 defect severity classification, and confirmation of radiometric sensor use. Procurement teams evaluating vendors for lender-audit-grade inspections should request a sample report before contract sign-off to verify compliance with these documentation standards before committing to a vendor.