Utility-Scale Drone Solar Inspection Services in India
Radiometric thermal + RGB aerial mapping identifies hotspots, PID, bypass diode failures, and micro-cracks manual site walkthroughs miss. Track every localized anomaly straight to a live digital twin dashboard under active load conditions. Fully DGCA-certified, IEC 62446-3 compliant. Zero shutdown required.
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
Drone Solar Panel Inspection
What manual inspection and SCADA both miss
Manual walkthroughs miss early-stage faults
Ground inspection works for post-storm visual assessment, while SCADA only tracks string-level output drops. Neither catches early-stage hotspots, PID, or bypass diode faults across thousands of modules. The defects that compound quietly for months before anyone notices.
SCADA reports loss after it happens
String-level underperformance rarely shows up in SCADA until the cumulative yield loss is already operationally significant. By the time an alert fires, the revenue is already gone.
Field access carries real safety exposure
Field access at height and around live strings requires fall protection and permit-to-work processes most O&M teams would rather not run routinely. Without module-level, geo-tagged documentation, lender audits and warranty claims also lack the evidence base they require.
How the inspection process works
Pre-Flight Planning
Survey date confirmed with the site representative, DGCA no-fly zone check, weather-window verification, and flight-path design against the array layout.
Site risk assessment
On-site toolbox talk with client personnel, blocks/trackers requiring inspection re-confirmed, obstacle survey (altitude raised 15 m above any obstruction).
Flight execution
Licensed pilot flies under IEC 62446-3 irradiance conditions (600+ W/m², or panel temperature above 30°C), parallel to panel rows with 10 m overlap between KML boundaries.
Thermal + Visual Capture
RGB mapping at 80% front / 70% side overlap. Thermal mapping at the same overlap ratios, altitude set by roof or array height. Both datasets geo-tagged at module level.
Defect Analysis
Engineer-led thermal anomaly detection and IEC 62446-3 severity classification. Visible-light imagery is overlaid on thermal data to eliminate soiling-driven false positives before the register is finalized.
Defect report delivery
Engineer-verified output typically within 24-48 hours of flight completion, scaled to site size: geo-tagged defect maps, maintenance prioritization sheets, executive dashboard, and live access to Lesoko's defect-tracking platform.
Defects detected by aerial thermography
Radiometric thermal sensors identify twelve distinct fault categories across Lesoko’s inspection history. Every one causes measurable production loss or safety risk, and none are visible to the naked eye until they have already compounded.
Hotspot
Damage
String Reverse Polarity
Open Circuit
Shadow & Shading
Multiple Hotspots
Dust & Soiling
PID / Patchwork & Water Ingress
Bird Droppings
Bypass Diode Failure
Vegetation Overgrowth
Module Hotspot
Why solar asset owners choose aerial thermography
Lender-grade documentation
Geo-tagged defect evidence and IEC 62446-3 aligned documentation formatted for direct use in technical due diligence.
Module-level GPS tagging
Every anomaly geo-tagged with exact coordinates so maintenance teams locate defects without re-inspection.
Live defect dashboard
Track every defect from detection through resolution not a one-time PDF that goes stale the day it's opened.
Preventive, not reactive
Scheduled surveys catch defects before they compound, well ahead of the SCADA alert that signals loss already accrued.
Zero production downtime
Panels stay energized throughout the survey. A technical requirement for accurate defect detection, not a constraint.
Proven operational ROI
₹210+ Cr in operational savings enabled across Lesoko's inspection portfolio, measured against revenue lost to unresolved anomalies.
Radiometric standards
Temperature-accurate data (not visual-only imagery) meeting the sensor and documentation standard lenders require.
Fast, engineer-verified reports
Industry-standard turnaround is 3-7 days. Lesoko delivers within 24-48 hours of flight completion, depending on site scale.
Radiometric vs non-radiometric thermal sensing
Radiometric sensors record an absolute temperature value per pixel, enabling defect classification by exact temperature differential. Lesoko deploys 640×512 resolution sensors with 0.05°C thermal sensitivity, capturing heat anomalies invisible to standard cameras.
Non-radiometric thermal cameras only show relative heat patterns and cannot produce IEC 62446-3 aligned output — the distinction that decides whether a report is acceptable to a lender, insurer, or independent technical auditor.
Where a deeper root-cause diagnosis is needed on flagged modules for example, a recurring hotspot with no obvious external cause Lesoko coordinates ground-level electroluminescence (EL) imaging or I-V curve testing as a complementary follow-up step, since these methods require de-energized or low-light conditions that a flight cannot replicate.
What affects thermal data quality on the ground
Soiling False Positives
Soiling deposits closely resemble early-stage hotspot defects in thermal imagery. Engineers overlay visible-light imagery over thermal data to eliminate 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. 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.
Inverter Mismatch Overlap
Inverter mismatch signatures can overlap with electrical fault thermal patterns. Every report includes engineer-reviewed classification before final defect register issuance to distinguish these accurately.
Built for the people who answer for plant performance
Solar O&M Managers
- Responsible for asset health, maintenance scheduling and yield yield optimization across operational sites
- Manual inspection leaves coverage gaps and documentation weaknesses at utility scale
- Geo-tagged defect reports and the live dashboard slot into existing maintenance workflows
- Preventive defect resolution before cumulative yield loss triggers a SCADA alert
EPC Heads (Renewable Energy)
- Module-level documentation for commissioning sign-off, lender acceptance and warranty validation
- Radiometric TIFF and orthomosaic outputs meet standard EPC handover requirements
- Reports formatted for lender technical due diligence, including IEC 62446-3 documentation
- 24-hour turnaround supports tight commissioning timelines where delays carry penalty clauses
IPPs & DISCOMs
- Consistent vendor quality and consolidated reporting across multi-state portfolios
- Standardized deliverables across all assets: same report format for every site regardless of state
- Single-vendor structure reduces procurement overhead across a multi-site program
- Portfolio scheduling coordinated to optimize mobilizationf and per-MW cost
Compliance, Safety & Data Governance
Every inspection runs under DGCA drone regulations, registered aircraft, certified Remote Pilots, and cleared flight permissions for the site’s airspace category. An on-site safety toolbox talk with client personnel precedes every flight, covering wind conditions, bird activity, and any site-specific hazards before the drone leaves the ground.
Defect classification methodology follows IEC TS 62446-3:2017 — the technical specification covering outdoor infrared thermography for photovoltaic modules and plants. so the severity bands in your report map to a recognized reference point rather than an internal-only scale. Site data and imagery are handled under confidentiality terms, with NDA coverage available on request.
Service Coverage Across India
Lesoko deploys 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.
Arid vs coastal sites
Dust accumulation patterns differ sharply between arid sites (Rajasthan, Gujarat) and coastal installations (Tamil Nadu, Kerala). Arid sites see higher soiling false-positive rates; coastal and floating sites carry elevated junction-box corrosion and bird-drop risk. Inspection protocols are adjusted per region.
Monsoon season restrictions
Drone operations across peninsular India are restricted June–September due to monsoon wind and rainfall. Pre-monsoon (March–May) and post-monsoon (October–November) windows deliver the most operationally useful data.
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.
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 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. Economies of scale apply above 10 MW.
- Terrain & Access: Remote or hilly terrain increases logistics overhead. Restricted airspace adds lead time for permission filing.
- Report Depth: Standard defect list vs full radiometric TIFF + orthomosaic + geo-tagged dataset + dashboard access.
- Travel Requirements: Remote sites in Rajasthan and Gujarat require multi-day deployment. Same-state bundling reduces per-MW cost.
- Turnaround Timeline: Standard 24-48 hour report delivery depending on site scale. Expedited processing available for urgent requirements.
- Portfolio Bundling: Sites within the same state bundled into a single mobilization significantly reduces per-MW cost at scale.
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
A major 60MW ground-mount plant in Rajasthan — prone to vegetation due to its environment — required thermal inspection as part of an asset transfer due-diligence process. Lesoko's drone covered all 1,90,476 modules over 36 hours, delivering a comprehensive module-level repair/replace report.
Outcomes Achieved
Defect Breakdown — % of 60MW
A 31.4MW floating solar installation experienced persistent performance issues and suspected cable damage from aquatic wildlife (turtles, fish). Lesoko was deployed on a recurring basis to provide rapid defect data. Despite modules being cleaned the day before inspection, bird drop defects accounted for 11.4% of total plant capacity.
Outcomes Achieved
Defect Breakdown — % of 31.4MW
Watch Our Drone Solar Panel Inspection in Action
Our Amazing Clients
What Solar Plant Operators Say
Project Deliverables & Sample Outputs
Geo-tagged raw imagery
Georeferenced ortho map
Interactive defect map
Defect list & summary (Excel)
PDF inspection report
Dashboard access
Request an Inspection Proposal for Your Solar Assets
Phone/ Whatsapp
+91 78457 26375/ 7845726374
Email Us
sales@lesoko.in
Head Office
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Frequently Asked Questions
Drone thermal inspection detects hotspots, multiple hotspots, bypass/strip diode failure, module hotspots, string reverse polarity, open circuits, PID, micro-cracks, soiling, shadow and shading, physical damage, bird droppings, vegetation encroachment and water ingress. Radiometric sensors detect temperature differences invisible to the naked eye, identifying far more fault types than manual visual inspection.
Every anomaly is classified by ΔT — the temperature differential against the surrounding panel: 0–5°C is Low Impact (no action needed), 5–10°C is Medium Impact (check and rectify within a reasonable period), and above 10°C is High Impact (prompt interruption of operation, often a candidate for I-V curve root-cause testing).
Annual aerial thermography is the minimum recommended frequency for utility-scale assets. High-capacity farms above 100 MW benefit from bi-annual surveys, and post-storm or post-hail inspections should be triggered by the event itself, regardless of the scheduled cycle.
Within 48 hours for sites above 10 MW across India, with same-day deployment available in Chennai, Bengaluru and Hyderabad. Restricted-airspace sites near airports or defence installations require a minimum 10-day lead time to complete DGCA permission filing, and remote sites need multi-day logistical planning factored into the timeline.