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Independent Quality Assurance for Your Investments:
Owner's Engineer & Independent Engineer

Accepting the EPC contractor's work solely on the basis of their own declarations can result in 5–15% performance losses over the plant's 25–30 year operational lifetime. Independent technical inspection on behalf of international financial institutions, funds and investors.

Inspection & Assessment Architecture

Detailed 4-Phase Inspection Process

From design stage through factory production, site installation and operational health check-ups, we serve as independent technical eyes across all processes, to IEC, EN and ISO standards.

01Phase 01

Design, Specification & Project Compliance Review (Design Review)

Before construction begins, the EPC contractor's engineering designs and technical specifications are reviewed independently.

  • EPC Specification & Tender Package Review: Technical specifications, warranty criteria and equipment lists reviewed to protect investor interests
  • PVSyst & Shadow Analysis Verification: Independent cross-verification of EPC-submitted production simulations and 3D shading models
  • Structural, Electrical & MV Design Review: DC/AC cable sizing, earthing and transformer station designs verified for standards compliance
Design ReviewPVSyst Cross-CheckEPC Specification
02Phase 02

Factory and Site Acceptance Tests (FAT / SAT)

Equipment passes quality control at factory production lines and on site arrival before reaching the field.

  • Factory Acceptance Tests (FAT): Production line inspection at solar module, inverter and transformer factories; flash test data analysis and sample-based IEC test witnessing
  • Site Acceptance Tests (SAT): Detection of transport damage, micro-crack status and invoice/serial number compliance on equipment delivered to site
FATSATFlash TestMicro Crack
03Phase 03

Construction & Installation Phase Owner's Engineering (Construction Supervision)

Site operations are monitored in real time. Weekly progress reports are submitted to the investor alongside the EPC contractor.

  • Mechanical & Infrastructure Inspection: Pile pull tests, construction corrosion coating, roof waterproofing details and safety infrastructure
  • Electrical & Cabling Inspection: DC string cabling, connector torque, cable tray fill rates, inverter installations and earthing network
  • HSE & Schedule Monitoring: HSE compliance inspection and weekly/monthly progress reports submitted to the investor
Construction SupervisionProgress ReportHSE Inspection
04Phase 04

Operational Period Health Check-Up, PR & Non-Destructive Testing

Performance ratios and health status of operating plants are diagnosed with high-precision measurement technologies.

  • Thermal Drone & Hotspot Analysis: Autopilot thermal drone flights mapping panel hotspots, bypass diode failures and string disconnections with location coordinates
  • I-V Curve & EL (Electroluminescence) Tests: Per-string power degradation detection; invisible micro-crack diagnosis with portable EL devices
  • PR Analysis & Guaranteed Production Verification: Net Performance Ratio calculation per IEC 61724 standard and verification of EPC warranty terms
Thermal DroneI-V CurveEL TestIEC 61724PR Analysis
Competitive Advantage

Why AL ENERJİ Site Inspection?

Inspection Power from an Implementer's Perspective

Since we manage the installation and acceptance of our own plants, we identify hidden workmanship defects on site and the critical details EPC contractors may overlook — at first glance.

Advanced Measurement Equipment

We don't just visually inspect plants — we analyse at cell level using high-resolution Thermal Camera Drones, I-V Curve Tracers and portable EL devices.

International Compliance

In addition to domestic projects, we prepare inspection and quality assurance (QA/QC) reports to IEC standards for investors in Eastern Europe and regional markets.

Scope Matrix

Sector Technical Standards & Equipment Matrix

Relevant IEC/ISO standard, equipment used and AL ENERJİ output report by inspection and test type.

Inspection & Test Type Relevant IEC / ISO Standard Equipment Used AL ENERJİ Output Report
Site Acceptance IEC 62446-1 / IEC 62446-2 Insulation Resistance Meter, Earth Impedance Meter IEC-Certified Plant Acceptance & Safety Certificate
Thermal Inspection (Infrared) IEC 62446-3 / ISO 18434-1 High-Resolution Radiometric Thermal Drone / Camera Ortometric Hotspot & Fault Map Report
I-V Curve Analysis IEC 61829 / IEC 60904 1500V / 30A Portable I-V Curve Tracer Per-String Power Loss & Degradation Report
Micro-Crack (EL) Test IEC 61215 / IEC 61730 Mobile Field Electroluminescence (EL) Camera Cell-Level Micro-Crack & Breakage Report
PR (Performance) Analysis IEC 61724-1 / EN 50524 Calibrated Pyranometer, Temperature Sensor & SCADA IEC 61724 Net PR & Production Verification
Frequently Asked Questions

About Site Inspection

What is the difference between the Owner's Engineer and the EPC Contractor?+
The EPC contractor is the builder responsible for the design, procurement and installation of the plant. The Owner's Engineer is the independent engineering authority that directly protects the investor's or lender's interests, independently reviewing the EPC contractor's design, materials and site work, and conducting acceptance tests on behalf of the client.
How often should Thermal Drone inspection be carried out on solar power plants?+
Thermal Drone inspections are recommended at the plant acceptance stage (pre-COD) and at least once per year during commercial operation. High-resolution thermal drones can scan thousands of panels within hours, detecting invisible cell overheating (hotspots), open-circuit strings, broken panels and bypass diode failures with location-based coordinates.
Why is the Performance Ratio (PR) critical during Plant Acceptance?+
Performance Ratio (PR) is the efficiency coefficient showing the ratio of the plant's actual output on site to its theoretical irradiation potential (typically between 80–87%). Low PR indicates cable losses, inverter inefficiencies, panel soiling or shading. Verification of the PR value committed to by the EPC contractor on site to the IEC 61724 standard is the main acceptance criterion.
How does Electroluminescence (EL) testing detect micro-cracks on site?+
Hairline cracks in silicon cells caused by transport, foot traffic or hailstorms cannot be seen with the naked eye. In EL testing, reverse current is applied to the panel, causing the cells to emit infrared light. In images taken with specialist EL cameras, cracked areas that carry no current appear as dark regions, allowing future power losses to be pre-diagnosed before they manifest.
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