Manager - Testing & Commissioning - PV Inverter Specialist

Larsen & Toubro; Riyadh; On-site; SAR 391,000 - 670,000; Full time

Job summary

Larsen & Toubro in Saudi Arabia seeks a Testing & Commissioning Manager – PV Inverter Specialist to lead the technical commissioning of inverter systems in large-scale solar PV plants, ensuring safe energization, grid-code compliance, and reliable operation with PPC, SCADA, and grid infrastructure.

You will coordinate with PPC engineers, SCADA teams, and grid utility partners; review drawings, protection philosophies, and control architectures; develop test procedures; and deliver commissioning

Qualifications

• Bachelor’s degree in Electrical or Power Engineering.
• 12–15 years of solar inverter commissioning experience.
• Direct OEM commissioning exposure preferred.
• Grid-code compliance testing experience mandatory.

Responsibilities

• Lead technical commissioning of large-scale PV inverter systems.
• Review inverter drawings, protection philosophy, and control architecture.
• Coordinate with PPC, SCADA, and grid teams during commissioning and startup.
• Prepare commissioning records and handover documentation.
• Ensure IEC 62109-1/2, IEC 61727, IEC 62116 compliance and grid integration tests.

Skills

Inverter architectures

Grid-interactive control

HV safety

Site leadership

Education

Bachelor’s Degree in Electrical / Power Engineering

Tools

Modbus

IEC-104

Job description

Testing & Commissioning Manager – (PV Inverter Specialist)

This position is responsible for the technical leadership of inverter system commissioning. This position is responsible for the technical leadership of inverter system commissioning in large-scale solar PV power plants across projects, ensuring safe energization, grid-code compliance, reliable operation, and seamless integration with PPC, SCADA, and grid infrastructure. The role acts as the single technical lead for inverter systems during commissioning and early operation.

Core Responsibilities

• Engineering & Pre-Commissioning Phase
• Review inverter system drawings, SLDs, protection philosophy, control architecture, and communication diagrams.
• To provide inputs to Engineering team based on experience with inverters to take care in engineering stage itself.
• components make selection,
• Product Performance related challenges
• Inverter’s limitations based on site experience
• Power quality aspects
• Validate compliance with:
• Local Country grid codes such as KSA, DEWA, EWEC, CEA, etc.
• OEM technical limits
• Project-specific control philosophy
• Support FAT review of inverter controls
• Prepare inverter commissioning method statements, test procedures, and risk
• assessments.
• Site Commissioning Execution
• Lead inverter pre-energization checks (DC, AC, control, auxiliary).
• Supervise stepwise energization of Inverter
• Sensitivity: L&T Construction Internal Use
• Execute first synchronization and power ramp-up.
• Coordinate inverter commissioning activities with:
• PPC engineer
• SCADA team
• Protection & relay engineers
• Substation / grid utility teams
• Ensure inverter configuration aligns with PPC commands
• Grid Compliance & Performance Validation
• Execute and support:
• LVRT / HVRT ride-through tests
• Power factor and reactive capability tests
• Ramp rate and power gradient tests
• Harmonic and power quality assessment
• Support grid acceptance tests and audits.
• Validate inverter operation under existing grid conditions
• Documentation & Handover
• Prepare commissioning records, test reports, parameter backup files.
• Develop inverter O&M handover documentation and lessons learned.
• Support COD and reliability requirements.
• Testing, Commissioning & Troubleshooting
• Responsible for testing and commissioning of grid-connected PV inverters in compliance
• with IEC 62109-1/2, IEC 61727, IEC 62116, IEC 61000 series, UL 1741 & other relevant
• standards

Key Commissioning Tests

• DC insulation resistance, string polarity verification.
• AC insulation, phase rotation, grounding continuity.
• Inverter self-tests and protection validation.
• Communication stability (Modbus / IEC-104, etc).
• Thermal performance under sustained load.

Key Troubleshooting Responsibilities

• Sensitivity: L&T Construction Internal Use
• Inverter derating under high temperature or grid disturbance
• Nuisance trips due to grid voltage/frequency fluctuation
• PPC command mismatches
• DC arc fault / ground fault events
• Transformer / RMU interface issues
• Root cause analysis using logs, oscillography, and trend data.

Key Competencies & Skills

• Expert knowledge of central and string inverter architectures.
• Strong understanding of grid-interactive inverter control modes.
• Ability to analyze inverter firmware behavior under dynamic grid events.
• Excellent coordination and site leadership skills.
• Strong safety mindset for HV and power electronics systems.

Minimum Qualifications

• Bachelor’s Degree – Electrical / Power Engineering.
• 12–15 years of solar inverter commissioning experience.
• Direct OEM commissioning exposure preferred.
• Grid-code compliance testing experience mandatory.