Manager - Testing & Commissioning - PV Inverter Specialist

LT-Larsen & Toubro; Riyadh; On-site; SAR 350,000 - 520,000; Full time

Job summary

LT-Larsen & Toubro seeks a Testing & Commissioning Manager – PV Inverter Specialist to lead commissioning of inverter systems in large-scale solar PV plants in Saudi Arabia. You will oversee pre-commissioning, energization, grid compliance, and coordination with PPC, SCADA, and grid stakeholders.

The role requires deep inverter knowledge, hands-on testing, and strong leadership for safe energization and early operation, with experience in IEC standards and OEM collaboration.

Qualifications

• Bachelor's degree in electrical/power engineering or equivalent.
• Minimum 12–15 years solar inverter commissioning experience.
• Grid-code compliance testing experience mandatory.

Responsibilities

• Lead inverter pre-energization checks (DC, AC, control, auxiliary).
• Coordinate inverter commissioning activities with PPC, SCADA, and protection engineers.
• Perform first synchronization and power ramp-up.
• Support LVRT/HVRT and power quality validation tests.
• Develop commissioning records, test reports, and handover documentation.
• Troubleshoot inverter performance using logs and trend data.

Skills

Inverter architectures

Grid-interactive control

Firmware analysis

Site leadership

HV safety

Education

Bachelor’s Degree – 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

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

A. 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.

B. 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

C. 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

D. 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

Identify and resolve:

• 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.