Test Engineer - BESS

Larsen & Toubro; Coimbatore District; On-site; INR 900,000 - 1,400,000; Full time

Job summary

Larsen & Toubro in India is seeking a Battery Energy Storage Systems (BESS) Testing Engineer responsible for validation, testing, and commissioning at component, pack, and container levels. You will develop test plans for battery packs, BMS, PCS, and complete BESS containers; perform electrical, thermal, functional, and safety testing; and conduct FAT/SAT to ensure compliance with IEC/UL/BIS standards.

Collaboration with design, quality, and production is essential.

Qualifications

• B.E / B.Tech / Diploma in Electrical / Electronics / Mechatronics
• 3-8 years experience in BESS, EV, battery, or power electronics testing
• Hands-on with: Battery cyclers and HV testing equipment
• Understanding of CAN and Modbus tools
• Safety practices for high voltage systems

Responsibilities

• Develop and execute test plans for battery packs, BMS, PCS, and BESS containers
• Perform electrical, thermal, functional, and safety testing
• Conduct FAT and SAT inspections and tests
• Validate interfaces between battery, BMS, PCS, EMS, and SCADA
• Test communication protocols (CAN, Modbus, Ethernet)
• Perform charge-discharge cycle testing and efficiency validation
• Ensure testing adheres to IEC, UL, BIS standards for BESs
• Support certification processes and documentation
• Analyze test data and identify performance gaps
• Prepare detailed test reports and failure analyses
• Suggest corrective actions and design improvements
• Diagnose issues in battery systems, wiring, control logic
• Work with design, quality, and production teams
• Define and set up test benches, load banks, cyclers
• Support automation of testing where applicable

Skills

Lithium-ion batteries

BMS

Power electronics

Inverters

HV testing equipment

Data acquisition systems

CAN tools

Modbus tools

Safety practices for HV systems

Education

Electrical/Electronics/Mechatronics degree

Tools

Battery cyclers

HV testing equipment

Data acquisition systems

CAN tools

Modbus tools

Job description

Role SummaryResponsible for validation, testing, and commissioning of Battery Energy Storage Systems (BESS) at component, pack, and container level. Ensures system performance, safety, and compliance with applicable standards.

Key Responsibilities

• Testing & ValidationDevelop and execute test plans for:Battery packs (Li-ion, LFP, etc.)BMS (Battery Management System)PCS (Power Conversion System)Complete BESS containersPerform electrical, thermal, functional, and safety testingConduct FAT (Factory Acceptance Test) and SAT (Site Acceptance Test)
• System Integration TestingValidate interfaces between battery, BMS, PCS, EMS, and SCADATest communication protocols (CAN, Modbus, Ethernet)Perform charge-discharge cycle testing and efficiency validation
• Compliance & StandardsEnsure testing as per standards like:IEC / UL / BIS relevant to BESSSupport certification processes and documentation
• Data Analysis & ReportingAnalyze test data and identify performance gapsPrepare detailed test reports and failure analysisSuggest corrective actions and design improvements
• Troubleshooting & Root Cause AnalysisDiagnose issues in battery systems, wiring, control logicWork closely with design, quality, and production teams
• Test Infrastructure SetupDefine and set up test benches, load banks, cyclersSupport automation of testing where applicable
• QualificationsB.E / B.Tech / Diploma in Electrical / Electronics / Mechatronics3-8 years experience in BESS, EV, battery, or power electronics testingRequired SkillsStrong understanding of:Lithium-ion batteries & BMSPower electronics & invertersHands‑on with:Battery cyclers, HV testing equipmentData acquisition systemsKnowledge of:CAN tools, Modbus toolsSafety practices for high voltage systems