Job Title: Technical Expert : Battery Energy Storage Systems (BESS) Department: Global Maintenance Services (GMS) AMEA

Location:
Pune, India Reporting To: Lead – GMS AMEA Role Overview: The Technical Expert : Battery Energy Storage Systems (BESS) is a senior specialist role responsible for in-depth diagnostics, testing, performance evaluation, and reliability enhancement of utility-scale stand-alone BESS and hybrid (Solar + BESS / Wind + BESS) systems. The role requires 8-10 years of hands-on BESS project analysis, solid expertise in battery technology, power conversion systems, controls, and advanced capabilities in battery testing, degradation assessment, safety engineering, and system-level analysis.

Key Responsibilities
• BESS Diagnostics, Repair & Maintenance:
• Lead hands-on fault diagnostics at cell, module, rack, PCS, EMS/PMS, and system levels.
• Perform inspection and repair for battery modules, sensors, racks, contactors, and battery protection systems.
• Conduct thermal imaging, impedance spectroscopy, load testing, and post-repair verification.
• System-Level Analysis – Stand-Alone & Hybrid BESS:
• Evaluate power dispatch performance, grid interaction, and transient response for stand-alone BESS.
• Analyze hybrid interactions involving inverters, PCS, MPPT, and grid controllers for renewable smoothing and firming.
• Assess renewable variability impact on battery degradation.
• Battery Technology Expertise & Testing:
• Provide deep technical expertise on Li-ion chemistries: LFP, NMC, NCA, LTO.
• Conduct cell/module cycle testing, capacity testing, stress testing, and degradation profiling.
• Review OEM test reports, UL9540A data, and IEC conformity.
• BMS & Controls:
• Diagnose BMS firmware and SOC/SOH algorithms.
• Analyze balancing performance, sensor biases, and derating logic.
• Evaluate PCS control loops and EMS algorithms for scheduling and charge control.
• Root Cause Analysis & OEM Engagement:




• Lead RCAs for thermal events, imbalance, degradation, and PCS failures.
• Prepare detailed RCA reports and corrective/preventive recommendations.
• Coordinate with OEM engineering for design corrections and firmware updates.
• Warranty, LTSA & Insurance Support:
• Validate warranty claims using cycle count, SOH data, and event logs.
• Provide technical evidence for insurance claims.
• Assess refurbishment vs repowering strategies for aging assets.
• Spare Parts Strategy & Procurement Support:
• Define critical spare parts strategies for modules, CMUs, relays, sensors, and PCS components.
• Evaluate supplier quality and warranty reliability.
• Site-Level Technical Support:
• Support site teams during breakdowns, anomalies, and safety events.
• Guide commissioning, upgrades, and critical maintenance.
• Analyze event logs, SCADA, EMS/PMS data, and grid parameters.
• Monitoring Platforms & Diagnostic Tools:
• Use EMS/PMS/SCADA for predictive diagnostics.
• Detect early degradation signs and recommend life-extension strategies.
• Cross-Functional Collaboration:
• Work with engineering, digital, and asset management to drive reliability.
• Share insights for design improvements and procurement decisions.
• Process Standardization & Compliance:
• Develop SOPs for diagnostics, safety protocols, and reporting.
• Ensure compliance with IEEE, IEC, and UL standards.
• Qualifications &

Experience:
• Bachelor's or Master's in Electrical Engineering, Power Electronics, or Energy Storage.
• Minimum 8-10 years of hands-on BESS experience.
• Expertise in battery technology, PCS, BMS, EMS/PMS, and degradation analysis.
• Key Competencies:
• Battery technology, degradation mechanisms & safety engineering.
• PCS troubleshooting and grid-interaction analysis.
• RCA leadership for battery/PCS/system failures.
• Hybrid system technical expertise.
• Spare-part strategy & lifecycle planning.

📌 BESS Expert (India)
🏢 ENGIE India
📍 India