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, robust 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, UL****A 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.
Sh
are insights for design improvements and procurement decisions.
Process Standardization & Compliance:
Develop SOPs for diagnostics, safety protocols, and reporting.
Ensu
re 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.

📌 Expert Bess (Maharashtra)
🏢 ENGIE
📍 Maharashtra