Expert BESS

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, strong expertise in battery technology, power conversion systems, controls, and advanced capabilities in battery testing, degradation assessment, safety engineering, and system-level analysis.

Key Responsibilities:

1. 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.

2. 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.

3. 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.

4. 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.

5. 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.

6. 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.

7. Spare Parts Strategy & Procurement Support:

• Define critical spare parts strategies for modules, CMUs, relays, sensors, and PCS components.


• Evaluate supplier quality and warranty reliability.

8. 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.

9. Monitoring Platforms & Diagnostic Tools:

• Use EMS/PMS/SCADA for predictive diagnostics.


• Detect early degradation signs and recommend life-extension strategies.

10. Cross-Functional Collaboration:

• Work with engineering, digital, and asset management to drive reliability.


• Share insights for design improvements and procurement decisions.

11. Process Standardization & Compliance:

• Develop SOPs for diagnostics, safety protocols, and reporting.


• Ensure compliance with IEEE, IEC, and UL standards.

12. 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.

13. 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.