Role Summary
The BESS Electrical Design Engineer is responsible for the design, analysis, and validation of electrical systems for utility-scale and industrial battery energy storage solutions. The role includes designing HV/LV electrical architecture, protection schemes, cable routing, battery rack wiring, earthing/grounding, and grid interconnection while ensuring compliance with global standards and secure, reliable operation.
Key Responsibilities
- Develop complete electrical architecture for containerized or modular BESS that includes HV battery racks and string design, DC bus architecture, PCS/inverter integration, LV auxiliaries (HVAC, fire systems, controls, lighting)
- Prepare SLDs (Single Line Diagrams), wiring schematics, and interconnection drawings.
- Define cable sizing, protection device selection, busbar design, and interconnection details.
- Prepare technical documentation such as SLD, Wiring diagrams, Protection coordination studies, Electrical BoM (Bill of Materials), Installation manuals




- Support UL/IEC certification activities with required electrical design artefacts.
- Design HV DC circuits including Contactor, Fuses/breakers, DC isolators,
- Define creepage/clearance, dielectric strength, and insulation coordination.
- Design LV AC/DC circuits for auxiliary systems and control circuits.
- Ensure compliance with IEEE, IEC, NEC, CEA, NFPA, UL, and utility grid codes.
- Develop electrical protection strategies: overcurrent, short circuit, earth fault, arc flash, isolation monitoring.
- Work with BMS and EMS teams to align electrical protection with software/logic protection.
- Support arc-flash studies, fault current calculations, and grounding/earthing design.
- Ensure compliance with UL 9540, UL 1973, IEC 62933, and NFPA 855.
- Integrate battery racks, PCS/inverters, MV skids, transformers, HVAC, fire suppression, and control systems.
- Develop cable routing, harnessing plans, and connector specifications.
- Work with mechanical teams on enclos

📌 BESS Electrical Design Engineer (Bengaluru)
🏢 LT-Larsen & Toubro
📍 Bengaluru