Electrical Design Engineer (BESS – Utili...

Larsen & Toubro Limited; Bengaluru; On-site; INR 4,000,000 - 7,000,000; Full time

Job summary

DEIC-L&T Precision Engineering & Systems IC in Bengaluru is seeking a Lead Electrical Design Engineer for BESS – Utility & Industrial. You will design, validate, and document electrical systems for large-scale battery energy storage, ensuring safety and grid compliance.

The role focuses on HV/LV architecture, protection coordination, cable routing, and interface with BMS/EMS. Eligibility includes a BTech/MTech in Electrical Engineering and 12+ years of relevant experience, with exposure to

Qualifications

• Bachelor’s or Master’s in Electrical Engineering or related field.
• 12+ years in electrical design for BESS, solar, UPS, or power systems.
• Experience with HV/LV architecture, protection schemes, grounding, and interconnection.
• Knowledge of global standards (UL, IEC, IEEE, NFPA).

Responsibilities

• Develop electrical architecture for containerized/modular BESS with HV racks and PCS integration.
• Create SLDs, wiring diagrams, and interconnection drawings.
• Define cable sizing, protection and busbar design, and interconnect details.
• Prepare BOMs, installation manuals, and documentation for certifications.
• Support FAT/SAT, field commissioning, and EC/UL certification activities.
• Collaborate with BMS/EMS, mechanical, and control teams.

Skills

DC/AC power systems

AutoCAD Electrical

EPlan

SolidWorks Electrical

ETAP/Digsilent (adv)

Protection coordination

HV/LV cabling & wiring

BESS architectures

Education

Electrical Engineering (BTech/MTech)

Tools

AutoCAD Electrical

EPlan

SolidWorks Electrical

ETAP/DigSilent

Job description

Electrical Design Engineer (BESS – Utili...

Electrical Design Engineer (BESS – Utili...

LNT/EDE-U/1716400

• DEIC-L&T Precision Engineering & Systems IC
• Bengaluru

Posted On 22 Apr 2026

End Date 19 Oct 2026

Required Experience 12 - 20 years

Skills

Knowledge & Posting Location

Design Power Systems

Bachelor of Technology (BTech)

Job Description

Manager Electrical Design Engineer(BESS – Utility & Industrial)

Job Description

Lead Electrical Design Engineer (BESS – Utility & Industrial)

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 safe, 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 enclosure layout, HVAC panel integration, and mounting systems.
• Prepare FAT/SAT test procedures for electrical systems.
• Support prototype builds, subsystem testing, and field commissioning.
• Validate system performance through electrical measurements and simulations.
• Collaborate with Battery engineering, Power electronics/PCS engineering. Thermal/HVAC teams, Fire safety teams, Mechanical engineering, Firmware & controls, Supply Chain
• Provide technical support to sales, application engineering, and project delivery teams.

Required Qualifications

Bachelor’s or Master’s in Electrical Engineering, Power Engineering, or related fields.

Technical Skills

• Strong knowledge of DC and AC power systems (up to 1500 VDC, 400–800 VAC, MV if applicable).
• Experience with cable sizing, protection coordination, and grounding.
• Proficiency with design tools such as AutoCAD Electrical, EPlan, or SolidWorks Electrical.
• Knowledge of ETAP/DigSilent for fault and protection studies (advantage).
• Understanding of PCS, BMS, EMS, and thermal system interaction.
• Familiarity with global standards (UL, IEC, IEEE, NFPA).

Experience

• 12 years in electrical design for BESS, Solar Inverters, UPS, EV Charging, or power systems.
• Experience with lithium-ion safety, HV DC systems, and grid interconnection is strongly preferred.

Experience supporting FAT/SAT and field commissioning is an advantage.