BESS Electrical Design Engineer Lead

Job description

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. • Define interface control documents (ICD) for OEM components. • 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 • 5–10 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.