Senior Energy Storage Electrical Engineer

Position Summary
Responsible for electrical system design of supercapacitor energy storage systems, covering single-cabinet to multi-cabinet parallel configurations. Candidates must demonstrate independent design capability for main circuit topology and protection circuits, deep understanding of energy exchange interfaces with external PCS/DCDC, and experience coordinating with EMS (Energy Management System) at the top integration layer, and full lifecycle experience from design to commissioning and field fault resolution. Experiences with energy storage system architectures like centralized, distributed, or cascaded (multilevel/modular multilevel) system architectures are a plus.

Key Responsibilities
1. Electrical System Design
•    Independently complete electrical system design for single-cabinet and multi-cabinet parallel supercapacitor systems, including system topology definition and electrical single-line diagram preparation.
•    Main circuit design including pre-charge circuit and discharge circuit architecture design and calculation.
•    Design secondary control & protection circuits, including CMS (Capacitor Management System) power supply, dry contact signal acquisition, and control logic for auxiliary loads (fans, heaters).
•    Define electrical and communication interfaces between supercapacitor energy storage system and EMS.

2. Critical Component Selection & Supply Chain Knowledge
•    Select and size main circuit components: fuses, DC breakers, pre-charge relays/resistors, main contactors, Hall sensors, busbars/cables.
•    Deep knowledge of component market: Familiar with mainstream domestic and international brands, their product series, performance parameters, and application scenarios.
3. Interface Design with External Systems 
•    Design electrical and communication interfaces between energy storage system and PCS or DCDC converter.
•    Define interface parameters: DC voltage range, maximum continuous current, insulation detection compatibility, pre-charge timing coordination, CAN/RS485 protocol parsing.
•    Understand mainstream PCS manufacturers (Sungrow, Sinexcel, Hopewind, INVT, etc.) and their product parameters; resolve protocol mismatches and protection misoperations during integration.
•    Ensure supercapacitor system is integrated seamlessly with external devices like PCS, DCDC and EMS.
4. Commissioning, Installation & Field Problem Solving
•    Commissioning experience: Participated in at least one commissioned energy storage project (container, outdoor cabinet, or chassis format), with complete system debugging capability.
•    Fault handling: Independently resolve common operational faults such as insulation alarm, communication interruption, pre-charge failure, and overcurrent, overvoltage, temperature protection.
•    On-site resolution: Capable of on-site wiring guidance, abnormal condition analysis, and rapid repair; willing to travel as required.
Qualifications
•    Education: Bachelor’s degree or above in Electrical Engineering, Power Electronics, Automation, or related field.
•    Experience: 10+ years in energy storage, industrial power supply electrical design. Must have independent design experience for supercapacitor or battery systems (single/multi-cabinet).
•    Software: Proficient in AutoCAD Electrical or EPLAN for electrical schematics, wiring diagrams, and harness drawings.
•    Circuit design: Master pre-charge circuit parameter calculation and discharge circuit design.
•    Protection logic: Deep understanding of coordination between main circuit and secondary circuits (e.g., main contactor welding detection, electrical design differences between passive and active balancing).
•    Standards knowledge: Familiar with national and international standards for energy storage systems. 
•    Experiences with different energy storage architectures like centralized, distributed and cascaded topologies are a strong plus.

Clarios is the global leader in advanced, low-voltage battery technologies for mobility. We power progress through ever-smarter solutions for virtually every kind of vehicle. With 16,000 employees in over 140 countries, we bring deep expertise to our Aftermarket and OEM partners, and reliability, safety and comfort to everyday lives. We answer to the planet with a rigorous ESG focus – advancing best-in-class sustainability practices and advocating for them across our industry. Learn more about us at www.clarios.com.

Clarios is the creator behind VARTA vehicle batteries, which are designed to deliver the optimal level of power and longevity for every kind of vehicle. Whether you need batteries for your heavy-duty commercial vehicle, your highly equipped car with Start-Stop, or any kind of electric vehicle – VARTA always offers the right technology for every energy demand.

Equal Employment Opportunity:

We recognize that people come with a wealth of experience and talent beyond just the technical requirements of a job. If your experience is close to what you see listed here, please apply. Diversity of experience and skills combined with passion is key to challenging the status quo. Therefore, we encourage people from all backgrounds to apply to our positions. We are an Equal Opportunity Employer and value diversity in our teams in terms of work experience, area of expertise, gender, ethnicity, and all other characteristics protected by laws in the countries where we operate. For more information on our commitment to sustainability, diversity, and equal opportunity, please read our latest report.

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