Solution Engineer - ESS

HappyGlobal Service; Fremont (CA); On-site; USD 90,000 - 130,000; Full time

Job summary

HappyGlobal Service is seeking a motivated Solution Engineer – Battery Energy Storage Systems to join the U.S. Solution Engineering team at the Manteno, Illinois and Fremont, California facilities.

You will support the development of safe, reliable, technically compliant, and commercially competitive BESS solutions, working with customers, sales, product management, manufacturing, and global technical teams.

Qualifications

• Bachelor's degree in Electrical Engineering, Power Systems Engineering, Energy Engineering, Mechanical Engineering, or a related technical discipline.
• Two or more years of relevant engineering experience in battery energy storage, renewable energy, electrical power systems, power electronics, manufacturing, or related industries.
• Basic understanding of electrical systems, including transformers, switchgear, power converters, protection systems, and single‑line diagrams.
• Strong analytical, organizational, and problem‑solving skills.
• Ability to prepare clear calculations, technical documents, presentations, and customer‑facing materials.
• Proficiency with Microsoft Excel, Word, and PowerPoint.
• Strong written and verbal communication skills.
• Ability to manage multiple assignments and meet deadlines.
• Ability to work effectively with local and international teams.
• Ability to work on‑site at the Manteno, Illinois facility.
• Willingness to travel up to approximately 20%, depending on project and customer needs.

Responsibilities

• Support the development of technical solutions for utility‑scale and C&I battery energy storage projects.
• Prepare preliminary system configurations, equipment lists, single‑line diagrams, GA Layout and technical documentation.
• Assist with technical proposals, compliance matrices, equipment specifications, assumptions, exclusions, and technical clarifications.
• Support the sales team during customer discussions and proposal development.
• Participate in customer meetings and present technical information under the guidance of senior team members and the Director of Solution Engineering.
• Identify specification gaps, design conflicts, and technical risks.
• Maintain proposal records, technical assumptions, and customer requirements.
• Collaborate with engineering, sales, manufacturing, project management, and product‑development teams.
• Coordinate with Gotion's international engineering and manufacturing teams.
• Participate in technical training and continuously develop knowledge of battery systems and power‑system applications.

Skills

Strong analytical, organizational, and

problem-solving skills

Proficiency with Microsoft Excel, Word

PowerPoint

Strong written and verbal comms

Ability to manage multiple assignments

Work effectively with local and intl.팀

Willingness to travel up to ~20%

Education

Bachelor's degree in Electrical Engineering, Power Systems Engineering, Energy Engineering, Mechanical Engineering, or a related technical discipline

Tools

ETAP

PSCAD

PSS E

PowerFactory

MATLAB

Python

AutoCAD

Excel-based tools development

Job description

We are seeking a motivated Solution Engineer – Battery Energy Storage Systems to join its U.S. Solution Engineering team at the Manteno, Illinois / Fremont, California facility. This position will report directly to the Director of Solution Engineering and support the development of safe, reliable, technically compliant, and commercially competitive battery energy storage system solutions. The Solution Engineer will work closely with customers, sales, product management, manufacturing, project engineering, supply chain, and global technical teams. This role is well suited for an engineer who has a strong electrical or energy background and wants to develop expertise in utility‑scale battery energy storage systems.

Core Values

• Care: Demonstrates respect, empathy, professionalism, safety, quality, teamwork, and customer focus.
• Pragmatism: Makes practical, data‑driven decisions that balance quality, efficiency, cost, and business needs.
• Integrity: Acts honestly and ethically while maintaining confidentiality and compliance with company policies and laws.
• Innovation: Continuously seeks better ideas, technologies, and processes to improve business performance.

About the Role

BESS Solution Development

• Support the development of technical solutions for utility‑scale and C&I battery energy storage projects.
• Perform preliminary battery, power conversion system (AC/DC), MVT/HVT, auxiliary‑load/ Trans, and balance‑of‑plant sizing.
• Review project requirements, including power, energy, operating duration, ambient conditions, elevation, degradation, efficiency, and project life.
• Assist in selecting appropriate battery system configurations based on customer and project requirements.
• Prepare preliminary system configurations, equipment lists, single‑line diagrams, GA Layout and technical documentation.
• Support the evaluation of standalone energy storage, solar‑plus‑storage, wind‑plus‑storage, microgrid, and AIDC applications.
• Review customer requests for proposals, technical specifications, and interconnection requirements.
• Assist with the preparation of technical proposals, compliance matrices, equipment specifications, assumptions, exclusions, and technical clarifications.
• Support the sales team during customer discussions and proposal development.
• Participate in customer meetings and present technical information under the guidance of senior team members and the Director of Solution Engineering.
• Identify specification gaps, design conflicts, and technical risks.
• Maintain proposal records, technical assumptions, and customer requirements.

Technical Analysis

• Perform or support electrical calculations related to load flow, short circuit, Arc Flash Analysis, auxiliary loads, system efficiency, and equipment ratings.
• Assist with battery degradation, usable‑energy, round‑trip‑efficiency, and augmentation calculations.
• Review the capabilities of power conversion systems, including active power, reactive power, voltage support, frequency response, and fault ride‑through.
• Support the review of interfaces between batteries, battery management systems, power conversion systems, energy management systems, SCADA, transformers, switchgear, and plant controllers.
• Assist with the interpretation and application of relevant electrical codes, energy‑storage standards, and customer requirements.

Engineering Tools and Process Improvement

• Support the development and maintenance of BESS sizing tools, proposal templates, calculation sheets, and technical databases.
• Assist with automating equipment selection, system sizing, proposal generation, and compliance reviews.
• Maintain current product data, approved system configurations, technical specifications, and standard design assumptions.
• Identify opportunities to improve engineering efficiency, design quality, and proposal turnaround time.
• Document lessons learned and help establish consistent engineering processes.

Project Execution Support

• Support the technical handover of awarded projects from the proposal team to project execution.
• Prepare documentation describing project assumptions, customer commitments, open technical items, and identified risks.
• Review customer drawings, vendor documents, technical submittals, and equipment specifications.
• Assist project engineering, commissioning, and field‑service teams with technical questions.
• Participate in design reviews, factory acceptance tests, site acceptance tests, and project meetings as needed.
• Work directly with the Director of Solution Engineering on technical priorities, customer opportunities, and internal improvement initiatives.
• Collaborate with engineering, sales, manufacturing, project management, and product‑development teams.
• Coordinate with Gotion's international engineering and manufacturing teams.
• Participate in technical training and continuously develop knowledge of battery systems and power‑system applications.
• Contribute to a culture of technical quality, accountability, teamwork, and customer responsiveness.

Qualifications

• Bachelor's degree in Electrical Engineering, Power Systems Engineering, Energy Engineering, Mechanical Engineering, or a related technical discipline.
• Two or more years of relevant engineering experience in battery energy storage, renewable energy, electrical power systems, power electronics, manufacturing, or related industries.
• Basic understanding of electrical systems, including transformers, switchgear, power converters, protection systems, and single‑line diagrams.
• Strong analytical, organizational, and problem‑solving skills.
• Ability to prepare clear calculations, technical documents, presentations, and customer‑facing materials.
• Proficiency with Microsoft Excel, Word, and PowerPoint.
• Strong written and verbal communication skills.
• Ability to manage multiple assignments and meet deadlines.
• Ability to work effectively with local and international teams.
• Ability to work on‑site at the Manteno, Illinois facility.
• Willingness to travel up to approximately 20%, depending on project and customer needs.

Preferred Skills

• Master's degree in Electrical Engineering, Power Systems, Renewable Energy, or a related field.
• Previous experience with lithium‑ion batteries, battery energy storage systems, solar power, wind power, microgrids, or data‑center power systems.
• Familiarity with battery management systems, power conversion systems, energy management systems, and medium‑voltage equipment.
• Familiarity with energy‑storage and electrical standards, including:
• NFPA 855
• UL 9540 and UL 9540A
• UL 1973
• UL 1741
• NEC
• IEEE 1547
• IEEE 2800
• Experience with ETAP, PSCAD, PSS E, PowerFactory, MATLAB, Python, AutoCAD, or similar engineering software.
• Experience developing Excel‑based sizing or calculation tools.
• Familiarity with utility interconnection requirements and power‑system studies.
• Experience working in a battery manufacturing, system integration, renewable‑energy, or engineering environment.