Battery Energy Storage Solutions Engineer

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

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.