Solution Engineer - ESS

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, switch gear, 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,…