Senior BESS Engineer – Sizing & Battery Technology

Senior BESS Engineer – Sizing & Battery Technology

Location: Juno Beach, FL – Hybrid
Contract: 12 Months
Pay Rate: Up to $52.96 per hour

We are seeking an experienced Senior BESS Engineer to support a Utility Scale Energy Storage team, providing technical expertise across battery energy storage system (BESS) sizing, optimization, battery technology and power conversion systems (PCS).

This position will serve as a technical Subject Matter Expert supporting utility-scale energy storage projects and the evaluation of existing and emerging storage technologies.

The successful candidate will combine strong engineering fundamentals with hands-on BESS sizing experience and an innovative approach to engineering tools, automation, data analytics and emerging technologies.

• Provide technical leadership for utility-scale BESS sizing methodologies, assumptions, optimization and project-specific sizing decisions.

• Develop and optimize end-to-end BESS sizing from the point of interconnection through GSU/substation, PCS/inverters, DC systems and battery equipment.

• Account for system losses, battery degradation, augmentation and overbuild strategies, temperature effects, operating constraints and contractual requirements.

• Ensure sizing solutions align with power purchase agreements and project-specific technical requirements.

• Develop, maintain and continuously improve BESS sizing methodologies, calculators, assumptions and technical guidance.

• Maintain accurate records of sizing inputs, assumptions, technical decisions and results throughout project development and execution.

• Review project-specific sizing results and identify optimization opportunities, risks and potential improvements.

• Provide sizing recommendations to Engineering, Development, Supply Chain and project teams.

• Maintain sizing tools and equipment databases to incorporate current BESS and PCS ratings and technical characteristics.

• Evaluate existing and emerging battery technologies for utility-scale applications.

• Perform technical assessments covering degradation, efficiency, available energy, reliability, state of charge (SOC) and state of health (SOH).

• Evaluate battery performance from cell and module level through complete system applications.

• Assess emerging and alternative energy storage technologies for new use cases and regional market requirements.

• Evaluate technologies based on technical maturity, performance, safety, scalability, supply chain readiness and commercial viability.

• Develop preliminary system sizing and CAPEX estimates for alternative energy storage technologies.

• Support technology selection, business-case development, pilot projects and commercial deployment decisions.

• Analyze vendor RFP and RFI information to track technology developments, product roadmaps, performance and commercial readiness.

• Summarize technical findings and provide recommendations to engineering and management teams.

• Develop and improve engineering tools used for BESS sizing, technical evaluations and battery performance forecasting.

• Automate repetitive engineering calculations and workflows where appropriate.

• Apply data analytics and software-based tools to improve engineering productivity, consistency and decision-making.

• Utilize tools such as Excel/VBA, Python, Power BI, low-code platforms and AI-assisted engineering applications where appropriate.

• Identify practical applications for emerging technologies and AI within energy storage engineering.

• Partner with software development and technical teams to translate engineering methodologies into scalable digital tools and automated workflows.

• Bachelor's or Master's degree in Electrical Engineering,…