Customer Service Engineer, ESS

Our client is a global leader in energy storage innovation, delivering reliable, high-performance ESS solutions that support the clean energy transition. As part of a rapidly growing international energy business, the company is expanding quickly to meet rising demand across utility, commercial & industrial, and grid-scale projects throughout the Americas.

The
Customer Service Engineer, ESS
will join the Energy Storage Services group. In this role, you'll provide post-installation technical support and troubleshooting for containerized battery energy storage systems deployed across commercial, industrial, and utility-scale projects. You'll serve as the technical liaison for customers, analyzing performance data, resolving system issues, and ensuring high levels of satisfaction through responsive, professional communication.

This is a hands-on role suited for a technically skilled and customer-oriented professional who enjoys problem-solving, field collaboration, and continuous improvement in one of the fastest-growing areas of clean energy.

What You'll Do

• Act as the primary technical contact for customers, handling product performance and service requests across operational energy storage sites.
• Investigate and resolve technical issues related to system performance, control logic, and environmental conditions.
• Analyze BMS and system logs to identify trends, alarms, or fault sequences that could affect performance.
• Lead troubleshooting efforts, providing clear guidance to field service partners or internal teams to resolve issues quickly and safely.
• Support warranty claims, documentation, and root-cause analysis activities for battery modules, racks, and containerized systems.
• Collaborate cross-functionally with engineering, quality, and operations teams to drive corrective actions and preventive improvements.
• Prepare clear, customer-facing technical summaries and service reports.
• Maintain accurate records of service cases, site visits, and lessons learned to support future reliability initiatives.
• Contribute to safety, training, and best-practice development for ongoing operations and maintenance.

The Ideal Candidate Will Have

• Bachelor's degree in Electrical, Mechanical, or Energy Engineering—or equivalent technical experience.
• 3–8 years of hands-on experience in energy storage, renewable energy, or industrial electrical systems.
• Strong understanding of battery system architecture, including BMS, HVAC, fire safety, and thermal management systems.
• Experience diagnosing electrical and communication issues in high-voltage DC or grid-connected systems.
• Proven ability to interpret data logs, alarms, and technical documentation to determine root causes.
• Customer-first mindset with excellent communication and problem-solving skills.
• Ability to work both independently and collaboratively in fast-paced, field-driven environments.
• Familiarity with electrical safety procedures, PPE standards, and lockout/tagout protocols.
• Authorized to work in the U.S. and willing to travel up to 40% nationwide.

Preferred Background

• Prior experience supporting containerized or modular battery systems.
• Understanding of Power Conversion Systems (PCS), Energy Management Systems (EMS), and grid interconnection.
• Exposure to PLC logic, control systems, or fire-safety controls.
• Experience performing Root Cause Analysis or structured problem-solving (5 Whys, FMEA, Fishbone).
• Familiarity with renewable projects such as PV, wind, or hybrid systems.
• Safety certifications such as OSHA 30, NFPA 70E, or equivalent.
• Bilingual or multilingual communication ability (Korean a plus, not required)

Compensation & Benefits

• Base salary range: Flexible depending on experience, typically in the
  $90,000–$130,000
  range
• Comprehensive health, dental, and vision coverage
• 401(k) with company match
• Paid time off, holidays, and parental leave
• Employee wellness programs, telehealth access, and professional development opportunities

Who We Are

Peak Demand is the leading executive search firm focused on solar, renewable energy, and energy storage. Our recruiting specialists are well-connected in the industry, working with some of the most well-respected and fastest-growing companies in renewable energy. We have placed some of the top Business Development, Engineering, and Operations professionals in the industry.

Apply now or to learn more,
contact Sarah Petersen
at