( Junior- Senior) Site Commissioning Engineer-UK

CATL; Greater London; On-site; GBP 45,000 - 65,000; Full time

Job summary

CATL is seeking a commissioning engineer to support large-scale Battery Energy Storage System projects. You will perform on-site commissioning, troubleshoot electrical and BMS/PCS/EMS components, and drive SAT and grid-connection tests with the project team.

Fluent English is required for site communication, with Mandarin proficiency advantageous. Willingness to travel extensively and undertake long-term assignments across Europe and other locations is essential.

Qualifications

• Bachelor's degree or above required.
• Majors in Electrical Engineering, Energy, or Renewable Tech preferred.
• 1–3 years in electrical equipment commissioning or energy projects; 5+ for managerial track.

Responsibilities

• Participate in commissioning, project delivery, and SAT for large BESS projects.
• Perform troubleshooting and defect resolution for battery containers/cabinets (DC up to 1500V DC; AC 220/400V).
• Assist with PCS/EMS commissioning and on-site fault analysis.
• Provide customer training on system operation and maintenance.
• Track issues through to closure and ensure schedule adherence.
• Collaborate with R&D, QA, After-Sales, and Project Management.
• Ensure compliance with EHS requirements during commissioning.

Skills

Electrical schematics reading

BESS knowledge

Teamwork

English on-site communication

Willingness to travel

Problem solving

Education

Bachelor's degree or above

Electrical Engineering or related discipline

Renewable Energy Technology

Tools

CAN protocol

Modbus RTU/TCP

Microsoft Office

Job description

Participate in the commissioning, project delivery, and acceptance of large-scale Battery Energy Storage System (BESS) projects.

Perform commissioning, troubleshooting, and defect resolution for battery containers/cabinets, including:

DC Circuits (up to 1500V DC)

Auxiliary AC Circuits (220V/400V AC)

BMS Communication Systems

Assist with the commissioning of PCS (Power Conversion System) and EMS (Energy Management System), with a basic understanding of their operating principles.

Support on-site issue analysis, fault diagnosis, corrective actions, and issue closure together with the project team.

Participate in Site Acceptance Testing (SAT), grid connection testing, and project acceptance activities.

Support customer training on system operation, maintenance, and product usage.

Track commissioning issues through to closure and ensure projects are delivered according to schedule.

Collaborate with cross-functional teams (R&D, Quality, After-Sales Service, Project Management, etc.) to resolve site issues efficiently.

Comply with EHS (Environment, Health & Safety) requirements and ensure safe execution of all commissioning activities.

Qualifications

• Bachelor's degree or above.
• Preferred majors include Electrical Engineering, Communication Engineering, Energy Engineering, Renewable Energy Technology, or related disciplines.
• 1-3 years (Engineer), 5 yrs+ (Manager) of experience in electrical equipment commissioning, energy projects, or related industries.
• Familiarity with one or more of the following areas:
• Basic knowledge of primary and secondary electrical systems;
• Energy storage systems, photovoltaic (PV) systems, and power systems;
• Basic principles of BMS, PCS, and EMS;
• Industrial communication protocols such as CAN and Modbus RTU/TCP;
• Communication networks and fieldbus technologies.
• Ability to read and understand electrical schematics, wiring diagrams, and communication topology drawings.
• Knowledge of BESS grid-connection processes, substation equipment, and power plant delivery procedures is preferred.
• Proficient in Microsoft Office and other standard office software.
• Strong analytical, communication, coordination, and teamwork skills.
• Fluent in English for daily work and on-site communication; Mandarin Chinese proficiency is required.
• Willingness to travel extensively and undertake long-term assignments at project sites overseas, including Europe and other international locations.

Preferred Qualifications

• Experience in Battery Energy Storage Systems (BESS), photovoltaic (PV), or wind power projects.
• Low-voltage and/or high-voltage electrical certification, or equivalent electrical qualifications.
• Experience working on international projects or in a multicultural environment.
• Additional language skills such as German, Spanish, or French are an advantage.