Delivery & Service Manager / Engineer – BESS Utility

LONGi Solar; Poland; On-site; PLN 120,000 - 190,000; Full time

Job summary

LONGi Solar in Poland is seeking a BESS Delivery & Service Engineer (Utility Scale) to lead technical delivery, commissioning and O&M support for large-scale battery energy storage projects, coordinating with EPCs, grid operators and project stakeholders.

You will oversee project handover, commissioning plans and field QA, ensure safety and compliance, and mentor subcontractors while guiding the integration of BESS, EMS, PCS and MV transformers.

Qualifications

• Degree in Electrical Engineering, Power Systems, Energy Engineering, or related field.
• 2–5 years’ experience in utility-scale renewable energy or power infrastructure projects.
• Certifications to work on site are required.
• Experience with large-scale BESS, solar + storage, or grid infrastructure is preferred.
• Strong understanding of Grid integration, Power systems, Energy management systems, High‑voltage systems, HSE.

Responsibilities

• Take over BESS projects from the sales and presales teams after contract signing.
• Review technical proposals, system configurations, and service scope.
• Confirm system design and project requirements with internal teams and customers including: System design, Grid requirements, Performance guarantees, Project schedules, etc
• Ensure project milestones are achieved according to schedule and budget.
• Manage the full lifecycle delivery of utility-scale BESS projects.
• Coordinate with EPC contractors, integrators, and equipment suppliers. Guide EPC for the equipment unloading, installation etc.
• Ensure compliance with technical specifications, grid requirements, and safety standards.
• Develop and execute commissioning plans, procedures, and checklists for BESS projects.
• Conduct commissioning for battery racks, BMS, PCS, EMS and MV transformer.
• Validate integration of electrical, control, and communication systems.
• Conduct grid compliance and performance verification tests
• Work with grid operators and technical partners to complete system integration and SAT.
• Work with technical support teams to resolve technical issues during commissioning.
• Ensure successful handover to operations.
• Carry out preventive and corrective maintenance on BESS/PCS/EMS
• Perform remote operations to support maintenance and fault resolution
• Conduct site inspections, diagnostics, and testing using specialist equipment
• Ensure strict compliance with Health & Safety standards and HSE regulations in related countries
• Supervise subcontractors and ensure quality and compliance of third‑party works
• Support commissioning, upgrades, and major repairs
• Review technical documentation and contribute to maintenance procedures, RAMS, and method statements
• Liaise with OEMs and suppliers on maintenance processes and technical clarifications
• Support annual maintenance planning for BESS assets
• Provide O&M Training to customer O&M team and subcontractor

Skills

BESS knowledge

LV systems

Inverters

EMS

Education

Electrical/Power Engineering degree

Job description

The BESS Delivery & Service Engineer (Utility Scale) is responsible for the execution and lifecycle support of large‑scale battery energy storage projects after the project is secured by the sales and presales teams.

The role manages the technical delivery, commissioning, and operational & maintenance support of utility‑scale BESS projects, working closely with EPC contractors, grid operators, and project stakeholders.

Key Responsibilities

1. Project Handover from Sales / Presales

• Take over BESS projects from the sales and presales teams after contract signing.
• Review technical proposals, system configurations, and service scope.
• Confirm system design and project requirements with internal teams and customers including: System design, Grid requirements, Performance guarantees, Project schedules，etc
• Ensure project milestones are achieved according to schedule and budget.

2. Project Commissioning Planning and Execution

• Manage the full lifecycle delivery of utility‑scale BESS projects.
• Coordinate with EPC contractors, integrators, and equipment suppliers. Guide EPC for the equipment unloading, installation etc.
• Ensure compliance with technical specifications, grid requirements, and safety standards.
• Develop and execute commissioning plans, procedures, and checklists for BESS projects.
• Conduct commissioning for battery racks, BMS (Battery Management System), PCS (Power Conversion System), EMS (Energy Management System) and MV transformer.
• Validate integration of electrical, control, and communication systems.
• Conduct grid compliance and performance verification tests
• Work with grid operators and technical partners to complete system integration and SAT.
• Work with technical support teams to resolve technical issues during commissioning.
• Ensure successful handover to operations.

4. Operations & Maintenance Service Management

• Carry out preventive and corrective maintenance on BESS/PCS/EMS
• Perform remote operations to support maintenance and fault resolution
• Conduct site inspections, diagnostics, and testing using specialist equipment
• Ensure strict compliance with Health & Safety standards and HSE regulations in related countries
• Supervise subcontractors and ensure quality and compliance of third‑party works
• Support commissioning, upgrades, and major repairs
• Review technical documentation and contribute to maintenance procedures, RAMS, and method statements
• Liaise with OEMs and suppliers on maintenance processes and technical clarifications
• Support annual maintenance planning for BESS assets
• Provide O&M Training to customer O&M team and subcontractor

Qualifications

• Degree in Electrical Engineering, Power Systems, Energy Engineering, or related field.
• 2–5 years’ experience in utility‑scale renewable energy or power infrastructure projects.
• Necessary Certifications to work on site
• Experience with large‑scale BESS, solar + storage, or grid infrastructure preferred.
• Strong understanding of Grid integration, Power systems, Energy management systems, High‑voltage systems, HSE

Skills

• Strong technical knowledge of BESS, LV systems, inverters, EMS
• Knowledge of grid compliance and power system integration
• Ability to manage multiple technical stakeholders