Junior Service Technician

About the Role

We are looking for a Junior Service Technician to support installation, commissioning, troubleshooting, preventive maintenance, and repair of Lithium-ion battery packs, ESS/BESS systems, UPS/inverters, and associated electrical equipment. The candidate will work closely with service engineers, battery engineers, BMS teams, and customers to ensure reliable and safe operation of deployed battery systems.

Key Responsibilities

• Installation & Commissioning
• Support installation of lithium-ion battery packs, ESS units, BMS, UPS/inverters, cables, connectors, and protection devices.
• Perform basic electrical wiring and termination as per approved drawings.
• Assist in battery pack installation, commissioning, and functional testing.
• Verify polarity, voltage, communication connections, grounding, and protection devices.
• Support inverter-battery communication configuration.
• Record commissioning parameters and test results.
• Troubleshooting & Service
• Diagnose basic electrical, BMS, inverter, charging, and communication issues.
• Perform first-level troubleshooting of:
• BMS alarms and faults
• Cell over-voltage / under-voltage
• Over-temperature / under-temperature
• Over-current protection
• Communication failures
• Charging/discharging issues
• Inverter/UPS faults
• Contactor, fuse, MCB and wiring issues
• Use Multimeter, DC clamp meter, insulation tester, Peak CAN, CAN/RS485 tools and other service equipment.
• Escalate complex electrical, BMS, firmware, or software issues to senior engineers.
• Replace defective components/modules under approved service procedures.
• Preventive Maintenance
• Conduct scheduled inspection of deployed battery systems.
• Check:
• Battery voltage
• Cell voltage spread
• Temperature
• SOC/SOH
• BMS status
• Charging/discharging current
• Cable and connector condition
• Fuse/MCB/contactor condition
• Earthing
• Cooling/ventilation
• Physical condition of the battery enclosure
• Carry out preventive maintenance according to service checklists.
• Battery BMS Support
• Monitor battery pack parameters through BMS software/dashboard.
• Download and analyze basic BMS logs.
• Identify abnormal cell voltage, temperature, current and SOC behavior.
• Support BMS configuration and parameter verification under engineering supervision.
• Assist with firmware updates and communication testing where authorized.
• Follow battery isolation and electrical safety procedures before service activities.
• Customer Field Support
• Attend customer complaints and field service calls.
• Explain basic operating and maintenance procedures to customers.
• Provide first-level technical support over phone/video when required.
• Maintain professional communication with customers and site personnel.
• Travel to customer locations for installation, troubleshooting and preventive maintenance.
• Documentation & Reporting
• Maintain service reports, installation reports and commissioning records.
• Record battery serial numbers, BMS IDs, inverter details and replaced components.
• Maintain fault history and corrective-action records.
• Update service tickets after every field visit.
• Maintain spare-parts and service-tool records.
• Escalate recurring failures to the Service Engineer / Engineering team.

Requirements & Tech Stack

• Basic knowledge of DC electrical systems and lithium-ion batteries.
• Understanding of battery pack series/parallel configurations.
• Basic understanding of BMS operation and protection functions.
• Knowledge of voltage, current, power, energy and electrical measurements.
• Basic understanding of UPS, inverter and charger systems.
• Ability to read electrical wiring diagrams and schematics.
• Basic knowledge of CAN / RS485 / Modbus communication is preferred.
• Familiarity with Multimeter and DC clamp meter.
• Basic computer skills for service reports and BMS software.
• Ability to perform systematic electrical troubleshooting.
• Strictly follow battery and electrical safety procedures.
• Follow LOTO (Lockout/Tagout) procedures.
• Verify DC voltage before touching or disconnecting conductors.
• Use appropriate PPE and insulated tools.
• Do not bypass BMS protections, fuses, contactors or safety interlocks without authorization.
• Never short-circuit battery terminals.
• Follow battery handling, transportation and emergency procedures.
• Immediately report damaged, swollen, overheated, leaking or abnormal battery packs.
• Maintain safe working distance and follow site-specific electrical safety requirements.
• Do not perform unauthorized modifications to battery packs or BMS parameters.
• Strong hands-on approach and willingness to work at customer sites.
• Good troubleshooting and problem-solving ability.
• Safety-conscious attitude.
• Ability to follow SOPs and checklists.
• Good communication and customer-handling skills.
• Willingness to travel.
• Ability to work independently as well as with engineering teams.
• Good documentation discipline.

Qualifications

• Preferred: ITI - Electrical / Electronics / Electrician
• Preferred: Diploma - Electrical / Electronics / Mechatronics / Instrumentation
• Diploma/ITI candidates with relevant battery, UPS, inverter or EV experience may also be considered.

Preferred Additional Skills

• Experience with CAN tools / CAN analyzers.
• Basic knowledge of Modbus RTU/TCP.
• Experience with BMS dashboards.
• Knowledge of lithium-ion battery safety.
• Experience with inverter/UPS commissioning.
• Basic understanding of Excel and service-management software.
• Valid driving licence and willingness to travel.