Field Service Technician

Role Summary

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 analyse 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

• Technical Skills

• 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.

• Safety Responsibilities

• Strictly follow battery and electrical safety procedures.

• Follow LOTO (Lockout/Tagout) procedures before working on equipment.

• Verify DC voltage before touching or disconnecting conductors.

• Use appropriate PPE and insulated tools.

• Never 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.

Qualifications

• Educational Qualification Preferred:

• ITI – Electrical / Electronics / Electrician

• Diploma – Electrical / Electronics / Mechatronics / Instrumentation

• Diploma/ITI candidates with relevant battery, UPS, inverter, or EV experience may also be considered.

• Experience Preferred:

• 0–2 years of experience in any of the following areas:

• Lithium-ion battery service

• EV battery packs

• BMS

• UPS/inverter service

• Solar/ESS systems

• Electrical equipment maintenance

• Industrial electronics

• Field service

• Freshers with strong electrical fundamentals and hands-on skills may also be considered.

• Behavioral Competencies

• 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.

• 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 license and willingness to travel.