BESS Maintenance and Testing Services Australia

BESS maintenance covers the scheduled testing, inspection, and condition monitoring of all high-voltage electrical components within a battery energy storage facility. While the battery management system (BMS) and power conversion system (PCS) are typically maintained under OEM warranty or service agreements, the HV balance of plant requires independent specialist attention from engineers with deep substation maintenance experience.

• Point list verification – Confirmation of all control, status, analogue, and alarm points between site SCADA, BESS EMS, and NSP/AEMO control rooms.
• Communications testing – DNP3, IEC 61850, and Modbus protocol verification. Redundancy and failover testing of communication paths.
• Alarm management review – Verification of alarm priorities, suppression logic, and escalation paths.

• Secondary injection testing – Verification of all protection relay settings, trip times, and scheme logic using Omicron CMC 356 and CMC 500.
• Scheme functional testing – End-to-end verification of intertripping, breaker failure, busbar protection, and differential protection schemes.
• CT and VT verification – Ratio, polarity, and burden testing of instrument transformers.
• Settings review – Audit of applied settings against approved protection settings schedules and network requirements.

• Electrical testing – Turns ratio, winding resistance, insulation resistance, tan delta, SFRA, and excitation current.
• Oil sampling and analysis – Dissolved gas analysis (DGA), standard oil tests (BDV, moisture, acidity, IFT), and furan analysis. DGA interpreted using Duval Triangle and Key Gas methods per IEEE C57.104-2019 and IEC 60599; oil quality assessed to AS 60422:2017 and AS/NZS 1767.2.1:2024.
• OLTC maintenance – Dynamic resistance measurement, transition timing, motor current analysis, and compartment oil sampling.
• Cooling system verification – Fan and pump operation, oil flow, temperature gauges, and cooling control logic.

• Functional operation testing – Open/close timing, contact resistance (micro-ohm), insulation resistance, and mechanical operation count verification.
• SF6 gas monitoring – Gas pressure, moisture content, and SO2 checks for GIS and SF6-insulated switchgear.
• Arc flash protection verification – Light sensor and trip time testing where arc flash detection relays are installed.

• Earth grid testing – Earth resistance measurement, step and touch potential verification, and bonding continuity.
• DC systems – Battery charger testing, DC distribution, changeover schemes, and UPS verification.
• Fire detection and suppression – Functional testing of enclosure fire detection systems and verification of integration with BMS shutdown and SCADA alarm annunciation.
• HVAC and thermal management – Verification of enclosure cooling systems and temperature monitoring integration with BMS.

Megavar maintains a 200+ instrument test equipment fleet, including the CMC 356, CMC 500, CPC 100, CP CU1, CT Analyzer, and CIBANO 500 circuit breaker analyser. Complemented by Megger insulation resistance testers, circuit breaker analysers, partial discharge detection equipment, FLIR thermal imaging cameras, and AEMC earth testers. All equipment is calibrated with NATA-traceable certificates and is also available for hire from Megavar's rental fleet.

• BESS commissioning experience – Many of the BESS assets we maintain were also commissioned by Megavar. This continuity means our maintenance engineers already understand the system configuration, protection philosophy, and any issues identified during commissioning.
• Independent and technology-agnostic – We work across all BESS manufacturers and have no commercial relationship with any OEM, ensuring unbiased condition assessment.
• Omicron test equipment fleet – The preferred platform for modern digital protection and control systems.
• Digital field data collection – Real-time reporting on tablets and iPhones with complete digital maintenance records.
• National coverage: offices in Tasmania, SA, NSW and Queensland. We deploy anywhere in Australia.
• ISO 9001, 14001, 45001 certified – Quality, environmental, and safety management certified.

Megavar provides BESS maintenance and testing services nationally from offices in Tasmania, South Australia, New South Wales and Queensland. We deploy to BESS installations across all states and territories, from metropolitan sites to remote regional locations.