Central Inverter Annual Service and Inspection Checklist
This central inverter annual service and inspection checklist ensures compliance with NEC Article 690 PV system requirements, NFPA 70E electrical safety standards, IEC 62477-1 (Safety Requirements for Power Electronic Converter Systems), OEM annual service specifications, and arc flash hazard analysis requirements. Designed for qualified solar electrical technicians to perform comprehensive annual service on central inverters (500 kW - 4+ MW) including cooling systems, capacitor inspection, tran
- Industry: Renewable Energy
- Frequency: Annually
- Estimated Time: Full day per inverter
- Role: Qualified Solar Electrical Technician / Inverter Specialist
- Total Items: 30
- Compliance: NEC Article 690 Solar Photovoltaic Systems, NFPA 70E Electrical Safety in the Workplace, IEC 62477-1 Safety Requirements for Power Electronic Converters, OEM Annual Inverter Service Manual Requirements, OSHA 29 CFR 1910.147 Lockout/Tagout
Isolation and LOTO
Safe isolation before service.
- All DC string inputs isolated and LOTO applied?
- AC output circuit breaker locked open?
- DC bus capacitors fully discharged (per OEM discharge time)?
- Zero voltage verified with rated volt meter?
- Arc flash PPE per hazard label worn?
Power Electronics Inspection
IGBT modules, capacitors, and power section.
- IGBT modules visually inspected for burn marks or damage?
- DC bus capacitors inspected for bulging or electrolyte leakage?
- Thermal interface material (TIM) replaced per OEM schedule?
- Heatsinks clean and fins not damaged or clogged?
- Power Section Inspection Photo
Cooling System
Forced air or liquid cooling service.
- All cooling fans operational at correct RPM?
- Air intake filters cleaned or replaced?
- Airflow through inverter cabinet unobstructed?
- Liquid coolant level and quality within limits (if liquid-cooled)?
- Temperature sensors reading correctly?
Step-Up Transformer (if integrated)
Integrated transformer annual service.
- Transformer oil level normal?
- Transformer windings cleaned (blown out with compressed air)?
- Transformer HV and LV bushings clean and undamaged?
- Transformer temperature within rated limits?
- Dry-type transformer free of dust accumulation on windings?
Controls and Protection Testing
Control system and protection function testing.
- Inverter firmware at latest OEM-approved version?
- Protection relay/inverter trip settings verified?
- Anti-islanding function tested?
- Reactive power (VAR) capability tested?
- SCADA communication restored and data quality verified?
Service Completion
Return to service and documentation.
- All connection points re-torqued per OEM spec?
- Inverter restarted, synced to grid, and producing?
- Post-service efficiency within 0.5% of pre-service baseline?
- OEM annual service documentation completed?
- Annual Service Notes
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Why Use This Central Inverter Annual Service and Inspection Checklist?
This central inverter annual service and inspection checklist helps renewable energy teams maintain compliance and operational excellence. Designed for qualified solar electrical technician / inverter specialist professionals, this checklist covers 30 critical inspection points across 6 sections. Recommended frequency: annually.
Ensures compliance with NEC Article 690 Solar Photovoltaic Systems, NFPA 70E Electrical Safety in the Workplace, IEC 62477-1 Safety Requirements for Power Electronic Converters, OEM Annual Inverter Service Manual Requirements, OSHA 29 CFR 1910.147 Lockout/Tagout. Regulatory-aligned for audit readiness and inspection documentation.
Frequently Asked Questions
What does the Central Inverter Annual Service and Inspection Checklist cover?
This checklist covers 30 inspection items across 6 sections: Isolation and LOTO, Power Electronics Inspection, Cooling System, Step-Up Transformer (if integrated), Controls and Protection Testing, Service Completion. It is designed for renewable energy operations and compliance.
How often should this checklist be completed?
This checklist should be completed annually. Each completion takes approximately Full day per inverter.
Who should use this Central Inverter Annual Service and Inspection Checklist?
This checklist is designed for Qualified Solar Electrical Technician / Inverter Specialist professionals in the renewable energy industry. It can be used for self-assessments, team audits, and regulatory compliance documentation.
Can I download this checklist as a PDF?
Yes, this checklist is available as a free PDF download. You can also use it digitally in the POPProbe mobile app for real-time data capture, photo documentation, and automatic reporting.