Solar String Inverter Preventive Maintenance Checklist
This solar string inverter preventive maintenance checklist ensures compliance with manufacturer O&M specifications, NFPA 70E electrical safety in the workplace, NEC Article 690 PV system requirements, and IEC 62446-2 PV system maintenance standards. Designed for solar O&M technicians to perform scheduled preventive maintenance on string inverters to maximize uptime, warranty compliance, and system performance.
- Industry: Renewable Energy
- Frequency: Annually
- Estimated Time: 2-3 hours per inverter
- Role: Solar O&M Technician
- Total Items: 30
- Compliance: IEC 62446-2 PV System Maintenance, NFPA 70E Electrical Safety in the Workplace, NEC Article 690 Solar Photovoltaic Systems, Manufacturer O&M Specifications (SMA, Fronius, SolarEdge, Enphase), OSHA 29 CFR 1910.147 Lockout/Tagout
Lockout/Tagout and Pre-Service
Safe energy isolation before inverter service.
- Lockout/tagout applied to AC and DC disconnects?
- Zero energy verified with calibrated test instrument?
- Arc-rated PPE worn for electrical work?
- Current firmware version documented?
- Error/fault history downloaded from inverter?
Internal Visual Inspection
Inverter interior condition assessment.
- No moisture, corrosion, or condensation inside inverter?
- No pest damage (rodents, insects) inside enclosure?
- Capacitors showing no bulging or electrolyte leakage?
- No burn marks, heat damage, or discoloration on components?
- Internal Condition Photo
Connections and Cleaning
Terminal inspection and inverter cleaning.
- All DC string connections tight and corrosion-free?
- AC output connections tight and properly torqued?
- Ground/bonding connections secure?
- Air intake filters cleaned or replaced?
- Cooling fans operational and clean?
Functional Testing
Performance testing after maintenance.
- Inverter starts up normally after reconnection?
- No fault codes active on startup?
- MPPT tracking functioning (output increasing with irradiance)?
- CEC/Euro weighted efficiency within 1% of nameplate?
- Current AC Output Power (kW)
Communications and Monitoring
Data communication and monitoring verification.
- Inverter communicating with monitoring platform?
- Remote access/service portal functional?
- Internal data logger current and backed up?
- Firmware updated to latest version?
- Alarm and notification test completed?
Service Completion
Documentation and service record update.
- Service record updated with all findings?
- Work performed within warranty terms (no voiding actions)?
- Next PM date scheduled and entered in CMMS?
- Owner/asset manager notified of any issues?
- Service Notes
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Why Use This Solar String Inverter Preventive Maintenance Checklist?
This solar string inverter preventive maintenance checklist helps renewable energy teams maintain compliance and operational excellence. Designed for solar o&m technician professionals, this checklist covers 30 critical inspection points across 6 sections. Recommended frequency: annually.
Ensures compliance with IEC 62446-2 PV System Maintenance, NFPA 70E Electrical Safety in the Workplace, NEC Article 690 Solar Photovoltaic Systems, Manufacturer O&M Specifications (SMA, Fronius, SolarEdge, Enphase), OSHA 29 CFR 1910.147 Lockout/Tagout. Regulatory-aligned for audit readiness and inspection documentation.
Frequently Asked Questions
What does the Solar String Inverter Preventive Maintenance Checklist cover?
This checklist covers 30 inspection items across 6 sections: Lockout/Tagout and Pre-Service, Internal Visual Inspection, Connections and Cleaning, Functional Testing, Communications and Monitoring, 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 2-3 hours per inverter.
Who should use this Solar String Inverter Preventive Maintenance Checklist?
This checklist is designed for Solar O&M Technician 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.