INVERTER CHECK
At the heart of solar power - Professional inverter maintenance
Preventive maintenance of inverters in PV (photovoltaic) parks is critical, since the inverter is the “heart” of the system—converting DC from solar panels into usable AC and directly affecting energy yield and system reliability.
Here are the key preventive maintenance checks we typically carried out:
1. Visual Inspection
• Check for damage: Cracks, corrosion, or discoloration on the housing.
• Connections: Inspect cables, terminations, and grounding for looseness, oxidation, or overheating marks.
• Environment: Ensure ventilation openings are free of dust, debris, nests, or vegetation.
• Weather protection: Verify seals, gaskets, and covers are intact against moisture ingress.
2. Electrical Checks
• Tightness of connections: Torque test on AC/DC terminals to prevent hot spots.
• Insulation resistance: Test between DC cables and ground to detect insulation degradation.
• Earth continuity: Confirm effective grounding to avoid safety and performance issues.
• Thermal scans: Use infrared cameras to detect abnormal heating on busbars or connectors.
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3. Operational Monitoring
• Error logs: Retrieve and analyze event/error codes stored in the inverter.
• Performance ratios: Compare actual inverter output against expected performance curves.
• Synchronization: Check inverter grid synchronization and protective relay settings.
• Firmware: Verify software/firmware is updated with manufacturer’s latest version.
4. Cooling System Maintenance
• Air filters: Clean or replace intake filters.
• Fans: Inspect and test operation; replace if noisy, dirty, or nearing end of life.
• Liquid cooling (if applicable): Check coolant levels, leaks, and pump function.
5. Safety & Compliance
• Protective devices: Test fuses, surge protection devices (SPDs), and circuit breakers.
• Emergency stop: Confirm that shutdown buttons and remote stop functions operate correctly.
• Arc fault & anti-islanding protection: Perform functional tests if required by local standards.
6. Documentation
• Maintain detailed logs of inspections, measurements, firmware updates, and
corrective actions.
• Compare current readings with historical data to detect early degradation trends.
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