The fan noise of the photovoltaic inverter is too loud

A noisy inverter cooling fan is a sure sign that the inverter is in distress due to a likely overload. Cooling fans should run quietly, cycle on and off, and not run continuously. [pdf]
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Photovoltaic panel troubleshooting

Troubleshooting PV panelsTrace out the individual branch wiring backward from the concentrator. Check the entire system visually for any obvious damage or accidental disconnections. . Check the combiner box. . Watch for low voltage and check wiring connections. . Test the open circuit voltage (Voc). . Inspect the modules for obstructions. . [pdf]
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Photovoltaic panel troubleshooting cause analysis

Troubleshooting PV panelsTrace out the individual branch wiring backward from the concentrator. Check the entire system visually for any obvious damage or accidental disconnections. . Check the combiner box. . Watch for low voltage and check wiring connections. . Test the open circuit voltage (Voc). . Inspect the modules for obstructions. . [pdf]
[FAQS about Photovoltaic panel troubleshooting cause analysis]