Electrical Connection Faults: Loose terminals, poor contact, or cable breakage are frequent issues. Symptoms include fluctuating voltage or current, scorching, or discoloration at connection points. Causes include thermal cycling, vibration, aging cables, corrosion, or improper installation . Fuse and Circuit Breaker Failures: Overcurrent conditions, mismatched PV modules, or environmental stress can blow fuses or trip breakers. Repeated failures may indicate underlying system problems, such as inverter faults or excessive current in certain strings . Environmental Factors: Exposure to sunlight, rain, wind, dust, or high humidity can degrade insulation, corrode terminals, or allow water ingress. Extreme temperatures can cause overheating or brittleness in plastic housings, while dust and debris can block ventilation and create hot spots . Protective Device Malfunctions: Surge protection devices (SPDs) may fail due to lightning or voltage surges, leaving the system vulnerable. Breakers and fuses can also degrade mechanically or electrically over time . Communication Failures: In monitored PV systems, combiner box communication issues may arise from incorrect baud rates, interference, or faulty wiring to monitoring equipment .
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