Learn about Growatt Error Code 302, its meaning, causes, and solutions for AC connection issues.
Error Code 302 indicates a missing AC connection, often due to a phase issue. This can prevent the inverter from functioning properly.
Check the AC connections and ensure all phases are properly connected. Inspect the wiring for any damage or loose connections.
Error 302 typically indicates that the inverter has detected a loss of AC connection, which can stem from several electrical anomalies. The inverter continuously monitors the AC input from the utility grid. If it detects an absence of voltage, or if there is a significant phase imbalance, it will trigger this fault to prevent damage to the unit. The inverter's internal logic includes checks for ground faults and insulation resistance (RISO) to ensure safe operation. If these parameters fall outside acceptable limits, the inverter will disable itself to protect both the system and the grid.
Users may observe the inverter display showing error 302, accompanied by a lack of power generation. The LED indicators may blink erratically or remain solid red, and the monitoring app will report a loss of AC connection. Additionally, homeowners may notice that the system is not producing energy, despite optimal sunlight conditions.
Always ensure that a licensed electrician or certified solar installer performs any troubleshooting or repairs to the inverter to maintain safety and compliance with local electrical codes.
Regular maintenance checks should be performed to ensure all connections are secure and that the AC disconnect switch is operational. Periodic inspections of the inverter settings and configurations can help prevent future occurrences of error 302. Additionally, keeping an eye on the utility grid's phase balance can alert technicians to potential issues before they affect the inverter.