Growatt Inverter Error Code 307
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Growatt error 307: Communication error, M3 did not receive SP-CT
Growatt error code 307 usually means the inverter has detected a communication fault between the inverter and the SP-CT connection. The inverter is unable to receive the expected signal or data from the CT monitoring device.
When this happens, your inverter may not monitor power flow correctly. Depending on your system setup, this can affect export control, monitoring accuracy, battery operation or overall system performance.
This type of fault may be linked to a loose communication cable, damaged wiring, incorrect CT installation, inverter configuration issue or another communication problem within the system.
Book a solar inverter check with e-Solar
If Growatt error code 307 appears after installation work, switchboard changes, battery upgrades or inverter servicing, the communication wiring may need to be checked.
If the code keeps returning, your monitoring data looks incorrect, or your system is not operating normally, it is worth having the system checked. Our Perth solar experts can inspect the inverter, review the communication wiring and help determine whether the issue is linked to the SP-CT connection, CT setup, inverter settings or another system fault.
Contact e-Solar and let us know:
- The exact error code on the screen or app
- When the code appears
- Whether your solar production has dropped
- Your inverter model, if you know it
Do not open the inverter, switchboard or communication wiring yourself. If the issue is persistent, a qualified technician may need to inspect the communication cable, test the CT connection and confirm the inverter is communicating correctly with the monitoring system.
Get In Touch Today
Not sure what the error code means? Send us a quick message with a photo of your inverter screen. We’ll help identify the issue and guide you towards the safest next step.
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Growatt Inverter Repairs and Fault Support
We understand that every solar system is different, which is why our repair and fault-finding services cover a wide range of Growatt inverter models. If your inverter is showing error code 307, our experienced technicians can help determine whether the issue is linked to grid voltage, inverter settings, site wiring or wider network conditions.
With over 22 years supporting Perth solar systems, e-Solar has seen all kinds of inverter faults and performance issues. We’ll assess your system safely, explain what the code means, and recommend the right next step to help get your solar running properly again.
Trust e-Solar for reliable Growatt inverter support backed by local experience, honest advice and long-term solar care.