Growatt Inverter Error Code 306
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Growatt error 306: CT LN reversed
Growatt error code 306 usually means the inverter has detected an issue with the CT connection, often described as CT LN reversed. CT refers to the current transformer, which helps the inverter monitor energy flow through the system.
When this happens, your inverter may not measure power flow correctly. This can affect system monitoring, export control, battery behaviour or inverter operation, depending on your system setup.
This type of fault may be linked to incorrect CT wiring, reversed line and neutral connections, communication issues, installation changes, switchboard work or a faulty CT connection.
Book a solar inverter check with e-Solar
If Growatt error code 306 appears after installation, inverter replacement, battery work or switchboard changes, it may indicate that the CT connection needs 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-based solar team can inspect the inverter, review the CT connection and help determine whether the issue is linked to CT wiring, line and neutral orientation, 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 CT wiring yourself. If the issue is persistent, a qualified technician may need to inspect the SP-CT connection, test system monitoring and confirm the inverter is reading power flow correctly.
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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 306, 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.
e-Solar supplies and supports a wide range of Growatt inverter systems across Perth, including hybrid and battery-ready models:
- Growatt MIN 5000TL-XH Grid Inverter
- Growatt MOD 5000TL3-X Grid Inverter
- Growatt SPH 5000 Grid Inverter (hybrid)
Trust e-Solar for reliable Growatt inverter support backed by local experience, honest advice and long-term solar care.