What to do if Sunways STT-4KTL shows Mains Lost?
If your Sunways Inverter displays a 'Mains Lost' error, first verify whether there is a grid power outage. Also, check the AC switch or circuit to ensure they are properly connected. Next, check the AC breaker and terminals to ensure they are well connected.
Why is my Sunways STT-4KTL showing a Grid Voltage Fault?
If your Sunways Inverter is showing a 'Grid Voltage Fault', it means the grid voltage is either too high or too low, exceeding the set protection value. Check if the safety regulation setting is correct. Examine the grid voltage, and if it's outside the inverter's protection parameter range, contact your local grid company. Also, see whether the impendence of the AC cable is too high and replace it with a thicker AC cable if necessary.
How to fix Sunways STT-4KTL Over Temperature error?
If your Sunways Inverter is showing 'Inverter Over Temperature', it means the internal temperature is too high. Check to see if the inverter is in direct sunlight. You may also need to reduce the ambient temperature around the inverter.
How to resolve PV Over Voltage on Sunways Inverter?
If your Sunways Inverter is showing 'PV Over Voltage', it means the input voltage is too high. Reduce the number of PV panels to ensure the open-circuit voltage of each string is lower than the inverter's maximum allowed input voltage.
What does GFCI Fault mean on Sunways STT-4KTL Inverter?
If your Sunways Inverter displays a 'GFCI Fault', it indicates excessive leakage current, meaning the ground current is too high. Check whether the PV cable has a short circuit to ground.
How to fix ISO Over Limitation on Sunways STT-4KTL Inverter?
If your Sunways Inverter is displaying 'ISO Over Limitation', this usually indicates low system insulation resistance, often due to poor insulation of the module or cable, or a rainy environment. Check the PV panels, cables, and connectors for any damage or water leaks. Also, check for a reliable inverter grounding line.
What to do if Sunways STT-4KTL Inverter shows DCI Fault?
If your Sunways Inverter displays a 'DCI Fault', try restarting the inverter and wait for it to recover. The fault indicates that the inverter detects a higher DC component in AC output. If the fault happens repeatedly, contact Sunways.
How to troubleshoot Sunways Inverter with no display?
If there is no display on your Sunways Inverter, check whether all cables are firmly connected and the DC switch is on. Also, check whether the input voltage meets the working voltage.
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