SMA Inverter Error Code 3903
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SMA error 3903: Generator voltage too high
SMA inverter error code 3903 usually means the PV array voltage is too high for the inverter to meet its DC start conditions. When this happens, the inverter may wait, reduce operation or stop feeding power until conditions return to a safe operating range.
This is not always an internal inverter fault, but it should be taken seriously if it keeps appearing.
High PV array voltage can sometimes occur due to cold-weather voltage rise, incorrect string configuration, too many panels connected in series, inverter input limits or another issue affecting the DC side of the solar system.
Let e-Solar check your inverter and DC voltage
If the code appears once and clears by itself, your inverter may simply be waiting for DC conditions to return to a safe operating range.
If SMA error code 3903 keeps returning, it is worth having the system checked. Our Perth-based solar team can inspect the inverter, review the PV array configuration and help determine whether the issue is linked to high DC voltage, string design, panel configuration, DC cabling or inverter input limits.
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, disconnect DC cabling or inspect rooftop panels yourself. High-voltage DC solar systems can remain dangerous even when the inverter is turned off. If the issue is persistent, a qualified technician may need to test DC voltage levels, review the solar array and confirm the system is safe to operate.
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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SMA 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 SMA inverter models. If your inverter is showing error code 3903, 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 SMA inverter support backed by local experience, honest advice and long-term solar care.