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Janice RamosAug 16, 2025
What to do if the GFDI fuse is open in my SMA SUNNY BOY 4000-US Inverter?
- MMonique BeckAug 16, 2025
If the ground fuse has tripped in your SMA Inverter, check the PV plant for ground-faults and replace the ground fuse.
What to do if the GFDI fuse is open in my SMA SUNNY BOY 4000-US Inverter?
If the ground fuse has tripped in your SMA Inverter, check the PV plant for ground-faults and replace the ground fuse.
How to troubleshoot a red LED glowing on my SMA Inverter?
If the red LED is glowing on your SMA Inverter, it indicates a tripped ground fuse. Check the PV plant for ground-faults.
What does it mean when the red and yellow LEDs are glowing on my SMA SUNNY BOY 4000-US Inverter?
If both the red and yellow LEDs are glowing on your SMA Inverter, it indicates a ground-fault. Check the PV plant for ground-faults.
Why is my SMA Inverter derating?
If your SMA Inverter is derating, meaning it's reducing its output power, it may be due to excess temperature. Clean the fan to resolve this issue.
What does a yellow LED glowing on my SMA SUNNY BOY 4000-US Inverter mean?
If the yellow LED is glowing on your SMA Inverter, it signifies a control system fault. The operation of the inverter is permanently inhibited, and it will no longer feed into the power distribution grid.
What does EarthCurMax-B or EarthCurMax-S mean on my SMA SUNNY BOY 4000-US Inverter?
If your SMA Inverter displays 'EarthCurMax-B' or 'EarthCurMax-S', the ground-fault monitoring has detected an excessive residual current in the PV plant. Check the PV plant for ground-faults.
Why are all the LEDs glowing on my SMA SUNNY BOY 4000-US Inverter?
If all LEDs are glowing on your SMA Inverter, the DC current available from the PV array is not sufficient for normal operation. Data transmission is not possible during initialization.
What does it mean when the yellow LED on my SMA SUNNY BOY 4000-US Inverter glows for 5 seconds, goes out for 3, and blinks twice?
If the yellow LED glows for 5 seconds, goes out for 3 seconds, and then blinks twice on your SMA Inverter, monitor the status of the power distribution grid at the AC connecting terminal plate of the DC Disconnect and the AC miniature circuit-breaker between the inverter and the power distribution grid, as it indicates a grid failure.
Why are all the LEDs not glowing on my SMA Inverter?
If all the LEDs are not glowing on your SMA Inverter, the DC input voltage is too low for operation.
Why is the yellow LED blinking on my SMA Inverter?
If the yellow LED is blinking on your SMA Inverter, the inverter is carrying out the AFCI self-test.
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