SMA Sunny Boy Series

The internal communication between the Sunny Boy's micro-controllers has failed. This is identified as a disturbance message.

The SMA Sunny Boy is reducing its output power because its internal temperature is too high. This is a warning, indicating that the inverter is managing its temperature to prevent damage.

The inverter experienced a failure while reading or writing data to the EEPROM. This data is not critical for safe operation, and the inverter's performance is not affected. This is a disturbance message.

The data EEPROM is defective, which affects important inverter functions. Due to this critical data loss, the device has been permanently disabled.

The inverter has detected that the earth current between the PV positive terminal and ground is outside the acceptable limits. This indicates a ground fault within the PV system.

The SMA Sunny Boy inverter has detected a ground fault in the PV array. This means the current between PV+ and ground is outside the acceptable range. This message appears on the display, and the GFDI fuse may have cleared.

The inverter has detected an internal failure. This is identified as a disturbance message.

The frequency of the AC grid is outside the acceptable operating range. The Sunny Boy assumes the public grid is down and disconnects from the grid to prevent 'islanding'. This is a disturbance message.

The Ground Fault Detection Interruption (GFDI) fuse inside the Sunny Boy is open or has cleared (blown). This fuse is crucial for protecting the PV system in the event of a ground fault. This is a warning message.

The Sunny Boy could not detect the type of AC grid it is connected to (e.g., 208V, 240V, or 277V). This is a disturbance message.

The current flowing to the AC grid has exceeded the specified limits. This is a disturbance message, and it may happen in case of harmful interference on the grid.

An internal test of the K1 relay within the Sunny Boy has failed. This is identified as a disturbance message.

The internal measured values from the BFR and SRR redundant processor control systems are too different from each other, indicating a measurement error within the inverter. This is a disturbance message.

The self-test for the grid monitoring system within the Sunny Boy has failed. This is identified as a disturbance message.

The internal test of the Sunny Boy's control system firmware has failed. This is an error message, indicating a problem with the inverter's core software.

A continuously lit red LED indicates that the Ground Fault Detection Interruption (GFDI) fuse inside the Sunny Boy has either cleared (blown) or is not present. This typically happens due to a ground fault in the PV array.

When both the red and yellow LEDs are lit simultaneously, it signifies that the inverter has detected a ground fault within the PV system. The inverter will not restart automatically until the fault is resolved and the inverter is manually reset.

The Sunny Boy has detected a continuous internal overcurrent condition and has shut down to prevent damage. This is identified as a disturbance message.

The voltage of the AC grid is outside the acceptable operating range for the Sunny Boy. The inverter assumes the public grid is down and disconnects to prevent 'islanding'. This is a disturbance message.

The voltage measured on a specific AC leg (L1 or L2) is either too high or too low, exceeding the allowable range for the Sunny Boy. This is identified as a disturbance message.

The DC input voltage from the PV array has exceeded the maximum tolerable value for the SMA Sunny Boy inverter. This is a critical disturbance message, and immediate action is required.

The SMA Sunny Boy is in 'Waiting' mode, and the green LED is blinking. This indicates that either the PV voltage from the solar array is currently too low to begin normal operation, or an AC fault was detected, causing a 5-minute delay before restarting.

The internal watchdog timer for operation control has been triggered, indicating a potential software or system lock-up within the inverter. This is identified as a disturbance message.

The inverter's internal transformer is configured for or connected to an incorrect type of grid. This is identified as a disturbance message.

The internal transformer has reached a dangerously high temperature, causing the Sunny Boy to stop operating. The fans will automatically run at maximum speed to cool it down. This is identified as a disturbance message.

This message indicates that the transformer temperature was previously high but has now returned to a safe level, allowing the Sunny Boy to resume operation. This is a warning message.

The Sunny Boy inverter has detected that the DC input voltage from your solar panels is too high. This condition can be dangerous and may cause permanent damage to the inverter if not addressed. The LED pattern repeats multiple times.

The yellow LED is continuously lit, specifically indicating a 'Control System Fault' within the Sunny Boy's internal monitoring systems. When this occurs, the inverter will no longer connect to the utility grid.

A continuously lit yellow LED indicates that the SMA Sunny Boy has detected a general fault either within its internal systems or somewhere in the connected PV (photovoltaic) system. The inverter will not operate until this fault is corrected.

This specific blinking pattern of the yellow LED indicates a grid fault condition. The pattern repeats as long as the grid fault persists, meaning the inverter cannot connect to the utility grid.