SMA SUNNY BOY 5000US-8000US Solar Inverter

Communication between the BFR (Betriebsführungsrechner - Sequential Control System) and SRR (Stromregelungsrechner - Current Control System) micro-controllers is failing in the Sunny Boy SB50US-80US-IUS094030. This indicates an internal communication problem within the inverter.

The Sunny Boy SB50US-80US-IUS094030 inverter is reducing its output power because its internal temperature is too high. This protective measure prevents damage to internal components and typically occurs when the ambient temperature exceeds 45°C.

A transition failure occurred during the reading or writing of non-essential data in the EEPROM of the Sunny Boy SB50US-80US-IUS094030. This issue does not impact the inverter's performance or its safe operation.

The data EEPROM within the Sunny Boy SB50US-80US-IUS094030 is defective, leading to data loss that affects critical inverter functions. As a result, the device is set to a permanent disable state for safety.

The earth current between the PV+ conductor and ground (GND), monitored by the BFR (Betriebsführungsrechner), has exceeded its acceptable operating range in the Sunny Boy SB50US-80US-IUS094030. This indicates a ground fault in the PV array. The inverter will disconnect from the grid.

The earth current between the PV+ conductor and ground (GND), monitored by the SRR (Stromregelungsrechner), has exceeded its acceptable operating range in the Sunny Boy SB50US-80US-IUS094030. This indicates a ground fault in the PV array. The inverter will disconnect from the grid.

An unspecified internal failure has occurred within the Sunny Boy SB50US-80US-IUS094030 inverter.

The AC grid frequency has exceeded or fallen below the allowable operating range for the Sunny Boy SB50US-80US-IUS094030. The inverter interprets this as a public grid outage and disconnects from the grid to prevent islanding. 'Bfr' and 'Srr' are internal processor messages.

The Ground Fault Detection and Interruption (GFDI) fuse, located in the fuse holder on the circuit board of the Sunny Boy SB50US-80US-IUS094030, has cleared or is not present. This fuse is critical for protecting the PV system in the event of an array ground fault.

The Sunny Boy SB50US-80US-IUS094030 inverter failed to detect the type of connected grid (208V, 240V, or 277V). This can be caused by incorrect wiring, especially when connecting to specific grid types.

The current being fed to the AC grid by the Sunny Boy SB50US-80US-IUS094030 exceeds the specified maximum limit. This condition may be triggered by harmful interference or abnormal load conditions on the grid.

An internal self-test for a relay (K1) within the Sunny Boy SB50US-80US-IUS094030 inverter has failed. This indicates a potential malfunction of the relay or its control circuit.

An internal measurement comparison error has occurred in the Sunny Boy SB50US-80US-IUS094030, indicating a significant discrepancy between the values measured by the BFR (Betriebsführungsrechner) and SRR (Stromregelungsrechner) processors. This suggests an inconsistency in internal data acquisition related to frequency (FAC) or differential current (Idif).

The internal self-test for the grid monitoring system has failed in the Sunny Boy SB50US-80US-IUS094030. This system is crucial for ensuring safe and compliant grid interconnection. This is distinct from the startup offset calibration.

The internal self-test of the Sunny Boy SB50US-80US-IUS094030's control system firmware (ROM) has failed. This indicates a potential issue with the integrity or functionality of the inverter's embedded software.

The Sunny Boy SB50US-80US-IUS094030 has detected a continuous internal overcurrent condition and has initiated a shutdown to protect its components from damage.

The AC grid voltage has exceeded or fallen below the allowable operating range for the Sunny Boy SB50US-80US-IUS094030. This can also be caused by a disconnected grid or a disconnected AC cable. The inverter assumes a public grid outage and disconnects to prevent islanding. 'Bfr' and 'Srr' are internal processor messages.

The voltage measured on a specific AC grid leg (L1 or L2) is either too high or too low for the Sunny Boy SB50US-80US-IUS094030, indicating an imbalance or out-of-tolerance condition on that particular phase. 'Bfr' and 'Srr' are internal processor messages.

The DC input voltage supplied from the PV array has surpassed the maximum tolerable value for the Sunny Boy SB50US-80US-IUS094030 inverter. This condition can lead to component damage if not addressed immediately.

The internal watchdog timer, which monitors the Sunny Boy SB50US-80US-IUS094030's operation control system for anomalies, has been triggered. This usually indicates a system freeze or an unexpected software execution path.

The Sunny Boy SB50US-80US-IUS094030's internal transformer is incorrectly connected or configured for the present grid type. This issue can manifest in Delta corner-grounded grids if the grid ground is not connected to terminal L2, or in unbalanced 208V/240V grids if L1 and L2 are interchanged.

The internal transformer of the Sunny Boy SB50US-80US-IUS094030 has reached an excessively high temperature, causing the inverter to cease operation. The cooling fans will automatically activate and run at maximum speed to reduce the temperature.

This warning indicates that a previous condition of high transformer temperature in the Sunny Boy SB50US-80US-IUS094030 has subsided, and the inverter has resumed operation. It serves as an alert to investigate the cooling system to prevent recurrence.