Huawei SUN2000 Series

A major fault caused by excessive PV string output voltage, where the open-circuit voltage of the PV string exceeds the maximum operating voltage of the SUN2000. This can damage the inverter's DC input stage and prevents power generation.

A warning indicating that PV string 1 is performing abnormally, possibly due to long-term shielding or deterioration. This results in reduced power output from the specific string, decreasing overall system efficiency.

A warning indicating that PV string 2 is performing abnormally, possibly due to long-term shielding or deterioration. This results in reduced power output from the specific string, decreasing overall system efficiency.

A warning indicating that PV string 3 is performing abnormally, possibly due to long-term shielding or deterioration. This results in reduced power output from the specific string, decreasing overall system efficiency.

A warning indicating that PV string 4 is performing abnormally, possibly due to long-term shielding or deterioration. This results in reduced power output from the specific string, decreasing overall system efficiency.

A warning indicating that PV string 5 is performing abnormally, possibly due to long-term shielding or deterioration. This results in reduced power output from the specific string, decreasing overall system efficiency.

A warning indicating that PV string 6 is performing abnormally, possibly due to long-term shielding or deterioration. This results in reduced power output from the specific string, decreasing overall system efficiency.

A warning indicating that the cables for PV string 1 were connected in reverse during the SUN2000 installation. This incorrect polarity can prevent power generation from this string or cause damage to the inverter if not corrected.

A warning indicating that the cables for PV string 2 were connected in reverse during the SUN2000 installation. This incorrect polarity can prevent power generation from this string or cause damage to the inverter if not corrected.

A warning indicating that the cables for PV string 3 were connected in reverse during the SUN2000 installation. This incorrect polarity can prevent power generation from this string or cause damage to the inverter if not corrected.

A warning indicating that the cables for PV string 4 were connected in reverse during the SUN2000 installation. This incorrect polarity can prevent power generation from this string or cause damage to the inverter if not corrected.

A warning indicating that the cables for PV string 5 were connected in reverse during the SUN2000 installation. This incorrect polarity can prevent power generation from this string or cause damage to the inverter if not corrected.

A warning indicating that the cables for PV string 6 were connected in reverse during the SUN2000 installation. This incorrect polarity can prevent power generation from this string or cause damage to the inverter if not corrected.

A major fault where abnormal external conditions have triggered DC circuit protection inside the SUN2000, causing issues with the internal DC bus voltage. This can be due to sudden input disconnection, sharp changes in grid voltage, or grid phase imbalances, leading to inverter shutdown.

A major fault where abnormal external conditions have triggered protection in the SUN2000's converter circuit. This can be due to grid voltage drops, short circuits causing high output current, or abnormal grid frequency, leading to inverter shutdown.

A major fault indicating that the connected grid voltage is outside the allowed range, or there is a large difference in voltage among the three phases, or a power outage/AC line disconnection. This prevents grid synchronization and power export, leading to inverter shutdown.

A major fault indicating that the actual frequency of the connected power grid is outside the required range for the local grid. This can prevent the SUN2000 from synchronizing and feeding power, leading to shutdown.

A major fault where the insulation resistance of the PV strings against ground is low, potentially due to a short circuit between strings and ground or installation in a permanently moist environment. This poses a safety risk and can lead to inverter shutdown.

A major fault indicating that the insulation resistance against ground on the input side of the SUN2000 has decreased during operation, leading to an excessively high residual current. This implies a potential ground fault or insulation breakdown, causing inverter shutdown.

A major fault indicating that the internal temperature of the SUN2000 cabinet is too high, potentially due to poor ventilation, high ambient temperature, or a malfunctioning internal fan. This can lead to reduced performance, shutdown, or damage to internal components.

A major fault indicating that the neutral wire or PGND cable is not connected to the SUN2000, or an isolation transformer is missing at the output side when PV strings are grounded. This prevents proper electrical grounding of the inverter, posing a safety risk and operational instability.

A major, unrecoverable fault has occurred on an internal circuit within the SUN2000. This indicates a serious internal hardware or software issue that prevents normal operation.

A minor fault where the internal communication circuit of the SUN2000 is interrupted or damaged, or its internal communication address is incorrectly set. This affects data exchange within the inverter, but the SUN2000 may still feed electricity.

A minor fault indicating that the software version loaded during a software upgrade is incorrect. This can lead to improper inverter operation or functionality issues, but the SUN2000 may still feed electricity.

A major fault indicating that a firmware upgrade process was incomplete, which can leave the SUN2000 in an inoperable state. The inverter cannot function correctly without a complete and valid firmware.

The PV array is not properly configured, with too many PV modules connected in series, causing the PV string open-circuit voltage to exceed the maximum SUN2000 operating voltage. This can damage the inverter.

Arcing or poor contact exists in the PV string power cables for PV strings 1 and 2 (Cause ID 1) or PV strings 3 and 4 (Cause ID 2). This indicates an electrical safety hazard.

Arcing or poor contact exists in the PV string power cables for PV1 (Cause ID 1) or PV2 (Cause ID 2). This indicates an electrical safety hazard.

The polarity of a PV string connected to the SUN2000 is reversed. This can cause the inverter to stop generating power and potentially damage internal components if not corrected.

A PV string has a lower end voltage compared to other strings, often due to an insufficient number of series-connected modules or shading. This can lead to current flowing back into the string, reducing overall system efficiency.

The voltage between the input PV string and the ground is abnormal, posing a risk of power attenuation. This Major alarm can be related to PID compensation settings, device faults, or inconsistent compensation directions between the solar inverter and any PID device.

This alarm indicates an abnormal PV string status where a single PV string is lost, both 2-in-1 PV strings are lost, or one of the 2-in-1 PV strings is lost. This suggests a disconnection or fault in the PV string terminals or inverter terminals.

The Arc Fault Circuit Interrupter (AFCI) self-check function fails. This indicates a potential malfunction of a critical safety feature designed to detect and mitigate electrical arcs.

The impedance of the inverter's output phase wire is low, or it is short-circuited to the Protective Earth (PE) conductor. This fault indicates a ground fault in the AC output wiring, posing safety risks and preventing grid-tied operation.

The power grid is experiencing an outage, or the AC circuit between the SUN2000 and the grid is disconnected or the AC switch is off. This prevents the inverter from exporting power to the grid.

The power grid voltage has dropped below the lower threshold, or the undervoltage duration has exceeded the value specified by LVRT (Low Voltage Ride Through). This condition indicates an unstable or insufficient grid supply.

The grid voltage exceeds the upper threshold or the high voltage duration has lasted for more than the value specified by high voltage ride-through (HVRT). This indicates an unstable or excessively high grid voltage.

The difference between grid phase voltages exceeds the upper threshold. This indicates an imbalance in the three-phase power grid, which can affect the inverter's stable operation.

The actual power grid frequency is higher than the requirements for the local power grid code. This indicates an exception in the power grid's frequency stability.

The actual power grid frequency is lower than the standard requirement for the local power grid. This condition indicates an unstable grid frequency, which can cause the inverter to disconnect for protection.

The power grid frequency's actual change rate does not meet the requirements of the local power grid code. This can indicate temporary power grid abnormalities or a persistent issue with grid frequency stability.

The SUN2000's transient output current exceeds its upper threshold, triggering protection, typically due to a dramatic drop in grid voltage or a short circuit in the power grid. This protects the inverter from excessive current.

The DC component in the power grid current exceeds the upper threshold. This indicates an issue with the quality of the current being fed into the grid.

The input-to-ground insulation impedance has decreased during the SUN2000 operation. This typically indicates an insulation fault or a temporary issue with external power cabling.

The N (Neutral) cable or ground cable is not properly connected, or if a PV array is grounded, the inverter output is not connected to an isolation transformer. This indicates a potential safety hazard due to incorrect grounding.

PV arrays are short-circuited with PE, or the ambient air around the PV array is damp, leading to poor insulation between the PV array and the ground. This presents a safety risk and can hinder inverter operation.

The SUN2000 is operating at an excessively high temperature, potentially due to poor ventilation at the installation site, high ambient temperature, or an internal malfunction. This can lead to reduced performance or damage.

An unrecoverable fault has occurred on an internal circuit of the SUN2000. This indicates a critical internal hardware or software issue that prevents normal operation.

The firmware upgrade process did not complete normally, or there is a mismatch in software versions. This prevents the inverter from functioning correctly after an attempted upgrade.

The privilege certificate for the SUN2000 has entered its grace period or the privilege feature is about to become invalid. This indicates an impending loss of certain functionalities due to license expiration.

The communication with the power meter (power collector) is interrupted. This means the inverter cannot receive data from or send commands to the power meter, impacting energy management and monitoring.

The inverter detects that the phase voltage exceeds the transient AC overvoltage protection threshold. This indicates a sudden, temporary spike in the AC grid voltage.

An optimizer is offline or faulty, preventing proper operation of the PV string optimization. This can lead to reduced power output from the affected strings.

The inverter fails to communicate with the Smart Backup Box or an unrecoverable fault occurs on a circuit inside the Smart Backup Box. This impacts the inverter's ability to operate in grid-tied or off-grid modes.

This Minor alarm indicates an issue with the built-in Potential Induced Degradation (PID) operation. It can be caused by low output resistance of PV arrays to ground or low system insulation resistance, affecting the compensation function.

An external fan (FAN 1-3) is experiencing an abnormality such as a short circuit, insufficient power supply, or a blocked air channel. This Major alarm indicates inadequate cooling for the inverter, which can lead to overheating.

The internal fan is experiencing an abnormality, such as a short circuit, insufficient power supply, or physical damage. This Major alarm indicates a critical cooling issue within the inverter, which could lead to overheating and damage.

This Major alarm indicates an issue with the DC protection unit. Possible causes include a fuse not being in position or blown, open-circuited relays on the breaking board, or stuck DC switch contact points. The specific action depends on the cause ID and PV indicator status.

This Minor alarm indicates that a DC switch is not in the ON position, or its reset button is not fully pressed down. This prevents the proper closing of the DC circuit, affecting inverter operation.

A minor fault indicating an issue with the flash drive, either due to insufficient space, bad blocks, or general faultiness. This affects the storage and retrieval of data on the monitoring board, but the SUN2000 may still feed electricity.

This alarm is reported when the DC input is on but the AC output is off. The SUN2000 cannot operate in grid-tied mode under these conditions.

This alarm indicates that the insulation resistance of a PV string is low, suggesting a potential short-circuit. The inverter provides a percentage for the possible short-circuit position, with 0% representing the PV- terminal and 100% representing the PV+ terminal. Other percentages indicate a fault on a PV module or cable within the PV string, with a detection precision of ±1 PV module.

The DC SWITCH has automatically turned off, signaling an event where current is flowing back into the PV strings from the inverter or another source. This condition can indicate an internal fault within the inverter or an external wiring issue that could damage the PV array or the SUN2000 inverter.

This alarm indicates that the DC SWITCH has automatically turned off due to a detected reverse polarity connection of the PV strings. Incorrect string connections can lead to improper power generation, reduced efficiency, and potential damage to the SUN2000 inverter or PV modules.

This alarm indicates that the DC SWITCH has automatically turned off because the voltage of one or more PV strings has exceeded the maximum allowable input voltage for the SUN2000 inverter. Sustained overvoltage can lead to critical component failure, permanent damage to the inverter, and safety hazards.