Huawei SUN2000 Solar Inverter

The open-circuit voltage of the PV array exceeds the maximum input voltage limit of the SUN2000 due to an excessive number of PV modules connected in series. This indicates a potential overvoltage condition for the inverter's DC input.

An electrical arc has occurred in the PV string power cable, or there is poor contact within the DC wiring. This fault can lead to significant energy loss, equipment damage, and fire hazards.

The PV string power cables are arcing or have poor contact. This is a Major alarm indicating a potentially dangerous electrical fault in the DC circuit, requiring immediate inspection and rectification of the cable connections.

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 within the solar inverter has failed. This indicates a potential issue with the arc detection capabilities of the device, which are critical for safety in PV systems.

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 power grid voltage has exceeded the upper threshold, or the overvoltage duration has exceeded the value specified by HVRT (High Voltage Ride Through). This indicates an unstable or excessively high grid supply.

The difference between grid phase voltages exceeds a specified upper threshold. This indicates an imbalance in the three-phase power supply, which can affect inverter operation and grid stability.

The actual power grid frequency is higher 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 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 actual grid frequency change rate does not comply with the local power grid standard. This indicates rapid fluctuations in grid frequency, which can compromise grid stability and inverter operation.

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 of the SUN2000 output current exceeds the specified upper threshold. An excessive DC component can cause transformer saturation in the grid and affect other grid-tied equipment.

The insulation impedance of the input (DC) side to PE (Protective Earth) decreases while the SUN2000 is operating. This indicates a potential insulation breakdown or ground fault on the PV side, posing a safety risk.

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.

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.

The monitoring unit has an issue, possibly due to insufficient flash memory or bad sectors in the flash memory. This can affect the inverter's ability to monitor and log data.