Huawei SUN2000-(3KTL-10KTL)-M1 Solar Inverter

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 the PV string is reversed (PV1 for Cause ID 1, PV2 for Cause ID 2). This prevents proper power generation and can potentially damage the inverter.

The number of PV modules connected in series to the PV string is insufficient, resulting in a lower end voltage compared to other parallel strings. This can lead to inefficient operation or potential current backfeed issues.

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 output phase wire to PE (Protective Earth) is low or the output phase wire is short-circuited to PE. This is a serious electrical safety fault indicating a direct connection between a phase conductor and ground.

A power grid outage has occurred, or the AC circuit is disconnected or the AC switch is off. This prevents the inverter from feeding power to the grid.

The grid voltage is below the lower threshold or the low-voltage duration has lasted for more than the value specified by low voltage ride-through (LVRT). This indicates an unstable or insufficient grid voltage.

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 requirements for the local power grid code. This indicates an exception in the power grid's frequency stability.

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 due to a dramatic drop in power grid voltage or a short-circuited power grid. This indicates an external electrical fault affecting the inverter's output.

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.

A short circuit exists between the PV array and the ground, or the PV array is in a moist environment with poor insulation. This is a critical safety fault indicating potential electrical leakage.

The SUN2000's cabinet temperature exceeds the upper threshold due to poor ventilation, high ambient temperature, or an internal operational issue. This can lead to reduced performance and equipment damage.

An unrecoverable fault has occurred on a circuit inside the SUN2000, indicating an internal hardware issue. This requires a reset or professional intervention.

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 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.