Impedance Is Normal, But Not All Optimizers Are Found - Huawei SUN2000-450W Series Troubleshooting Manual

Table of Contents

SUN2000-450W and SUN2000-600W-P Series

Troubleshooting Guide

Terminal crimping video: https://support.huawei.com/enterprise/en/fusionsolar/sun2000p-

pid-22098206

Cause 4: The input cables of the optimizers that are not found are incorrectly connected.

Solution: Locate the installation position of an optimizer that is not found based on the

optimizer physical layout diagram and the SNs of optimizers found, and check whether the

input cable of the optimizer not found is correctly connected to the PV module.

Cause 5: A disconnection exists in the PV string (poor contact between the outputs of

adjacent optimizers or in extension cable terminals).

Solution: Check the core wires in the extension cable terminals between adjacent

optimizers and re-crimp them. Then, search for optimizers again. If the fault persists,

manually check whether a DC cable is disconnected.

Cause 6: The optimizers that are not found are faulty.

Solution: Check the output impedance of an optimizer that is not found. If the output

impedance is not 1 kΩ, the optimizer is faulty and needs to be replaced.

3.3.2 Impedance Is Normal, but Not All Optimizers Are Found

Symptom: Not all optimizers are found, but the measured PV string impedance on the

inverter side matches the number of connected optimizers.

Cause: The terminals of the extension cables between the inverter and optimizers are in

poor contact on the inverter side.

Solution: Check the core wires in the extension cable terminals on the inverter side and re-

crimp them. Then, search for optimizers again.

Issue 01 (2024-1-2)

3 Troubleshooting

Table of Contents

Sun2000-600w-p series