Not All Optimizers Found In The Single-Inverter Scenario; Impedance Is Abnormal (R1 Is Much Greater Than N1) - Huawei SUN2000-450W Series Troubleshooting Manual

SUN2000-450W and SUN2000-600W-P Series
Troubleshooting Guide
Solution: Replace the inverter and search again.

3.3 Not All Optimizers Found in the Single-Inverter Scenario

3.3.1 Impedance Is Abnormal (R1 Is Much Greater Than N1)

Symptom: Not all optimizers are found. The measured PV string impedance on the inverter
side does not match the actual number of optimizers (the impedance is high).
Cause 1: An anti-reverse diode or SPD is installed between the PV modules and the PV
terminals of the inverter.
Solution: Bypass the anti-reverse diode and search again.
Cause 2: A safety box is installed between the PV modules and the PV terminals of the
inverter, but the upstream or downstream terminals of the safety box are in poor contact.
Issue 01 (2024-1-2) Copyright © Huawei Technologies Co., Ltd..
3 Troubleshooting
9