Huawei SUN2000 MB0 Series User Manual

D Locating Insulation Resistance Faults
If the ground impedance of a PV string connected to the inverter is too low, the
inverter generates a Low insulation resistance alarm.
The possible causes are as follows:
● A short circuit has occurred between the PV array and the ground.
● The ambient air of the PV array is damp and the insulation between the PV
array and the ground is poor.
After the Low insulation resistance alarm is reported by the inverter, insulation
resistance fault location is automatically triggered. If the fault location is
successful, the location information is displayed on the Alarm details screen of
the Low insulation resistance alarm on the FusionSolar app.
Log in to the FusionSolar app, choose Alarm > Active alarm, select Low
insulation resistance to enter the Alarm details screen.
Figure D-1 Alarm details
SUN2000-(12K-25K)-MB0 Series
User Manual D Locating Insulation Resistance Faults
Issue 01 (2023-04-30) Copyright © Huawei Digital Power Technologies Co., Ltd. 127

Huawei SUN2000 MB0 Series Specifications

General

Type	String Inverter
Max Input Voltage	1100 V
MPPT Voltage Range	200 V - 1000 V
Number of MPPTs	2
Max Input Current per MPPT	26 A
Rated Output Frequency	50 Hz / 60 Hz
Max Efficiency	98.6%
Operating Temperature Range	-25°C to +60°C
Protection Degree	IP65
Cooling	Natural Convection
Power Factor Adjustment Range	0.8 leading to 0.8 lagging
Cooling Method	Natural Convection
Protection Level	IP65
Model	SUN2000
Rated Output Voltage	230 V / 400 V
Humidity	0% - 100%
Communication	RS485