Huawei SUN2000-3KTL-M1 Series User Manual

E Locating Insulation Resistance Faults
If the ground resistance of a PV string connected to a solar inverter is too low, the
solar inverter generates a Low Insulation Resistance alarm.
To locate the fault, connect each PV string to a solar inverter, power on and check
the solar inverter, and locate the fault based on the alarm information reported by
the FusionSolar App. If a system is not congured with any optimizer, skip the
corresponding operations. Perform the following steps to locate an insulation
resistance fault.
NO TICE
If two or more ground insulation faults occur in a single PV string, the following
method cannot locate the fault. You need to check the PV modules one by one.
Step 1 The AC power supply is connected, and set the DC switch at the bottom of the
solar inverter to OFF. If the solar inverter connects to batteries, wait for 1 minute,
and turn o the battery switch and then the auxiliary power switch of the battery.
Step 2 Connect each PV string to the solar inverter and set the DC switch to ON. If the
solar inverter status is Shutdown: Command, choose Device Commissioning >
Maintenance > Inverter ON/OFF on the App and send a startup command.
Step 3 Log in to the FusionSolar App and choose My > Device Commissioning. On the
Device Commissioning screen, connect and log in to the solar inverter, and access
the Alarm management screen. Check whether the Low Insulation Resistance
alarm is reported.
● If the Low Insulation Resistance alarm is not reported one minute after the
DC is supplied, choose Device Commissioning > Maintenance > Inverter
ON/OFF on the App and send a shutdown command. Set the DC switch to
OFF and go to Step 2 to connect another PV string to the solar inverter for a
check.
● If a Low Insulation Resistance alarm is still reported one minute after the
DC is supplied, check the percentage for possible short-circuit positions on the
Alarm details page and go to Step 4.
SUN2000-(3KTL-10KTL)-M1 Series
User Manual E Locating Insulation Resistance Faults
Issue 17 (2024-01-12) Copyright © Huawei Technologies Co., Ltd. 128

Huawei SUN2000-3KTL-M1 Series Specifications

General

Max. efficiency	98.4%
European efficiency	97.8%
Rated AC output power	3000 W
Dimensions (W x H x D)	365 x 365 x 156 mm
Operating temperature range	-25°C to +60°C
Topology	Transformerless
Protection Degree	IP65
Number of MPP Trackers	2
Output Frequency	50 Hz / 60 Hz
Cooling Method	Natural Convection
Max. DC Power	4500 W
Max. Input Current	11 A
Power Factor	0.8 leading - 0.8 lagging
Max. apparent power	3300 VA
AC output voltage	220 V / 230 V / 240 V