Huawei SUN2000 Inverter and Networking Devices Installation and Troubleshooting

2.1 Installation Videos for Inverters

This section provides links to installation videos for various Huawei SUN2000 series inverters.

SUN2000-12/15/17/20KTL-M0/M2 (Three-phase inverter)

Website: https://support.huawei.com/enterprise/en/doc/EDOC1100087197

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SUN2000-29.9KTL/33KTL-A/36KTL (Three-phase inverter)

Website: https://support.huawei.com/enterprise/en/doc/EDOC1100164794/62e14c08

[QR Code]

SUN2000-50/60KTL-M0 (Three-phase inverter)

Website: https://support.huawei.com/enterprise/en/doc/EDOC1100042179

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SUN2000-100KTL-M1 (Three-phase inverter)

Website: https://support.huawei.com/enterprise/en/doc/EDOC1100111807

[QR Code]

Note: Installation methods for SUN2000-8KTL-M0 and SUN2000-10KTL-M0 inverters in Australia are the same as those shown in the videos.

2.2 Installation Videos for Communication Modules

This section provides links to installation videos for communication modules.

Smart Dongle-WLAN-FE

Website: (Q2 2020)

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Smart Dongle-4G

Website: https://support.huawei.com/enterprise/en/doc/EDOC1100118294?section=0002

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SmartLogger3000A

Website: https://support.huawei.com/enterprise/en/doc/EDOC1100133449

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USB-Adapter2000-C

For details, see the inverter installation video.

Document Links for Inverters

This section lists available documentation for various SUN2000 inverter models.

Installation Videos

User Manual

Quick Guide

Document Link for Networking Devices

This section lists available documentation for networking devices.

Commissioning Video

User Manual

Quick Guide

HiKnow App

The HiKnow app helps users find product information and documents.

Method 1: Scan the QR code.

[QR Code]

Method 2: Search for Enterprise Support

Search on the following platforms:

• Android: Huawei AppGallery (https://appstore.huawei.com) or Google Play (https://play.google.com)
• iOS: App Store

Using the HiKnow App

The app guides users through finding documents by selecting products, using keywords in iKnow, and participating in forums.

Key Search Areas:

• Products > Network Energy > FusionSolar PV > SUN2000/SUN2000MA/... > Product Info
• iKnow > Enterprise Network Energy > Enterprise Solar Inverter (use keywords)
• Forums > Enterprise Network Energy > Network Energy > Smart PV

Keywords for searching:

• SUN2000L Technical Data
• SUN2000MA Technical Data
• SUN2000 Technical Data

Example iKnow Search: The app displays results for technical data, cable specifications, and user manuals for various SUN2000 models.

Web link for iKnow: https://support.huawei.com/iknow/?source=SupportE

Web link for the forum: https://forum.huawei.com/enterprise/en/Network-Energy/forum/100027?typeid=2313

2.3 Comparison Between Normal and Long String Design

This section compares PV string design scenarios with and without optimizers.

PV String Design in the Scenario Without Optimizers

Technical Specification Table:

Refer to JKM300M-60/1000V datasheet.

Maximum System Voltage: 1000VDC (UL and IEC)

Calculation for PV Modules per String:

Three-phase scenario: 1080 V / (39.1 V x K) ≈ 22 modules.

Example: JKM300M-60/1000V. K is the ambient temperature correction factor.

K = 1 + (Local lowest temperature – 25°C) x PV module temperature correction factor.

Example values: Local lowest temperature = -20°C; PV module temperature correction coefficient = -0.38%.

Diagram: Shows 22 PV modules in each PV string.

PV String Design in the Scenario with Full Configuration of Optimizers

For details, see the SUN2000-450W-P brochure.

Long String Design:

Diagram: Shows 33 PV modules in each PV string.

Calculation for PV Modules per String:

Maximum number of PV modules in each PV string (Three-phase): 10000 W / 300 W ≈ 33 modules.

Example: JKM300M-60/1000V.

2.4 Connecting the Optimizer

This section details the process of connecting optimizers, applicable to SUN2000-12/15/17/20KTL/M2.

Steps for Connecting Optimizers

1. Connect the optimizer input power cables.
2. Connect the positive probe of the multimeter to the positive output terminal of the optimizer and the negative probe to the negative output terminal. Check the output voltage and resistance of a single optimizer.

Optimizer Resistance Check:

Common Exception Scenarios

• Probes Reversed: The measured resistance R2 is less than the value measured when probes are correctly connected (may be less than 0.9 kΩ).
• Optimizer Input Not Connected: The voltage V1 is 0 V. The resistance R1 is 1 kΩ (±10%).
• Sunlight Weak / Optimizer Faulty: Resistance R1 > 1.1 kΩ.
• Optimizer Output Connected to PV Module Output: Resistance R1 > 1.1 kΩ.

Resistance Measurement Range Note: The multimeter's resistance measurement range can affect results. Select the minimum range that meets measurement requirements.

Full Configuration of Optimizers

Diagram: Illustrates connecting optimizers in a full configuration setup.

Connecting PV String to Inverter:

1. Connect cables between the PV string and the inverter.

Polarity Check:

If R is infinite, an open circuit or incorrect cable grouping is indicated. Rectify faults and group cables correctly.

If R4 < R3, A is positive, B is negative. If R3 < R4, B is positive, A is negative. Attach correct cable labels.

(Full configuration of optimizers) PV string reverse connection

This section details fault modes, symptoms, and alarms related to PV string reverse connections.

Diagrams: Illustrate PV string connections with extension cables, showing correct and reverse connections, and voltage comparisons.

Scenario: Extension cables with the same connectors at both ends are connected.

Examples:

• 1 reversely connected, 9 correctly connected
• 5 reversely connected, 5 correctly connected

PV string resistance exception

This section addresses resistance issues in PV strings configured with optimizers.

Infinite Resistance

Causes:

• There is a disconnected point in the PV string.
• Optimizer installation is optional.

Troubleshooting:

1. Set multimeter to voltage mode. If PV string voltage is not 0 V, check PV module connections to optimizers.
2. If voltage is 0 V, check if cables are in the same PV string, optimizer cables are properly connected, or if there's a disconnected point.
3. Verify that the two cables being tested are in the same PV string.
4. Use PV string cable connection detection: disconnect in the middle, measure resistance, repeat to narrow down the fault.
5. Narrow down to the last optimizer and rectify based on its measured resistance.

Diagram: Shows PV strings and indicates infinite resistance (R3) if test cables are from different PV strings or if there's a disconnected point.

Resistance Greater Than 100 kΩ

Causes:

• Some optimizers are not connected to PV modules.
• Input and output of some optimizers are reversely connected.

Troubleshooting:

1. Use PV string cable connection detection: disconnect in the middle, measure resistance, repeat to narrow down the fault.
2. Narrow down to the last optimizer and rectify based on its measured resistance.

Optimizer-related alarms

Video of a case: http://3ms.huawei.com/documents/docinfo/472978044911235072?l=en

Optimizer fault alarm

Steps to view optimizer status when an alarm occurs.

1. Open FusionSolar app, log in, choose My > Device commissioning, connect to inverter WLAN hotspot.
2. Select installer, enter login password, tap Log In.
3. Choose Device Monitoring, select PV string, check optimizer status.

Optimizer Status Examples:

• Green (Operating): Optimizer is running properly.
• Gray (Offline): Optimizer is offline. Check SN and location, search again.
• Red (Fault Alarm): Optimizer is faulty.

Fault Alarms:

Resistance measurement example

This section explains how to determine PV string polarity using resistance measurements and provides sample data.

Method: Polarity is determined by the ratio of resistance from common measurement to reverse measurement.

Measurement Result Analysis:

• Precision depends on multimeter model and number of optimizers.
• Common measurement resistance is greater than reverse measurement resistance.

Note: Rainy day ratios may change slightly but do not affect the measurement result.

Precision Formula: Precision = (R5/Number of optimizers – 1 kΩ) / 1 kΩ x 100%

2.5 Installation for Networking Devices

This section covers the installation of networking devices.

Smart Dongle Networking Scenario

Diagram: Illustrates the connection of SUN2000 inverters with a Smart Dongle.

Notes:

• SmartLogger cannot be connected in the Smart Dongle networking scenario.
• Smart power sensor is necessary for export limitation.
• Smart Dongle and smart power sensor must connect to the same inverter. Supported inverters: SUN2000-12/15/17/20KTL-M0/M2, 50/60KTL-M0, or 100KTL-M1.

Port Pin Definition for Smart Dongle:

SmartLogger Networking Scenario

Diagram: Illustrates the connection of SUN2000 inverters with a SmartLogger.

Notes:

• Smart Dongle cannot be connected in the SmartLogger networking scenario.
• A maximum of 80 inverters can be connected to a single SmartLogger. It is advised to connect fewer than 30 devices to each RS485 route.
• Smart power sensor is necessary for export limitation. Select according to project requirements.
• To ensure system response speed, connect the smart power sensor to a COM port other than the inverter COM port.

Port Pin Definition for SmartLogger:

(Optional) Installing the DTSU666-H (Three-phase Four-wire)

This section details the installation of the DTSU666-H smart power sensor.

1. Connect L1, L2, L3, N voltage lines to terminals 3, 6, 9, 10. Connect current transformer outlets IA*, IA, IB*, IB, IC*, IC to terminals 13, 14, 16, 17, 19, 21.
2. Connect RS485A and RS485B to the communication host.

Note: CT direction must be consistent with the arrow direction shown in the figure.

Diagram: Shows the DTSU666-H wiring for a three-phase four-wire system.

Pin Definitions:

SUN2000-50/60KTL-M0 Pin Definitions:

SUN2000-100KTL-M1 Pin Definitions:

(Optional) Installing the DTSU666-H (Three-phase Three-wire)

This section details the installation of the DTSU666-H smart power sensor in a three-phase three-wire system.

1. Connect L1, L3, L2 voltage lines to terminals 3, 9, 10. Connect current transformer outlets IA*, IA, IB*, IB, IC*, IC to terminals 13, 14, 16, 17, 19, 21.
2. Connect RS485A and RS485B to the communication host.

Note a: CT direction must be consistent with the arrow direction shown in the figure.

Note b: When connecting the DTSU666-H 250 A/50 mA smart power sensor in three-phase, three-wire mode, one phase line needs to be connected to the Ub (10) interface of the smart power sensor.

Diagram: Shows the DTSU666-H wiring for a three-phase three-wire system, noting that the L2 phase current transformer IB does not need to be connected.

Pin Definitions:

SUN2000-50/60KTL-M0 Pin Definitions:

SUN2000-100KTL-M1 Pin Definitions:

2.6 Installation Troubleshooting

This section provides guidance on troubleshooting installation issues, particularly related to DC input power cable polarity.

Important Note: If the DC input power cable polarity is reversed and the DC switch is ON, do not immediately turn off the DC switch or unplug connectors. Doing so may cause damage not covered by warranty. Wait until solar irradiance declines at night, PV string current drops below 0.5 A, then turn off the DC switch, remove connectors, correct polarity, and reconnect.

Power-Off for Troubleshooting Steps:

1. Safety First: Follow safety precautions (indicated by warning symbols ⚠️).
2. App Interaction: Use the App or Management System for shutdown procedures.
3. DC Switches: Turn off DC SWITCH 1, DC SWITCH 2, DC SWITCH 3.
4. Wait: Allow a 15-minute waiting period.
5. Disconnect: Turn off the AC switch.
6. Check Connections: Verify connections using a multimeter.
7. Reconnect: Correct string polarity before reconnecting.

Diagram: Illustrates the power-off sequence for troubleshooting, including app interaction, DC switch operations, and checking connections.