Huawei SUN2000 USL0 Series

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SUN2000-(3.8KTL-11.4KTL)-USL0

Power Compartment Quick Guide

Prerequisites

The power compartment of SUN2000-3.8KTL/5KTL/7.6KTL-USL0 and SUN2000-

9KTL/10KTL/11.4KTL-USL0 can be replaced in the same way. The following describes the

installation of the SUN2000-3.8KTL/5KTL/7.6KTL-USL0.

1. Powering off the system.

2. Before replacing the power compartment, ensure that the screw assemblies between the

maintenance compartment and mounting bracket have been tightened.

NOTE

Issue: 01

Part Number: 31509970

Date: 2018-06-22

NOTICE

• After the SUN2000 powers off, the remaining electricity and heat may still cause electric shock

and burns. After power-off, wait 5 minutes before servicing the SUN2000. Always wear

protective gloves when servicing the SUN2000.

• If the SUN2000 is connected to the battery, ensure that a shutdown command is sent from the

app. Power off the system after the SUN2000 has shut down. If no shutdown command is sent

from the app, the SUN2000 will shut down after the power grid is powered off. The SUN2000

will wait for 1 minute and restart (not grid-tied) and charge the battery, which poses an electrical

hazard when you turn off the DC switch.

• If Off-grid mode is set to Enable and Grid-tied/Off-grid mode switching is set to Automatic

switching for the SUN2000, ensure that a shutdown command is sent from the app and power

off the system only after the SUN2000 has shut down. If no shutdown command is sent from

the app, the SUN2000 will switch to the backup state after the power grid is powered off, which

poses an electrical hazard when you turn off the DC switch.

a. Send a shutdown command from the app.

b. Turn off the AC switch between the SUN2000 and the power grid.

c. Turn off the DC switch at the bottom of the SUN2000.

d. If a battery connects to the battery port of the SUN2000, power off the battery.

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Summary

Prerequisites for Power Compartment Replacement

System Power-Off Procedure

Safely power off the SUN2000 system, including waiting periods and protective measures before servicing.

Pre-Replacement Screw Check

Ensure screw assemblies between maintenance and mounting brackets are tightened before replacement.

Power Compartment Replacement Procedure

Remove Maintenance Compartment Cover

Instructions for removing the cover of the maintenance compartment.

Disconnect Signal and Enable Terminals

Guidance on detaching the 10-pin signal and 2-pin enable terminal connectors.

Disconnect Module Cables

Instructions for disconnecting USB (4G model) and WLAN cables.

Disconnect Power Cables

Steps to disconnect the DC, AC, and fuse cables from the unit.

Remove Ground and Securing Screws

Procedure to detach the ground cable and remove four M6 screws securing compartments.

Remove and Install Power Compartment

Steps for removing the old power compartment and installing the new one with mounting kits.

Reconnect Cables and Terminals

Sequence for reconnecting ground, fuse, AC, DC cables, module cables, and terminals.

Finalize Installation

Reinstalling the maintenance compartment cover to complete the replacement process.