Huawei Backup Box-B0 Manuel utilisateur

Backup Box-(B0, B1)

Quick Guide

Issue: 01

Date: 2021-01-10

1Overview

3. Only certified electricians are allowed to operate the device. Operation personnel must wear

proper personal protective equipment (PPE).

1. The information in this document is subject to change without notice. Every effort has been

made in the preparation of this document to ensure accuracy of the contents, but all

statements, information, and recommendations in this document do not constitute a

warranty of any kind, express or implied.

2. Before installing the device, read the user manual carefully to get familiar with product

information and safety precautions.

4. Before installing the device, check that the package contents are intact and complete against

the packing list. If any item is missing or damaged, contact your dealer.

5. The device damage caused by the violation of instructions in this document is not covered

under warranty.

6. The cable colors involved in this document are for reference only. Select cables in accordance

with local cable specifications.

Function

The Backup Box is used in a residential rooftop PV plant system to control the inverter grid-tied

or off-grid state. When the grid fails, the inverter switches to the off-grid state and supplies

power to off-grid loads in backup mode. When the grid recovers, the inverter switches back to

the grid-tied state.

Model Number

No.

Meaning

Value

Product name

Backup Box: Backup Box

Design code

B0: single

-phase

B1: three

-phase

System Networking

The grid-tied system of a rooftop PV plant consists of PV strings, an energy storage system (ESS),

an inverter, a Backup Box, a management system, an AC switch, and a power distribution unit.

Appearance

(1) Front panel

(2) Lock

(3) Hanging kit

(4) Off

-grid load port (BACKUP LOAD)

(5) Grid AC port (GRID)

(6) Inverter AC port (INVERTER AC)

(7) COM port (COM)

(8) Ventilation valve

(9) Ground point

Supported Grid Types

The Backup Box supports the following grid types: TN-S, TN-C-S and TT. When the inverter is in

three-phase, three-wire mode, the Backup Box does not support off-grid operation.

Installation Space Angle

1. When a Backup Box is installed outdoors, avoid direct sunlight. You are advised to install it in

a sheltered place or install an awning over it.

2. A surge protective device (SPD) needs to be installed on the grid side of the Backup Box.

Installation Requirements

2.1

2Device Installation

(10) Off

-grid load switch

Mounting Holes and Dimensions

When drilling holes, avoid the water pipes and power cables buried in the wall.

Installing a Backup Box

2.2

M6x60 expansion bolts are delivered with the Backup Box. If the length and number of the

bolts do not meet installation requirements, prepare M6 stainless steel expansion bolts by

yourself.

The expansion bolts delivered with the inverter are mainly used for solid concrete walls. For

other types of walls, prepare bolts by yourself and ensure that the wall meets the load

bearing requirements of the inverter.

In residential areas, do not install the inverter on drywalls or walls made of similar

materials which have a weak sound insulation performance because the noise generated by

the inverter is noticeable.

Level

Preparations

3.1

Connect cables in accordance with local installation laws and regulations.

Before connecting cables, ensure that the circuit breaker on the Backup Box and all the

switches connecting to the Backup Box are set to OFF position. Otherwise, the high voltage

of the Backup Box may result in electric shocks.

3Electrical Connection

No.

Cable

Type

Conductor Cross

Sectional Area Range

Outer Diameter

PE cable

Single

core outdoor copper

cable

–10 mm2

N/A

Off

-grid load

output power cable

Outdoor copper cable

–6 mm2

–21 mm

Grid AC output

power cable

Outdoor copper cable

–6 mm2

–21 mm

Inverter AC input

power cable

Outdoor copper cable

–6 mm2

–21 mm

Signal cable

Two

-core outdoor shielded

twisted pair cable

0.20

–1 mm2

–8 mm

Prepare cables based on site requirements.

Installing a PE Cable

3.2

Do not connect the neutral wire to the enclosure as a PE cable. Otherwise, electric shocks

may occur.

Ground point

Installing an Output Power Cable for Off-Grid Loads

3.3

Installing a Grid AC Output Power Cable

3.4

Before installing a cable, open the panel of the Backup Box, route the cable through the off-grid

load port, and connect the cable. After all cables are connected, reinstall the panel.

Off-Grid Load Terminal (X1)

No.

Single-

Phase

Off-Grid Load Terminal (X1)

No.

Three

Phase

Connecting Grid AC Terminals（X2）

No.

Single

-Phase

If multiple inverters are connected in parallel, the connection of AC power cables L1, L2, and L3

on the power grid side of the Backup Boxes connected to each inverter must be the same.

Installing an Inverter AC Input Power Cable

3.5

Connecting Grid AC Terminals（X2）

No.

Three

-Phase

Connecting AC Input Terminals of the Inverter（X3）

No.

Single

-Phase

Connecting AC Input Terminals of the Inverter（X3）

No.

Three

-Phase

Installing a Short-Circuiting Plate

3.6

The sequence of connecting the cables to a single-phase Backup Box and to the AC terminals L,

N, and PE on the inverter must be the same. The sequence of connecting the cables to a three-

phase Backup Box and to the AC terminals L1, L2, and L3 on the inverter must be the same.

Otherwise, the device cannot work properly. (As shown in the following figures, connect the

cables to a single-phase Backup Box in the sequence of L, N, and PE from left to right, and

connect the cables to a three-phase Backup Box in the sequence of L1, L2, and L3.)

Backup Box-side terminal (single-phase) Inverter-side terminal (single-phase)

Backup Box-side terminal (three-phase) Inverter-side terminal (three-phase)

No.

Label

Definition

Note

Digital input signal+

Connects to the positive pole of the DI port and functions as

the port for the Backup Box to send feedback signals.

GND

of the DI port

Connects to the

GND of the DI port.

Communications Terminal Definition

Installing Signal Cables

3.7

Neutral Wire Disconnected

If the neutral wire needs to be disconnected in off-grid mode (such as in German), according to

the local power grid standard, insert the short-circuiting plate between 10 and 11 of the AC

terminal X3 for the single-phase Backup Box. Insert the short-circuiting plate between 12 and

13 of the AC terminal X3 for the three-phase Backup Box.

Power grid AC terminal X2

(Single-Phase/Three-Phase)

Inverter AC terminal X3 (single-phase) Inverter AC terminal X3 (three-phase)

Neutral Wire Connected

If the neutral wire cannot be disconnected from the power grid in off-grid mode (such as in

Australia), insert the short-circuiting plate between 4 and 5 of the AC terminal X2 according to

the local power grid standard.

•When installing a short-circuiting plate, ensure that it is inserted into the correct port and

securely installed to avoid short circuits caused by incorrect installation.

•If no short-circuiting plate is installed, the neutral wire will be suspended in off-grid mode,

but the off-grid/grid-tied switching function is not affected. You are advised to install a

short-circuiting plate according to the local power grid standard.

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