SMA Sunny Island MULTICLUSTER BOX 6.3 User manual

MC-BOX-6_12-BE-en-20 | Version 2.0 ENGLISH
Operating Manual
Multicluster Box 6.3 ⁄ 12.3

Legal Provisions SMA Solar Technology AG
2 MC-BOX-6_12-BE-en-20 Operating Manual
Legal Provisions
The information contained in this document is the property of SMA Solar Technology AG. Publishing its content, either partially or
in full, requires the written permission of SMA Solar Technology AG. Any internal company copying of the document for the
purposes of evaluating the product or its correct implementation is allowed and does not require permission.
SMA Warranty
The current warranty conditions come enclosed with your device. These are also available online at www.SMA-Solar.com and can
be downloaded and are available on paper from the usual sales channels if required.
Trademarks
All trademarks are recognized even if these are not marked separately. Missing designations do not mean that a product or brand
is not a registered trademark.
The Bluetooth® word mark and logos are registered trademarks owned by Bluetooth SIG, Inc. and any use of such marks by
SMA Solar Technology AG is under license.
QR Code® is a registered trademark of DENSO WAVE INCORPORATED.
SMA Solar Technology AG
Sonnenallee 1
34266 Niestetal
Germany
Tel. [phone]
Fax [phone]
www.SMA.de
E-mail: [email protected]e
© 2004 to 2014 SMA Solar Technology AG. All rights reserved.

SMA Solar Technology AG Table of Contents
Operating Manual MC-BOX-6_12-BE-en-20 3
Table of Contents
1 Information on this Document. . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 Intended Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2 Skills of Qualified Persons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.3 Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3 Scope of Delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4 Type Label. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5 Mounting and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.1 Multicluster Box 6.3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.1.1 Selecting the Mounting Location . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.1.2 Mounting the Multicluster Box 6.3 on the Wall. . . . . . . . . . . . . . . . 14
5.2 Multicluster Box 12.3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.2.1 Selecting a Mounting Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.2.2 Transporting the Multicluster Box 12.3 . . . . . . . . . . . . . . . . . . . . . . 17
5.2.3 Installing the Multicluster Box 12.3 . . . . . . . . . . . . . . . . . . . . . . . . . 18
6 Electrical Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.1 Overview of the Connection Area. . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.1.1 Interior View of the Multicluster Box 6.3 . . . . . . . . . . . . . . . . . . . . . 20
6.1.2 Bottom View of the Multicluster Box 6.3 . . . . . . . . . . . . . . . . . . . . . 21
6.1.3 Interior View of the Multicluster Box 12.3 . . . . . . . . . . . . . . . . . . . . 22
6.1.4 Bottom View of the Multicluster Box 12.3 (without Base) . . . . . . . . 23
6.2 Preparing the Cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
6.3 Cable Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
6.3.1 Connecting the Generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6.3.2 Connecting the Loads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
6.3.3 Connecting the PV System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
6.3.4 Connecting the Sunny Island . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
6.3.5 Grounding the Multicluster System . . . . . . . . . . . . . . . . . . . . . . . . . 30

Table of Contents SMA Solar Technology AG
4 MC-BOX-6_12-BE-en-20 Operating Manual
6.4 Data Cable Connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
6.4.1 Inserting the Data Cables into the Multicluster Box . . . . . . . . . . . . . 31
6.4.2 Connecting the Data Cables for Control and Measuring Signals . . 33
6.4.3 Connecting the Data Cables for Communication . . . . . . . . . . . . . . 33
7 Commissioning the Multicluster Box. . . . . . . . . . . . . . . . . . . . . 34
8 Disconnecting the Multicluster System from
Voltage Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
9 Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
10 Decommissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
10.1 Disassembling the Multicluster Box 6.3. . . . . . . . . . . . . . . . . . . . . . . 37
10.2 Disassembling the Multicluster Box 12.3. . . . . . . . . . . . . . . . . . . . . . 37
10.3 Storing the Product . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
10.4 Disposal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
11 Technical Data of the Multicluster Box 6.3. . . . . . . . . . . . . . . . 38
12 Technical Data of the Multicluster Box 12.3 . . . . . . . . . . . . . . 42
13 Contact . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

SMA Solar Technology AG 1 Information on this Document
Operating Manual MC-BOX-6_12-BE-en-20 5
1 Information on this Document
Validity
This document is valid for the following device types:
• MC-Box-6.3-11
• MC-Box-12.3
Target Group
This document is intended for qualified persons. Only persons with the appropriate skills are allowed
to perform the tasks described in this document (see Section2.2 "Skills of Qualified Persons", page8).
Symbols
Nomenclature
Symbol Explanation
%"/(&3 Indicates a hazardous situation which, if not avoided, will result in
death or serious injury
8"3/*/(
Indicates a hazardous situation which, if not avoided, can result
in death or serious injury
$"65*0/ Indicates a hazardous situation which, if not avoided, can result
in minor or moderate injury
/05*$& Indicates a situation which, if not avoided, can result in property
damage
Indicates that the following section contains tasks that must only
be performed by qualified persons
Information that is important for a specific topic or goal, but is not
safety-relevant
☐ Indicates a requirement for meeting a specific goal
☑ Desired result
✖ A problem that might occur
Complete designation Designation in this document
Multicluster Box 6.3-11 / 12.3 Multicluster Box
Sunny Island multicluster system Multicluster system

1 Information on this Document SMA Solar Technology AG
6 MC-BOX-6_12-BE-en-20 Operating Manual
Abbreviations
Abbreviation Designation Explanation
AC Alternating Current ‒
DC Direct Current ‒
PV Photovoltaics ‒

SMA Solar Technology AG 2 Safety
Operating Manual MC-BOX-6_12-BE-en-20 7
2 Safety
2.1 Intended Use
The Multicluster Box is a device of a multicluster system. It is used to establish stand-alone grids with
several Sunny Island inverters. The Multicluster Box is a stationary switching device combination
(AC main distributor) to which you can connect the Sunny Island inverters, the loads, the generator
and another power generation system such as a PV system.
Connection only to TN system
The Multicluster Box is only suitable for the connection to a TN system.

2 Safety SMA Solar Technology AG
8 MC-BOX-6_12-BE-en-20 Operating Manual
Only commission the Multicluster Box in conjunction with Sunny Island inverters of device type
SI 6.0H/8.0H/5048.
The maximum connection power of the individual outputs must not be exceeded, e.g. the maximum
connectable PV power of 55 kW for the Multicluster Box 6.3.
The conductors of all connection cables must be made of copper.
The Multicluster Box is designed for use at altitudes of up to 2,000 m above mean sea level. If you
wish to use the Multicluster Box at altitudes above 2,000 m, contact SMA Solar Technology AG.
The Multicluster Box is designed for indoor use only.
The product is designed for EMC environment A* . In EMC environment B*, the product can cause
undesired electromagnetic interference. If the product is operated in EMC environment B, take
protective measures against electromagnetic interference in accordance with the locally applicable
standards and directives.
Only use this product in accordance with the enclosed documentation and with the local standards
and directives. Any other application may cause personal injury or property damage.
For safety reasons, it is not permitted to modify the product or install components that are not explicitly
recommended or distributed by SMA Solar Technology AG for the product. Unauthorized
modifications and installations will void all warranty claims and the operating permission.
Any use of the product other than described in the Intended Use section does not qualify as
appropriate usage.
The enclosed documentation is an integral part of this product. Keep the documentation in a
convenient place for future reference and observe all instructions contained therein.
The type label must remain permanently attached to the product.
2.2 Skills of Qualified Persons
Qualified persons must have the following skills:
• Training in off-grid systems from SMA Solar Technology AG
• Training in how to deal with the dangers and risks associated with installing and operating
electrical devices and batteries
• Training in the installation and commissioning of electrical devices
• Knowledge of and adherence to the local standards and directives
• Knowledge of and adherence to this document and all safety precautions
* in accordance with IEC 61439-1:2011

SMA Solar Technology AG 2 Safety
Operating Manual MC-BOX-6_12-BE-en-20 9
2.3 Safety Precautions
This section contains safety precautions that must be observed at all times when working on or with
the product. To prevent personal injury and property damage and to ensure long-term operation of
the product, read this section carefully and follow all safety precautions at all times.
8"3/*/(
Danger to life due to electric shock
High voltages are present in the Multicluster Box. Touching live components can result in death or
serious injury due to electric shock.
• Disconnect the multicluster system from all voltage sources before carrying out any work on
the Multicluster Box (see Section8, page35).
Problems occurring while performing the described activities
Should you encounter problems while performing the activities described in this document,
contact SMA Solar Technology AG (see Section13 "Contact", page44).

3 Scope of Delivery SMA Solar Technology AG
10 MC-BOX-6_12-BE-en-20 Operating Manual
3 Scope of Delivery
Check the scope of delivery for completeness and any externally visible damage. Contact your
distributor if the scope of delivery is incomplete or damaged.
Multicluster Box 6.3
Position Quantity Description
A 1 Multicluster Box
B 1 Switch cabinet key
C 1 Data cable for communication (5 m, black)
D 3 Data cable for control and measuring signals (5 m, red)
E 1 Operating manual and connection overview
F 4 Sealing ring with washer (diameter: 6 mm)
G 4 Sealing ring with washer (diameter: 8 mm)

SMA Solar Technology AG 3 Scope of Delivery
Operating Manual MC-BOX-6_12-BE-en-20 11
Multicluster Box 12.3
Position Quantity Description
A 1 Multicluster Box
B 1 Switch cabinet key
C 1 Data cable for communication (5 m, black)
D 3 Data cable for control and measuring signals (5 m, red)
E1Operating manual
F 4 Sealing ring with washer (diameter: 6 mm)
G 4 Sealing ring with washer (diameter: 8 mm)
H 1 Strain relief with counter-trough (22 mm to 28 mm)
I 3 Strain relief with counter-trough (52 mm to 58 mm)
J 3 Strain relief with counter-trough (58 mm to 64 mm)

4 Type Label SMA Solar Technology AG
12 MC-BOX-6_12-BE-en-20 Operating Manual
4 Type Label
The type label clearly identifies the product. The type label is located on the right-hand side of the
enclosure. You will find the following information on the type label:
• Address of SMA Solar Technology AG
• Device type (Type)
•Serial number (Serial No.)
• Article number (Art No.)
• Date of manufacture
You will require the information on the type label to use the product safely and when seeking customer
support from the SMA Service Line.
Symbols on the Type Label
Symbol Explanation
Danger to life due to high voltages
The product operates at high voltages. All work on the product must be
carried out by qualified persons only.
Risk of burns due to hot surfaces
The product can get hot during operation. Avoid contact during operation.
Allow the product to cool down sufficiently before carrying out any work.
Wear personal protective equipment such as safety gloves.
Observe the documentation.
Observe all documentation supplied with the product.
WEEE designation
Do not dispose of the product together with the household waste but in
accordance with the locally applicable disposal regulations for electronic
waste.
CE marking
The product complies with the requirements of the applicable EU directives.
Degree of protection
The product is protected against interior dust deposits and water jets from all
angles.

SMA Solar Technology AG 5 Mounting and Installation
Operating Manual MC-BOX-6_12-BE-en-20 13
5 Mounting and Installation
5.1 Multicluster Box 6.3
5.1.1 Selecting the Mounting Location
Requirements:
☐ The mounting location and method must be suitable for the weight and dimensions.
☐ Mount on a solid support surface.
☐ The mounting location must be accessible at all times.
☐ The ambient temperature must be between –25°C and +50°C to guarantee optimal
operation.
☐ Vertical installation, connection area must point downwards.
8"3/*/(
Danger to life due to fire or explosion
Despite careful construction, electronic devices can cause fires if they are not installed properly.
This can result in death or serious injury.
• Do not install the Multicluster Box on flammable construction materials.
• Do not store any highly flammable materials or products in the vicinity of the Multicluster Box.
• Do not install the Multicluster Box in potentially explosive areas.
Optimum mounting location
If the Multicluster Box and the Sunny Island inverters are operated under different ambient
conditions, the circuit breakers for the Sunny Island inverters may trip more often.
• To ensure optimum operation, mount or install the Multicluster Box and the Sunny Island
inverters at the same location.

5 Mounting and Installation SMA Solar Technology AG
14 MC-BOX-6_12-BE-en-20 Operating Manual
5.1.2 Mounting the Multicluster Box 6.3 on the Wall
Additionally required mounting material (not included in the scope of delivery):
☐ Four screws suitable for the support surface
☐ Four screw anchors suitable for the support surface and the screws
Procedure:
1. Mark the position of the drill holes.
2. Drill holes (recommended diameter: 6 mm) at the marked position.
8"3/*/(
Danger of crushing or damage to the Multicluster Box
The Multicluster Box can fall down as a result of improper transport and cause severe crushing
injuries.
• Take the weight of the Multicluster Box of approximately 60 kg into account.

SMA Solar Technology AG 5 Mounting and Installation
Operating Manual MC-BOX-6_12-BE-en-20 15
3. Open the Multicluster Box with the switch cabinet key included in the delivery.
5. Attach the Multicluster Box to the wall using
suitable screws, washers and sealing discs.
6. Ensure that the device is securely in place.
4.
/05*$&
Damage to the Multicluster Box
Dust and moisture can penetrate the Multicluster Box due to missing seals.
• Position the sealing disc (C).
• Position the washer (B).
• Secure the sealing disc and the washer using a
suitable screw (A).

5 Mounting and Installation SMA Solar Technology AG
16 MC-BOX-6_12-BE-en-20 Operating Manual
5.2 Multicluster Box 12.3
5.2.1 Selecting a Mounting Location
Observe the following conditions during mounting:
• Mount the product on a solid support surface, e.g. a concrete foundation.
• The mounting location must be accessible at all times.
• Observe the corresponding minimum passage widths and escape routes.
• Vertical installation:
Properties of the support surface:
The support surface must guarantee solid and safe positioning of the Multicluster Box. When selecting
the support surface, take the weight of the Multicluster Box of 110 kg into account. The Multicluster
Box must be installed on a level surface. Correct any existing unevenness or depression in the support
surface.
8"3/*/(
Danger to life due to fire or explosion
Despite careful construction, electronic devices can cause fires if they are not installed properly.
This can result in death or serious injury.
• Do not install the Multicluster Box on flammable construction materials.
• Do not store any highly flammable materials or products in the vicinity of the Multicluster Box.
• Do not install the Multicluster Box in potentially explosive areas.

SMA Solar Technology AG 5 Mounting and Installation
Operating Manual MC-BOX-6_12-BE-en-20 17
5.2.2 Transporting the Multicluster Box 12.3
Transport options:
The Multicluster Box is delivered on a Euro pallet. You can use the following means of transport to lift
the Multicluster Box from the Euro pallet:
• Forklift truck or pallet truck
• Crane with suitable fork
8"3/*/(
Danger of crushing or damage to the Multicluster Box
The Multicluster Box can fall down as a result of improper transport and cause severe crushing
injuries.
• The means of transport must be suitable for the weight of the Multicluster Box.
• The Multicluster Box must only be transported in an upright position.
• Pay attention to the center of gravity of the Multicluster Box. The center of gravity is located in
the top third of the Multicluster Box.
/05*$&
Damage to the Multicluster Box due to inappropriate transport
If the Multicluster Box is set down on uneven surfaces, it may cause buckling so that the doors will
no longer close properly. This can lead to moisture and dust penetrating the Multicluster Box.
• Never place the Multicluster Box on an unpaved, uneven surface.
• Never transport the Multicluster Box with mounted kick plates.

5 Mounting and Installation SMA Solar Technology AG
18 MC-BOX-6_12-BE-en-20 Operating Manual
Procedure:
1. Remove all fastening screws from the kick plates at the front and rear.
2. Set the screws aside. These screws will be needed later to reattach the kick plates.
3. Remove the kick plates and set them aside.
4. Slide the fork of the lift, pallet truck or crane underneath the Multicluster Box and transport the
Multicluster Box to the mounting location.
5.2.3 Installing the Multicluster Box 12.3
1. Mark the positions of the drill holes for attaching the base.

SMA Solar Technology AG 5 Mounting and Installation
Operating Manual MC-BOX-6_12-BE-en-20 19
2. Only attach the Multicluster Box to the wall, if you want to secure it additionally.
• Mark the positions of the drill holes for attaching the rear panel.
• Drill holes at the marked positions.
• Insert the screw anchors.
3. Position the Multicluster Box on the support surface against the wall.
4. Use four suitable screws to attach the Multicluster Box to the wall.
5. Attach the Multicluster Box to the support surface using four suitable screws.

6 Electrical Connection SMA Solar Technology AG
20 MC-BOX-6_12-BE-en-20 Operating Manual
6 Electrical Connection
6.1 Overview of the Connection Area
6.1.1 Interior View of the Multicluster Box 6.3
Object Description
A RJ45 pin connectors for connecting the data cables for control and measuring
signals
B RJ45 pin connector for connecting the data cable for communication
C Fuse switch-disconnector F1 Generator for connecting the generator (L1, L2, L3)
DTerminals X1 Generator for connecting the generator (N, grounding conductor)
E Fuse switch-disconnector F2 Loads for connecting the loads (L1, L2, L3)