SMA SMB User Manual
EN
Accessories for Central Inverter
SUNNY MAIN BOX / SUNNY MAIN BOX CABINET
Installation Manual
SMB-IA-en-10 | 98-4031510 | Version 1.0
SMA Solar Technology AG Table of Contents
Table of Contents
1 Information on this Document. . . . . . . . . . . . . . . . . . . . . . . 5
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 Intended Use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2 Qualification of Skilled Persons . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.3 Safety Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3 Scope of Delivery. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.1 Sunny Main Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.2 Sunny Main Box Cabinet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4 Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.1 Sunny Main Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.2 Sunny Main Box Cabinet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.3 Type Label . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5 Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.1 Mounting the Sunny Main Box. . . . . . . . . . . . . . . . . . . . . . . . . 16
5.1.1 Selecting the Mounting Location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.1.2 Mounting the Sunny Main Box on a Wall . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.2 Mounting the Sunny Main Box Cabinet . . . . . . . . . . . . . . . . . . 18
5.2.1 Selecting the Mounting Location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.2.2 Mounting the Base . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.2.3 Mounting the Sunny Main Box Cabinet on the Base . . . . . . . . . . . . . . . . . . 19
6 Electrical Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.1 Overview of the Connection Area . . . . . . . . . . . . . . . . . . . . . . 20
6.1.1 Sunny Main Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.1.2 Sunny Main Box Cabinet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.2 Connecting the String Cables to the Fuse Holders . . . . . . . . . . 23
6.3 Connecting the DC Input Cables . . . . . . . . . . . . . . . . . . . . . . . 24
Installation Manual SMB-IA-en-10 3
Table of Contents SMA Solar Technology AG
6.4 Connecting the Earth Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
7 Requirements for Commissioning . . . . . . . . . . . . . . . . . . . 25
8 Disconnecting the Sunny Main Box or
Sunny Main Box Cabinet. . . . . . . . . . . . . . . . . . . . . . . . . . 26
9 Decommissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
9.1 Dismantling Sunny Main Box and Sunny Main Box Cabinet . . 28
9.2 Disposing of Sunny Main Box and Sunny Main Box Cabinet . 28
10 Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
11 Contact . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
4 SMB-IA-en-10 Installation Manual
SMA Solar Technology AG 1 Information on this Document
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1 Information on this Document
Validity
This document is valid for the following device types:
•SMB
•SMB-C
Target Group
This document is intended for skilled persons. Only persons with appropriate skills are allowed to
perform the tasks set forth in this document (see Section 2.2"Qualification of Skilled
Persons",page8).
Additional Information
Links to additional information can be found at www.SMA-Solar.com:
Document title Document type
Sunny Main Box - Connection of DC cabling for PV inverters Technical Information
Sunny Main Box Cabinet - Connection of DC cabling for PV inverters Technical Information
Symbols
Symbol Explanation
Indicates a hazardous situation which, if not avoided, will result in death or
serious injury
Indicates a hazardous situation which, if not avoided, could result in death or
serious injury
Indicates a hazardous situation which, if not avoided, could result in minor or
moderate injury
Indicates a situation which, if not avoided, could result in property damage
Information that is important for a specific topic or goal, but is not
safety-relevant
☐ Indicates an essential requirement for achieving a specific goal
☑ Desired result
✖ A problem that might occur
Installation Manual SMB-IA-en-10 5
1 Information on this Document SMA Solar Technology AG
Abbreviations
Abbreviation Designation Explanation
AC Alternating Current ‒
DC Direct Current ‒
LV/HRC Low-Voltage, High Rupturing Capacity ‒
PV Photovoltaics ‒
6 SMB-IA-en-10 Installation Manual
SMA Solar Technology AG 2 Safety
2Safety
2.1 Intended Use
The Sunny Main Box and the Sunny Main Box Cabinet are DC main distributions which gather the
outgoing string cables from the DC sub-distributions and lead them to the central inverter via the
DC main cable.
Figure1: Overview of a PV plant with Sunny Main Boxes and a central inverter
Position Designation
APV modules
B DC sub-distribution (e.g. Sunny String-Monitor)
C DC main distribution, e.g., Sunny Main Box
D Central inverter
E Transformer station, z. B. Transformer Compact Station
F Electricity grid
For optimum operation of the Sunny Main Box or Sunny Main Box Cabinet, observe the requirements
for the mounting location. 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 this
product.
The enclosed documentation is an integral part of this product.
• Read and observe the documentation.
• Keep the documentation in a convenient place for future reference.
Only use the Sunny Main Box and Sunny Main Box Cabinet in accordance with the information
provided in the enclosed documentation. Any other use may result in personal injury or property
damage.
Installation Manual SMB-IA-en-10 7
2 Safety SMA Solar Technology AG
2.2 Qualification of Skilled Persons
The work described in this document must be performed by skilled persons only. Skilled persons must
have the following qualifications:
• Knowledge of how the device works and is operated
• Training in how to deal with the dangers and risks associated with installing and using electrical
devices
• Training in the installation and commissioning of electrical devices
• Knowledge of all applicable standards and directives
• Knowledge of and compliance with this document and all the safety precautions
2.3 Safety Precautions
Electric Shock
High voltages capable of causing electric shocks are present in the Sunny Main Box and
Sunny Main Box Cabinet. Therefore, work on the Sunny Main Box and Sunny Main Box Cabinet is
permitted only with the power disconnected and in compliance with the guidelines applicable at the
installation location.
• Disconnecting the device:
– If there is a DC power switch in the upstream DC sub-distributions, switch it off.
– Only re move t he DC f uses o n the c entra l inverter once the inverter is disconnected and using
the LV/HRC fuse handle.
– If the central inverter is equipped with the "Optiprotect" option, switch the miniature circuit-
breakers in the central inverter off.
– Only pull out the DC fuse in the Sunny Main Box or Sunny Main Box Cabinet once the
inverter is disconnected and using the LV/HRC fuse handle.
• Ensure that the device cannot be reconnected.
• Check that no voltage is present.
• Earth and short-circuit.
• Cover or shield any adjacent live components. Protective covers must always be in place.
In the event of an earth fault, remember that plant components which are presumed earthed may still
be live.
• Ensure that no voltage is present before touching any plant components.
8 SMB-IA-en-10 Installation Manual
SMA Solar Technology AG 2 Safety
If the Sunny Main Box or Sunny Main Box Cabinet is operated in a damaged condition, there is a
risk of serious injury by electric shock.
• Only use the Sunny Main Box or Sunny Main Box Cabinet when it is in perfect working order
and can be operated safely.
• Regularly check the Sunny Main Box or Sunny Main Box Cabinet for visible damage.
• Ensure that all external safety equipment is freely accessible at all times and that regular checks
are carried out to ensure that it is fully functional.
Burn Hazards
Some device components such as fuses can get hot during operation.
• Wear safety gloves when working on the device.
Damage to the Sunny Main Box or Sunny Main Box Cabinet
If unauthorised persons interfere with the Sunny Main Box, Sunny Main Box Cabinet or PV plant, the
equipment could be damaged.
• Lock the devices once they have been put into operation.
• Remove the keys from the door locks.
• Store the keys in a safe place.
When closed, the Sunny Main Box and Sunny Main Box Cabinet correspond to International
Pr ote cti on R ati ng 5 4 an d ar e th us p rot ect ed f rom int rus ion of d ust and water. Penetrating moisture can
damage the Sunny Main Box or Sunny Main Box Cabinet.
• Do not perform any installation work in rainy or foggy conditions, or wh en hum idity is ove r 95%.
• After completion of work on the Sunny Main Box or Sunny Main Box Cabinet, lock the doors
again.
Installation Manual SMB-IA-en-10 9
3 Scope of Delivery SMA Solar Technology AG
3Scope of Delivery
3.1 Sunny Main Box
Check the scope of delivery for completeness and any externally visible damage. Contact your
specialist dealer if the delivery is incomplete or damaged.
Figure2: Components included in scope of delivery
Position Quantity Designation
A 1 Sunny Main Box
B 1 Switch cabinet key
C 8 Seal insert 7.0 mm … 20.5 mm
8 Seal insert 17.0 mm … 20.5 mm
16 Seal insert 20 mm … 25 mm
16 Seal insert 24 mm … 28 mm
8 Seal insert 29 mm … 34 mm
8 Seal insert 32 mm … 36 mm
D 1 Installation manual
10 SMB-IA-en-10 Installation Manual
SMA Solar Technology AG 3 Scope of Delivery
3.2 Sunny Main Box Cabinet
Check the scope of delivery for completeness and any externally visible damage. Contact your
specialist dealer if the delivery is incomplete or damaged.
Figure3: Components included in scope of delivery
Position Quantity Designation
A 1 Sunny Main Box Cabinet
B 1 Switch cabinet key
C 1 Installation manual
D1Base
E 25 Cable clamp 22 mm … 28 mm
F 9 Cable clamp 28 mm … 34 mm
G 25 Bottom saddle for cable clamp 22 mm … 28 mm
H9Bottom saddle for cable clamp 28 mm … 34 mm
Installation Manual SMB-IA-en-10 11
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