SMA ST6-US User Manual

US

Mounting Rack

SUNNY TOWER-US ST6US/ST36/ST42/ST48

Installation Guide

ST36-48US-IA-IUS112321 | IMUS-ST36-48 | Version 2.1

SMA America, LLC Legal Restrictions

Copyright © 2011 SMA America,LLC. All rights reserved.
No part of this document may be reproduced, stored in a retrieval system, or transmitted, in any form

or by any means, electronic, mechanical, photographic, magnetic or otherwise, without the prior
written permission of SMA America,LLC.

Neither SMA America,LLC nor SMA Solar Technology Canada Inc. makes representations, express
or implied, with respect to this documentation or any of the equipment and/or software it may
describe, including (with no limitation) any implied warranties of utility, merchantability, or fitness for
any particular purpose. All such warranties are expressly disclaimed. Neither SMA America,LLC nor
its distributors or dealers nor SMA Solar Technology Canada Inc. nor its distributors or dealers shall
be liable for any indirect, incidental, or consequential damages under any circumstances.

(The exclusion of implied warranties may not apply in all cases under some statutes, and thus the
above exclusion may not apply.)

Specifications are subject to change without notice. Every attempt has been made to make this
document complete, accurate and up-to-date. Readers are cautioned, however, that
SMAAmerica,LLC and SMA Solar Technology Canada Inc. reserve the right to make changes
without notice and shall not be responsible for any damages, including indirect, incidental or
consequential damages, caused by reliance on the material presented, including, but not limited to,
omissions, typographical errors, arithmetical errors or listing errors in the content material.

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 America,LLC and SMA Solar Technology Canada Inc. is under
license.

SMA America, LLC

3801 N. Havana Street

Denver, CO 80239 U.S.A.

SMA Solar Technology Canada Inc.

2425 Matheson Blvd. E, 8th Floor

Mississauga, ON L4W 5K5, Canada

Installation Guide ST36-48US-IA-IUS112321 3

Important Safety Instructions SMA America, LLC

IMPORTANT SAFETY INSTRUCTIONS

SAVE THESE INSTRUCTIONS

This manual contains important instructions for the following products:

•Sunny Tower-US

This manual must be followed during installation and maintenance.

The product is designed and tested according to international safety requirements, but as with all
electrical and electronic equipment, certain precautions must be observed when installing and/or
operating the product. To reduce the risk of personal injury and to ensure the safe installation and
operation of the product, you must carefully read and follow all instructions, cautions and warnings
in this manual.

Warnings in this document

A warning describes a hazard to equipment or personnel. It calls attention to a procedure or practice,
which, if not correctly performed or adhered to, could result in damage to or destruction of part or all
of the SMA equipment and/or other equipment connected to the SMA equipment or personal injury.

DANGER

DANGER indicates a hazardous situation which, if not avoided, will result in death or
serious injury.

WARNING

WARNING indicates a hazardous situation which, if not avoided, could result in death or
serious injury.

CAUTION

CAUTION indicates a hazardous situation which, if not avoided, could result in minor or
moderate injury.

NOTICE

NOTICE is used to address practices not related to personal injury.

4 ST36-48US-IA-IUS112321 Installation Guide

SMA America, LLC Important Safety Instructions

Other symbols in this document

In addition to the safety and hazard symbols described on the previous pages, the following symbol
is also used in this manual:

Information

This symbol accompanies notes that call attention to supplementary information that you
must know and use to ensure optimal operation of the system.

Markings on this product

The following symbols are used as product markings with the following meanings.

Warning regarding dangerous voltage
The product works with high voltages. All work on the product must only be performed

as described in the documentation of the product.

Electric arc hazards
The product has large electrical potential differences between its conductors. Arc flashes

can occur through air when high-voltage current flows. Do not work on the product
during operation.

Beware of hot surface
The product can become hot during operation. Do not touch the product during

operation.

Observe the operating instructions
Read the documentation of the product before working on it. Follow all safety

precautions and instructions as described in the documentation.

AC current

DC current

Earth Ground

UL1741 is the standard applied by Underwriters Laboratories to the product to certify
that it meets the requirements of the NationalElectricalCode

®

, the Canadian Electrical

Code® CSA C22.1 and IEEE‑929‑2000. IEEE 929-2000 provides recommendations

regarding the proper equipment and functionality necessary to ensure compatible
operation when power generation is connected to the utility grid.

Installation Guide ST36-48US-IA-IUS112321 5

General Warnings SMA America, LLC

General warnings

General warnings

All electrical installations must be done in accordance with the local and

NationalElectrical Code

®

ANSI/NFPA 70 or the Canadian Electrical Code®
CSAC22.1. This document does not and is not intended to replace any local, state,
provincial, federal or national laws, regulation or codes applicable to the installation and
use of the product, including without limitation applicable electrical safety codes. All
installations must conform with the laws, regulations, codes and standards applicable in
the jurisdiction of installation. SMA assumes no responsibility for the compliance or
noncompliance with such laws or codes in connection with the installation of the product.

The product contains no user-serviceable parts except for the fans on the bottom of the
enclosure and the filters behind the fans as well as the handle covers on the sides of the
unit. For all repair and maintenance, always return the unit to an authorized SMA Service
Center.

Before installing or using the product, read all of the instructions, cautions, and warnings in
this manual.

Before connecting the product to the electrical utility grid, contact the local utility company.
This connection must be made only by qualified personnel.

Wiring of the product must be made by qualified personnel only.

6 ST36-48US-IA-IUS112321 Installation Guide

SMA America, LLC Table of Contents

Table of Contents

1 Notes on this manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

1.1 Validity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

1.2 Target group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

1.3 Nomenclature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2 The Sunny Tower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2.1 Appropriate usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2.2 Device overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2.3 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2.4 Type plate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

2.5 Sunny WebBox. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

3 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

4 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4.1 Required tools and materials . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4.2 Installing the Sunny Tower . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4.2.1 Foundation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4.2.2 Minimum workspace/ventilation requirements . . . . . . . . . . . . . . . . . . . . . . . 16

4.3 Installing at the site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

5 Attaching the conduits . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

5.1 Insert cables from the rear into the Sunny Tower . . . . . . . . . . . 18

5.2 Insert cables from below into the Sunny Tower . . . . . . . . . . . . 19

6 Opening and closing the Sunny Tower . . . . . . . . . . . . . . 21

6.1 Opening the Sunny Tower . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

6.2 Closing the Sunny Tower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

6.3 Opening and closing the Sunny Boy . . . . . . . . . . . . . . . . . . . . 23

7 Electrical connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Installation Guide ST36-48US-IA-IUS112321 7

Table of Contents SMA America, LLC

7.1 Connecting ground. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

7.2 Grid configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

7.3 Connecting the AC output . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

7.4 Connecting the DC Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

7.5 Installing the inverters on the Sunny Tower . . . . . . . . . . . . . . . . 32

7.6 Wiring Connections to the Sunny Boy . . . . . . . . . . . . . . . . . . . 33

7.6.1 AC Wiring of the SB 6000US/SB 7000US/SB 8000US . . . . . . . . . . . . . . 34

7.6.2 DC wiring of the SB 6000US/SB 7000US/SB 8000US. . . . . . . . . . . . . . . 37

8 Communication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

8.1 External communication device . . . . . . . . . . . . . . . . . . . . . . . . 41

8.2 Communication interface 485USPB-NR or 485USPB-SMC-NR 42

8.3 External communication device . . . . . . . . . . . . . . . . . . . . . . . . 43

8.4 Connecting another Sunny Tower. . . . . . . . . . . . . . . . . . . . . . . 44

8.5 Installing the Sunny WebBox . . . . . . . . . . . . . . . . . . . . . . . . . . 46

9 Commissioning the Sunny Tower . . . . . . . . . . . . . . . . . . . 49

10 Cleaning and maintenance . . . . . . . . . . . . . . . . . . . . . . . . 52

11 Technical data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

11.1 Sunny Tower ST36 equipped with Sunny Boy SB 6000US . . . 53

11.2 Sunny Tower ST42 equipped with Sunny Boy SB 7000US . . . 55

11.3 Sunny Tower ST48 equipped with Sunny Boy SB 8000US . . . 57

12 Contact . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

8 ST36-48US-IA-IUS112321 Installation Guide

SMA America, LLC Notes on this manual

1 Notes on this manual

This manual describes the mounting, installation and commissionig of the Sunny Tower-US ST6US,
ST36, ST42 and ST48. This manual does not cover any details concerning equipment connected to
th e Su nny Tow er. In for mat ion con cer ning t he c onn ect ed e qui pme nt i s av ailab le f rom the manuf act ure r
of the equipment.

1.1 Validity

This manual is valid for the Sunny Tower types listed below:

ST6US
ST36
ST42
ST48

In this manual the listed types above are referred to as Sunny Tower.

1.2 Target group

This manual is for qualified personnel. Qualified personnel have received training and have
demonstrated skills and knowledge in the construction and operation of the device. Qualified
personnel is trained to deal with the dangers and hazards involved in installing electric devices.

1.3 Nomenclature

In this document SMA America Production, LLC is referred to in the following as SMA.

Installation Guide ST36-48US-IA-IUS112321 9

The Sunny Tower SMA America, LLC

2 The Sunny Tower

2.1 Appropriate usage

The Sunny Tower is a mounting frame which enables you to easily install six inverters of type
SB6000US, SB 7000US or SB 8000US. The AC and DC cabling is pre-wired, as is the
communication via RS485, and the AC/DC Disconnect.

An optional Sunny WebBox allows remote monitoring of the PV plant via an internet connection.
The Sunny Tower is delivered with a base plate for easy installation.

It is prohibited:

• to use the Sunny Tower for purposes other than those described here.

• to connect voltage sources to the inverter other than those consisting of PV-modules.

• to modify the Sunny Tower or to install components that are not explicitly recommended by
SMA or sold by SMA for this purpose.

2.2 Device overview

The following figures provide you with an overview of the Sunny Tower.

Front view

Position Description

A AC/DC disconnect
BSunny Boy

10 ST36-48US-IA-IUS112321 Installation Guide

SMA America, LLC The Sunny Tower

Rear view

Position Description

A Type plate
B Service access cover
C Conduit access/mounting plate
DAir vents

Installation Guide ST36-48US-IA-IUS112321 11

The Sunny Tower SMA America, LLC

40.55 in.

57.24 in.

25.75 in.

27.4 in.

19.69 in.

35.07 in.

19.84 in.

71.3 in.

20.59 in.

35.07 in.

40.55 in.

2.3 Dimensions

12 ST36-48US-IA-IUS112321 Installation Guide

SMA America, LLC The Sunny Tower

2.4 Type plate

You can identify the Sunny Tower with the type plate. The type plate is found on the back side of the
Sunny Tower.

2.5 Sunny WebBox

The Sunny WebBox is a communication option available from SMA. It enables remote
communication with the Sunny Tower.

The Sunny WebBox power supply is available in 2 voltage ranges, one version for voltages between
120 V AC and 240 V AC, the second version for 480 V AC. Verify that you have the correct version
for the utility voltage prior to commissioning the Sunny Tower.

Communication via RS485 is pre-wired as a standard feature.

Installation Guide ST36-48US-IA-IUS112321 13

Safety SMA America, LLC

3 Safety

DANGER

Risk of electric shock due to high voltages inside the Sunny Tower.
Death or serious injuries will result.

• All work on the Sunny Tower must only be carried out by qualified personnel.

• All work on the Sunny Tower shall only be done as described in this manual.

• Pay attention to all safety instructions.

WARNING

Risk of electric shock during operation of a damaged Sunny Tower.
Death or serious injuries will result.

• The Sunny Tower may only be used when it is technically faultless and safe to
operate!

• Operate the Sunny Tower only if no damage is visibly evident!

• Visually check the Sunny Tower for damage on a regular basis!

• Ensure that all external safety features are freely accessible at all times, and that they
are regularly tested for correct functionality!

NOTICE

Electrostatic discharges possible when components are touched.
Damage to components will result.

• Follow ESD protective provisions.

• Remove existing electrostatic charges by touching a grounded metal surface (e.g.
housing).

Avoid using wire nuts to join any wires together or to make any connections anywhere in
the PV-system. Wire nuts are a frequent cause of unreliable, resistive connections, and
ground faults.

Storage of the documentation

The documentation must be kept in the immediate vicinity of the Sunny Tower. They must
be available to operators and maintenance staff at all times. Read this manual carefully.

14 ST36-48US-IA-IUS112321 Installation Guide

SMA America, LLC Installation

4 Installation

4.1 Required tools and materials

Quantity Tool/Material Purpose

1 Hammer drill with a suitable drill bit Drilling the holes for the base plate

anchors

4 Concrete anchors with a minimum

diameter of 3/8 in.

1 Allen key 0.197 in.(5 mm) Attaching the Sunny Boy wall mount

4.2 Installing the Sunny Tower

DANGER

Danger to life due to fire or explosions.
There is always a certain risk with electric devices that a fire can occur, even though

greatest attention was paid to avoiding this during the development.

• Do not install the Sunny Tower on flammable construction materials.

• Do not install the Sunny Tower in areas where highly flammable materials are stored.

• Do not install the Sunny Tower in potentially explosive areas.

Anchor the Sunny Tower base to the
concrete pad

brackets to the Sunny Tower

The information contained in this installation guide must be observed when installing the
Sunny Tower. The inverters are designed for outdoor installation and confirm to the
protection class NEMA 3R.

The correct installation of the Sunny Tower requires:

• Proper electrical connections.

• Adequate ventilation of the inverters.

• Adequate fire prevention on site.

4.2.1 Foundation

• The foundation must guarantee solid and safe positioning of the Sunny Tower.

• The foundation must provide the necessary load-carrying capacity to cope with the weight of
the fully equipped Sunny Tower up to approximately 1,430 Ibs (649 kg).

• A foundation slab is recommended for ground-mounted installations.

Pouring and structural inspection of the foundation slab should be performed on-site.

Installation Guide ST36-48US-IA-IUS112321 15

Installation SMA America, LLC

• When pouring the foundation, keep in mind that the cables and conduits should enter the Sunny
Tower from underneath. Therefore, suitable conduits or cable feed-throughs should be installed
prior to pouring.

4.2.2 Minimum workspace/ventilation requirements

Due to NEC 110.26 Work Space Requirements, a minimum of 36 in. (914 mm) of free space and
adequate ventilation must be maintained around all four sides of the Sunny Tower.

4.3 Installing at the site

WARNING

Risk of injury during transport of the Sunny Tower.
Injuries and contusion of body parts will result.

• Consider the weight of the Sunny Tower.

• Transport the Sunny Tower with four people or with a cart.

• Wear personal protective equipment.

• The Sunny Tower must be securely fastened to the floor before you begin with the installation
and cabling of the inverters.

• The Sunny Tower must be installed on a level surface. Any existing unevenness, depression, or
slope must be corrected prior to installation.

16 ST36-48US-IA-IUS112321 Installation Guide

SMA America, LLC Installation

1. Mark the positions of the base plate mounting holes on the mounting surface.

Position Description

A Drill holes for the foundation connection
B Conduit openings

2. At the marked positions, drill the holes for the anchor screws.

3. Insert the concrete anchors in the drilled holes.

4. Place the Sunny Tower bottom down on the foundation. The drill holes and the base plate holes
have to align.

5. Mount the Sunny Tower to foundation using 4 scews.

☑ The Sunny Tower is installed.

6. Remove the carrying handles by unscrewing the stainless steel screws.

Installation Guide ST36-48US-IA-IUS112321 17

Attaching the conduits SMA America, LLC

5 Attaching the conduits

This section descibes where to insert the cables in the Sunny Tower and where to punch the holes for
the conduits.

NOTICE

Moisture can seep through incorrectly installed conduits and conduit hubs.
Damage to the electronics of the Sunny Tower will result.

• For conduit hubs, use only UL listed rainproof, or wet location hubs complying with
UL 514B for entry into the enclosure.

• Adjust the diameter of the conduit hubs to match the diameter of the conduits.

The PV panel cables, the AC cables and the communication cables can be routed into the Sunny
Tower from the rear or from below. The two options are described below.

5.1 Insert cables from the rear into the Sunny Tower

1. Remove the four screws that secure the conduit
access/mounting plate to the rear of the Sunny
Tower.

2. Store the conduit access/mounting plate (3),
mounting screws and washers in a safe place while
mounting, installing or repairing the Sunny Tower.

3. Mark the holes for at least one conduit per DC
cable.

4. Mark the holes for at least one conduit per AC
cable.

5. Mark the hole for communication cable.

18 ST36-48US-IA-IUS112321 Installation Guide

SMA America, LLC Attaching the conduits

6. Punch the holes for the conduits.
Figure to the right: Example for a plate with

conduits.
A: Conduit for AC cables.
B: Conduit for communication cables.
C: Conduit for DC cables.

7. Insert the PV-generator cables, the AC cables and
the data cables into the Sunny Tower from the rear.
A conduit access/mounting plate is attached to the
Sunny Central for this purpose.

8. Attach the plate to the Sunny Tower.

9. Attach the screws and washers and tighten with a
torque of 53inlbs (6Nm).

10. Insert the conduits into the openings.

11. Attach the conduits with the appropriate hubs.

12. Insert the cables into the Sunny Tower.
☑ The cables are inserted.

5.2 Insert cables from below into the Sunny Tower

1. Insert the following cables into the Sunny Tower from the bottom through the foundation:

– PV-Generator cables.
– AC cables.
– Data cables.

There are four openings in the base of the Sunny Tower through which the cables can be inserted into
the Sunny Tower. Two aluminum sheets are attached above the openings.

Installation Guide ST36-48US-IA-IUS112321 19

Attaching the conduits SMA America, LLC

2. Remove the six screws that secure the aluminum

sheets to the bottom of the Sunny Tower.

3. Store the aluminum sheets, mounting screws and

washers in a safe place.

4. Place the Sunny Tower with the openings above the

cable conduits onto the base.

5. Fasten the Sunny Tower to the base as d escribed in

section 4.3 „Installing at the Location”.

6. Seal the Sunny Tower to the base.

Without

• Seal the openings down to the base.
aluminum
sheet.

With aluminum
sheet.

• Punch holes for the conduits.

Figure to the right: Example for
plates with conduits.

A: Conduit for AC cables.
B: Conduit for communication

cables.
C: Conduit for DC cables.

• Insert the conduits into the openings.

• Attach the plate to the bottom of the Sunny Tower.

• Attach the screws and washers and tighten with a torque of 53 in-lbs (6 Nm).

• Attach the conduits with the appropriate hubs.

7. Insert the cables into the Sunny Tower.
☑ The cables are inserted.

20 ST36-48US-IA-IUS112321 Installation Guide

SMA America, LLC Opening and closing the Sunny Tower

6 Opening and closing the Sunny Tower

6.1 Opening the Sunny Tower

DANGER

Risk of electric shock due to high voltage inside the Sunny Tower.
Death and burning resulting from electric shock.

• All procedures described in this section shall only be conducted by qualified
personnel.

• Observe the sequence described here when opening the Sunny Tower.

• If problems occur when performing the work described here, contact SMA.

1. Disconnect the AC side of the Sunny Tower.

2. Disconnect the DC side of the inverters.

3. Ensure that LEDs and Display are off.

CAUTION

Components inside the Sunny Tower become hot during operation.
Danger of burn injury.

• Wait for the Sunny Tower to cool down for at least 30 minutes.

• Wear protective gloves when working on the Sunny Tower.

Installation Guide ST36-48US-IA-IUS112321 21

Opening and closing the Sunny Tower SMA America, LLC

Opening the service access cover

1. Loosen the screws (1).

2. Remove the top middle screw of the service access cover (2). Put it aside.

3. Push the service access cover upwards (3).

4. Remove the service access cover (4).

5. Remove the grounding cable from the service access cover.

6. Store the service access cover, mounting screws and washers in a safe place while mounting,
installing or repairing the Sunny Tower.

☑ The service access cover is open.

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SMA America, LLC Opening and closing the Sunny Tower

6.2 Closing the Sunny Tower

Closing the service access cover

1. Fit the grounding cable back to the service access cover.

2. Place the service access cover over the screws (1).

3. Push down the service access cover (2).

4. Fasten the top middle screw of the service access cover (3).

5. Tighten all screws (4).

☑ The service access cover is closed.

6.3 Opening and closing the Sunny Boy

Refer to the SB 6000US/SB 7000US/SB 8000US installation guide.

Installation Guide ST36-48US-IA-IUS112321 23

Electrical connection SMA America, LLC

7 Electrical connection

Refer to the table below for the appropriate wire sizes and torque values.

Terminal Wire Size Wire type Torque

DC Terminal Blocks (PV-

return or PV grounded

conductors)

DC Fuse Holder (PV-hot

or PV ungrounded

conductors)

AC Terminal Blocks 350 kcmil...3/0 AWG 600 V minimum rated 194°F

Primary protective

earthing terminal

Inverter protective

earthing terminal

Cover Screws — — 53 lbsin

6...2AWG 600V minimum rated 194°F

(90°C); copper or copper clad

conductors only

14...8AWG 600V minimum rated 194°F

(90 °C); copper or copper clad

conductors only

16...10AWG 600 V minimum rated 194°F

(90 °C); copper or copper clad

conductors only

(90 °C); copper or copper clad

conductors only

2/0...1AWG 600V minimum rated 194°F

(90 °C); copper or copper clad

conductors only

6...2AWG 600V minimum rated 194°F

(90 °C); copper or copper clad

conductors only

14...8AWG 600V minimum rated 194°F

(90 °C); copper or copper clad

conductors only

2/0...2AWG 600V minimum rated 194°F

(90 °C); copper or copper clad

conductors only

6...14AWG 600V minimum rated 194°F

(90 °C); copper or copper clad

conductors only

80lbsin

(9Nm)

35 lbsin
(3.9Nm)

19 lbsin
(2.2Nm)

200 lbsin

(22.6Nm)

100 lbsin

(11.4Nm)

80 lbsin

(9Nm)

35 lbsin
(3.9Nm)

89 lbsin
(10Nm)

27 lbsin

(3Nm)

(6Nm)

24 ST36-48US-IA-IUS112321 Installation Guide

SMA America, LLC Electrical connection

7.1 Connecting ground

The diagram below shows the equipment grounding terminals of the Sunny Tower. They are located
on the lower right side underneath the DC connections inside the SunnyTower.

• The minimum size for the primary grounding electrode conductor is 6AWG.

• The minimum size for the individual inverter grounding electrode conductors is 8AWG.

Installation Guide ST36-48US-IA-IUS112321 25

Electrical connection SMA America, LLC

7.2 Grid configuration

Configurate the AC fuses inside of the Sunny Tower to use different grid types for the Sunny Tower.
Refer to the yellow labels which are directly located on the AC fuse holders for detail information.
Configurate the Sunny Boys as described in the Sunny Boy installation guide.

The following figures show possible grid configurations for the Sunny Tower.

208 V WYE, available for ST36 and ST42

240 V Delta, available for ST36, ST42 and ST48

26 ST36-48US-IA-IUS112321 Installation Guide

SMA America, LLC Electrical connection

480 V WYE, available for ST36, ST42 and ST48

Installation Guide ST36-48US-IA-IUS112321 27

Electrical connection SMA America, LLC

7.3 Connecting the AC output

AC Fuse

When inserting the fuses provided with the ST36/ST42/ST48 you must consider the local
grid configuration and voltage! If the Sunny Tower is to be used in a 480/277 volt
installation, the fuses for the L2 connections of each inverter must not be installed. These
fuse holders are marked with yellow warning labels on the fuse holders inside the Sunny
Tower.

Maximum Inverter AC output fuse size is 50 A, Fuse must be fast acting Class J
(forexample: Ferraz A4J50, Bussman JKS-50, Littelfuse JLS-50).

Ensure that the Sunny Tower is properly grounded and the bonding of your equipment is
in accordance with NEC articles 250 and 690.

AC-output/neutral is not bonded to ground!

1. Turn OFF the main breaker in the main utility box.

2. Ensure that the correct breaker sizes specified in the table below are installed.

Inverter Type Grid Configuration Breaker Size

SB 8000US 480 V/277 V 80 A
SB 8000US 240 V 150 A
SB 7000US 480 V/277 V 70 A
SB 7000US 208 V/120 V 150 A
SB 7000US 240 V 150 A
SB 6000US 480 V/277 V 60 A
SB 6000US 208 V/120 V 125 A
SB 6000US 240 V 110 A

Ensure that conductors are sized in accordance with NEC article 310.

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The inscription goes from left to right.

Position Description

Ø Connection terminal for the grid connection to XA (L1)
Ø Connection terminal for the grid connection to XB (L2)
Ø Connection terminal for the grid connection to XC (L3)
N Connection terminal for the grid connection to N (neutral)

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Electrical connection SMA America, LLC

7.4 Connecting the DC Input

DANGER

Voltage is present in PV-modules exposed to light.
Risk of electric shock when touching the DC cable attached to a PV-module.
Death and burn injuries will result.

• Cover the PV-modules with opaque material.

• Follow all safety precautions of the module manufacturer.

Make sure that your cable has sufficient length.

1. Open the fuse switch of each individual safety device.

PV array wiring can enter the tower enclosure from below or through the cable access
cover. If necessary use an appropriate knock out punch to create knockouts for the array
conduits.

2. Connect the PV array wiring to the string fuse holders as shown below.

PV str ing con duc tor s sh ould be su ppo rte d us ing the cab le t ie t abs near the inputs of the fuse
holders and terminal blocks.

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Position Installed Sunny Boy PV Connection

A Sunny Boy 1 PV return
B Sunny Boy 1 PV hot

C Sunny Boy 2 PV return

D Sunny Boy 2 PV hot
E Sunny Boy 3 PV return

F Sunny Boy 3 PV hot
G Sunny Boy 4 PV hot
H Sunny Boy 4 PV return

I Sunny Boy 5 PV hot

K Sunny Boy 5 PV return

L Sunny Boy 6 PV hot
M Sunny Boy 6 PV return

3. PV hot (PV ungrounded) conductors should be connected to the fuse holders.
PV return (PV grounded) conductors should be connected to the associated terminal blocks.

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Electrical connection SMA America, LLC

DC Fuse

The maximum allowable fuse size for the DC string fuses is 20A. Fuse must be fast acting.
Fuses are provided with the Sunny Tower. The proper size PV string fuse is determined by

1.56 x Isc (of the PV module) and then rounding up to the next standard fuse size.
Example: If the Isc of the PV module = 6.9 Adc then the fuse size is determined by

1.56x6.9=10.76. The next standard fuse size would be 12A, 600Vdc fuse.
The string fuse size must not be greater than the maximum fuse size rating of the PV mo dule.

7.5 Installing the inverters on the Sunny Tower

The Sunny Tower must be securely fastened to the floor prior to installing and connecting
the inverters.

Installing the mounting brackets (A) for the Sunny Boy

1. Hold the mounting bracket (A) over the corresponding screw anchor holes of the Sunny Tower.

2. Fasten the mounting bracket (A) using the metric threaded stainless steel screws (M8x16mm
with corresponding locking washers) provided with the Sunny Tower.

3. Perform these steps again for installing the remaining mounting brackets.

4. Refer to the SB 6000US/SB 7000US/SB 8000US manual for further installation instructions.

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7.6 Wiring Connections to the Sunny Boy

The AC and DC system cables are already pre-wired to the inverter mounting locations of the Sunny
Tower.

Position Description

ADC cable
BAC cable

CAC/DC Disconnect

D Communicaton cable

In addition to this manual, refer to the SB 6000US/SB 7000US/SB 8000US manual for instructions
on wiring the AC and DC cables inside the inverters and configuring the AC voltage of the inverter.
Information on this subject can be read in the appropriate section.

The AC/DC disconnect serves to simultaneously disconnect the AC and DC connections.

The DC inp ut and AC output circ uits are isolated from the enclosure and system grounding.
If an alternative grounding scheme is required, it is the responsibility of the installer.

The PV-system grounding shall be installed per the requirements of sections 690.41
through 690.47 of the National Electric Code, ANSI/NFPA 70, and is the responsibility
of the installer.

The National Electrical Code, ANSI/NFPA 70, wiring methods are to be used.

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Electrical connection SMA America, LLC

Appropriate torque values and wire sizes

Terminal Nm inIbs Wire Size

AC & DC Terminal Blocks 2 18 10...6AWG

Unused Terminal Block for

AC Configuration

Cover Screws 6 53 —

1.3 11 —

7.6.1 AC Wiring of the SB 6000US/SB 7000US/SB 8000US

DANGER

High voltages are present on the AC and DC cables. Risk of electric shock.
Death or serious injuries will result when touching voltage-conducting cables and contacts.

• All procedures described in this section shall only be conducted by qualified
personnel.

• Observe the sequence described here when opening the Sunny Boy.

Routing the AC cable into the Sunny Boy

1. Refer to the Sunny Boy installation guide for opening the Sunny Boy.

2. Remove a membrane at the bottom of the inverter.

3. Pull the cable conduit from below into the Sunny
Boy.

4. Tighten the conduit with the locknut from the inside
of the inverter.

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AC wiring for 208 V/240 V grid configuration

1. Connect the white wire of the AC/DC disconnect to the terminal labeled N and the black wire
to the terminal labeled L1 of the Sunny Boy.

2. connect the blue wire to the terminal labeled L2 in the Sunny Boy.

Position Description

A Black wire connected to L1 terminal
B Blue wire connected to L2 terminal

C White wire connected to N terminal

3. Connect the wires to the terminal blocks in the Sunny Boy and tighten to a torque of 18inlb
(2Nm).

4. Verify that all connections are correctly wired and properly torqued.

☑ The Sunny Boy is connected to the 208V/240V grid.

5. Repeat steps 1 to 4 for the AC wiring of the remaining Sunny Boy inverters.

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Electrical connection SMA America, LLC

AC wiring for 277V/480V grid configuration

1. Connect the white wire of the AC/DC disconnect to the terminal labeled N and the black wire
to the terminal labeled L1 of the Sunny Boy.

2. For 277V/480V connect the blue wire to the terminal labeled PE in the Sunny Boy (not used).

Position Description

A Blue wire connected to PE terminal
B Black wire connected to L1 terminal

C White wire connected to N terminal

3. Connect the wires to the terminal blocks in the Sunny Boy and tighten to a torque of 18inlb
(2Nm).

4. Verify that all connections are correctly wired and properly torqued.

☑ The Sunny Boy is connected to the 277V/480V grid.

5. Repeat steps 1 to 4 for the AC wiring of the remaining Sunny Boy inverters.

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7.6.2 DC wiring of the SB 6000US/SB 7000US/SB 8000US

The Sunny Boy is configured for negative ground systems. Certain types of PV modules may require
that the positive terminal be grounded instead of the negative terminal. To configure the Sunny Boy
for positive ground, move the fuse (1) and change the jumper position (2) as shown in the following
illustrations.

Negative grounding

Following figure shows GFDI Fuse and Jumper Settings for negative grounding.

Positive grounding

Following figure shows GFDI Fuse and Jumper Settings for positive grounding.

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Electrical connection SMA America, LLC

Routing the DC cable into the Sunny Boy

1. Refer to the Sunny Boy installation guide for opening the Sunny Boy.

2. Remove a membrane at the bottom of the inverter.

3. Pull the cable conduit from below into the Sunny
Boy.

4. Tighten the conduit with the locknut from the inside
of the inverter.

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Negative grounding

Following figure shows the DC connection with negative grounding.

Position Description

A White wire (PV RETURN) connected to DC −
B Black wire (PV HOT) connected to DC+

1. Connect the black wire (PV HOT) to the terminal labeled DC+ in the Sunny Boy.

2. Connect the white wire (PV RETURN) to the terminal labeled DC − in the Sunny Boy.

3. Torque all wires in the terminal blocks inside the Sunny Boy to 18inlb (2Nm).

4. Verify that all connections are correctly wired and properly torqued.

☑ The Sunny Boy is DC wired with negative grounding.

5. Repeat steps 1 to 4 for DC wiring with negative grounding for the remaining Sunny Boy
inverters.

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Electrical connection SMA America, LLC

Positive grounding

Following figure shows the DC connection with positive grounding.

Position Description

A White wire (PV RETURN) connected to DC+
B Black wire (PV HOT) connected to DC −

Avoid using wire nuts to join any wires together or to make any connections anywhere in
the PV system. Wire nuts are a frequent cause of unreliable connections, resistive
connections, and ground faults.

1. Connect the white wire (PV RETURN) to the terminal labeled DC+ in the Sunny Boy.

2. Connect the black wire (PV HOT) to the terminal labeled DC − in the Sunny Boy.

3. Torque all wires in the terminal blocks inside the Sunny Boy to 18inlb (2Nm).

4. Verify that all connections are correctly wired and properly torqued.

☑ The Sunny Boy is DC wired with positive grounding.

5. Repeat steps 1 to 4 for DC wiring with negative grounding for the remaining Sunny Boy
inverters.

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8 Communication

The communication cables must be wired in separate conduits or raceways and must be
isolated from the power lines!

For detail information on communication, refer to the SB 6000US/SB 7000US/SB 8000US and the
Sunny WebBox installation guide.

• If ordered, the Sunny WebBox is already installed inside the Sunny Tower.

• Connec t the communication cables to each installed Sunny Boy. Connect other bus participants
to the communication distributor.

• The communication distributor is situated inside the Sunny Tower.

8.1 External communication device

To connect an external communication device to the communication bus of the Sunny Tower simply
connect the RS485 cable to the RJ45 socket as you can see below.

Position Description

A Socket for external communication device
B Socket for additional bus participant or termination resistor

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Communication SMA America, LLC

8.2 Communication interface 485USPB-NR or 485USPB-SMC-NR

For installing the communication interface 485USPB-NR or 485USPB-SMC-NR refer to the
appropriate installation guide.

Position Description

A Cable routing
B Male connector for PE

C Openings for communication cabling conduits

D Screw terminals for connecting the communication cabling
EJumper slot

FInterface slot

Signal Conductor color Screw terminal of the inverter (D)

Data+ White, green 2
Data − Brown, yellow 7
GND Grey 5

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screen

1

8

8.3 External communication device

To connect an external communication device to the communication bus of the Sunny Tower simply
connect the RS485 cable to the RJ45 socket as you can see below.

Position Description

A Socket for additional bus participant or termination resistor
B External communication device

Pin configuration from RJ45-plug:

PIN 1= Data ­PIN 2= GND
PIN 3= Data +

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Communication SMA America, LLC

8.4 Connecting another Sunny Tower

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Position Description

A RJ45 socket for Sunny WebBox or external communication device
B Connection to next Sunny Tower

C Termination resistor location

1. Remove and save the bus termination resistor in the first Sunny Tower.

2. Connect a patch cable (RJ45 plug) to the place of the removed bus termination resistor.

3. Route the cable to the second Sunny Tower.

4. In the second Sunny Tower place the bus termination resistor in the appropriate RJ45 socket, if
not already present.

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Communication SMA America, LLC

8.5 Installing the Sunny WebBox

The connection of the communication cable to the Sunny Boy is described in detail in the
installation guide of the Sunny Boy and the communication device.

• Refer to the appropriate section of these manuals.

The optional Sunny WebBox is installed inside of the Sunny Tower.
The communication cables from the WebBox to each Sunny Boy are already pre-installed.
Proceed as follows:

1. Remove the clear cover of the WebBox housing.

2. Remove the square plug of the cable entry in the WebBox housing.

3. Place the square plug over the Ethernet cable.

4. Insert the square plug with the Ethernet cable into the cable entry of the WebBox housing.

5. Attach the Ethernet cable to the WebBox.

6. Install the clear cover on the WebBox housing.

Route the Ethernet cable parallel to the communication lines, further into the right front corner, then
downward to the cable entry of the Sunny Towers.

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Sunny WebBox 120V...240V version

Position Description

A AC cable to Sunny Tower
B RS485 cable to communication distribution

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Communication SMA America, LLC

Sunny WebBox 480V version

Position Description

A AC cable to Sunny Tower
B RS485 cable to communication distribution

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9 Commissioning the Sunny Tower

Requirements for the initial start-up

NOTICE

Risk of overvoltage.
Damage to connected PV-modules and fuses will result.

• Ensure the correct polarity of each DC cable connected to the Sunny Tower.

• Ensure the correct DC fuse size regarding the grid configuration.

1. Check the AC main connection inside the Sunny Tower for a clockwise rotating field.
– Use a rotating field instrument for checking.

2. Proceed with commissioning the Sunny Tower only after:
– The housing covers on the SB 6000US/SB 7000US/SB 8000US inverters are closed.
– The DC cables are connected correctly.
– The AC cable is connected correctly.
– All conduit fittings are secured.

3. Verify the functionality of the AC/DC disconnect. Operate each AC/DC disconnect for
10times as follows:

– Turn from position “0“ (off) to position “1“ (on).
– Turn back from position “1“ (on) to position “0“ (off).

4. Switch on the breaker of the AC distribution panel, connecting the Sunny Tower to the grid.

5. Verify the correct voltage range at the grid connection terminals, 208V, 240V or 277V/
480V. See section 7.2 for details.

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Commissioning the Sunny Tower SMA America, LLC

Inserting the fuses for 208V/240V grid configuration

1. Turn each AC/DC disconnector to "0" (off).

2. If the Sunny Tower is to be used in a 208V/240V installation insert both fuses.

3. Ensure that all DC string fuse holders are closed.

Inserting the fuses for 277V/480V grid configuration

When inserting the fuses provided with the Sunny Tower, you must consider the local grid
configuration and voltage! If the Sunny Tower is to be used in a 277V/480V installation,
the fuses for the L2 connections of each inverter must not be installed. These fuse holders
are marked with yellow warning labels on the fuse holders inside the Sunny Tower.

Maximum Inverter AC output fuse size is 50A, Fuse must be fast acting Class J (for
example: Ferraz A4J50, Bussman JKS-50, Littelfuse JLS-50).

1. Turn each AC/DC disconnector to "0" (off).

2. If the Sunny Tower is to be used in a 277V/480V installation insert one fuse only.

3. Ensure that all DC string fuse holders are closed.

T

The maximum allowable fuse size for the DC string fuses is 15 amps. Fuse must be fast
acting (for example: Ferraz ATM15, Bussman KTK15, Littelfuse KLK15).

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Closing the service access cover and starting the Sunny Tower

1. Fit the grounding cable back to the service access cover.

2. Place the service access cover over the screws (1).

3. Push down the service access cover (2).

4. Fasten the top middle screw of the service access cover (3).

5. Tighten all screws (4).
☑ The service access cover ist installed.

6. One after another switch on the AC/DC disconnector of each Sunny Boy to "1" (on).

7. Check the green LED on each Sunny Boy, to ensure that each one is operating correctly.

If the Sunny Boy displays other messages or blink codes, refer to the SB 6000US/
SB7000US/SB 8000US manual for trouble shooting information.

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Cleaning and maintenance SMA America, LLC

10 Cleaning and maintenance

Remove dirt and dust from the air vents (A) of the Sunny Tower once a year. If the Sunny Tower is
operated in areas with a high amount of dust or dirt check the air vents for dirt more frequently.

• Use vacuum cleaner for cleaning the air vents.

• Additionally use a soft brush in order to loosen the dust or dirt.

• Make sure that no loose dust or dirt gets inside the Sunny Tower.

To ensure the proper operation of the SunnyTower operate each AC/DC disconnect at least once a
year for 10times as follows:

1. Turn from position “0“ (off) to position “1“ (on).

2. Turn back from position “1“ (on) to position “0“ (off).

3. Repeat steps 1 and 2 with the remaining AC/DC disconnectors.

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11 Technical data

11.1 Sunny Tower ST36 equipped with Sunny Boy SB 6000US

PV generator connection

Recommended Maximum PV Power
(ModuleSTC)

DC Maximum Voltage 600V
Peak Power Tracking Voltage 250V...480V
DC Maximum Input Current 150A
Number of Fused String Inputs

(AC‑DCdisconnect)
Fuse Size 15A
PV Start Voltage (Adjustable) 300V
Power Factor (Nominal) 0.99

45 kW

24

Grid connection

AC Nominal Power 36.0kW
AC Maximum Power 36.0kW
AC Maximum Output Current at 208 V

(3‑PhaseOnly)
AC Maximum Output Current at 240 V

(3‑PhaseOnly)
AC Maximum Output Current at 277 V

(3‑PhaseOnly)
AC Nominal Voltage Range at 208 V Delta or

WYE (3‑PhaseOnly)
AC Nominal Voltage Range at 240 V Delta

(3‑PhaseOnly)
AC Nominal Voltage Range at 277 V WYE

(3‑PhaseOnly)
AC Frequency Nominal 60Hz
AC Frequency Range 59.3Hz...60.5Hz
Power consumption at night 0.6W

100A

87A

44A

187V...229V

211V...264V

244V...305V

Efficiency

Peak Inverter Efficiency 97.0%
CEC Weighted Efficiency at 208 V/240 V 95.5%
CEC Weighted Efficiency at 277 V 96.0%

Installation Guide ST36-48US-IA-IUS112321 53

Technical data SMA America, LLC

Ambient conditions

Ambient Temperature Range − 13°F...+113°F

( − 25°C...+45°C)

Mechanical data

WidthxHeightxDepth 43.3inx70.5inx39in

(1.100mmx1.791mmx991mm)
Tower Weight 330lbs(150kg)
6 Inverters Weight 846lbs(384kg)
Total Shipping Weight 1.388lbs(630kg)

Features

Topology LF transformer
Sunny Boy coolingconcept OptiCool ™ , forced active cooling
RS485 communication yes
Wireless communication optional
LCD display yes

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11.2 Sunny Tower ST42 equipped with Sunny Boy SB 7000US

PV generator connection

Recommended Maximum PV Power
(ModuleSTC)

DC Maximum Voltage 600V
Peak Power Tracking Voltage 250V...480V
DC Maximum Input Current 180A
Number of Fused String Inputs

(AC‑DCdisconnect)
PV Start Voltage (Adjustable) 300V
Power Factor (Nominal) 0.99

52.5 kW

24

Grid connection

AC Nominal Power 42.0kW
AC Maximum Power 42.0kW
AC Maximum Output Current at 208 V

(3‑PhaseOnly)
AC Maximum Output Current at 240 V

(3‑PhaseOnly)
AC Maximum Output Current at 277 V

(3‑PhaseOnly)
AC Nominal Voltage Range at 208 V Delta or

WYE (3‑PhaseOnly)
AC Nominal Voltage Range at 240 V Delta

(3‑PhaseOnly)
AC Nominal Voltage Range at 277 V WYE

(3‑PhaseOnly)
AC Frequency Nominal 60Hz
AC Frequency Range 59.3Hz...60.5Hz
Power consumption at night 0.6W

117A

101A

51A

187V...229V

211V...264V

244V...305V

Efficiency

Peak Inverter Efficiency 97.1%
CEC Weighted Efficiency at 208 V 95.5%
CEC Weighted Efficiency at 240 V/277 V 96.0%

Ambient conditions

Ambient Temperature Range − 13°F...+113°F

( − 25°C...+45°C)

Installation Guide ST36-48US-IA-IUS112321 55

Technical data SMA America, LLC

Mechanical data

WidthxHeightxDepth 43.3inx70.5inx39in

(1.100mmx1.791mmx991mm)
Tower Weight 330lbs(150kg)
6 Inverters Weight 846lbs(384kg)
Total Shipping Weight 1.388lbs(630kg)

Features

Topology LF transformer
Sunny Boy cooling concept OptiCool ™ , forced active cooling
RS485 communication yes
Wireless communication optional
LCD display yes

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11.3 Sunny Tower ST48 equipped with Sunny Boy SB 8000US

PV generator connection

Recommended Maximum PV Power
(ModuleSTC)

DC Maximum Voltage 600V
Peak Power Tracking Voltage 300V ...480V
DC Maximum Input Current 180A
Number of Fused String Inputs

(AC‑DCdisconnect)
PV Start Voltage (Adjustable) 365V
Power Factor (Nominal) 0.99

60kW

24

Grid connection

AC Nominal Power 48.0kW
AC Maximum Power 48.0kW
AC Maximum Output Current at 208 V

(3‑PhaseOnly)
AC Maximum Output Current at 240 V

(3‑PhaseOnly)
AC Maximum Output Current at 277 V

(3‑PhaseOnly)
AC Nominal Voltage Range at 208 V Delta or

WYE (3‑PhaseOnly)
AC Nominal Voltage Range at 240 V Delta

(3‑PhaseOnly)
AC Nominal Voltage Range at 277 V WYE

(3‑PhaseOnly)
AC Frequency Nominal 60Hz
AC Frequency Range 59.3Hz...60.5Hz
Power consumption at night 0.6W

N/A

116A

58A

N/A

211V...264V

244V...305V

Efficiency

Peak Inverter Efficiency 96.5%
CEC Weighted Efficiency at 208 V N/A
CEC Weighted Efficiency at 240 V/277 V 96.0%

Ambient conditions

Ambient Temperature Range − 13°F...+113°F

( − 25°C...+45°C)

Installation Guide ST36-48US-IA-IUS112321 57

Technical data SMA America, LLC

Mechanical data

WidthxHeightxDepth 43.3inx70.5inx39in

(1.100mmx1.791mmx991mm)
Tower Weight 330lbs(150kg)
6 Inverters Weight 888lbs(403 kg)
Total Shipping Weight 1.430lbs(649kg)

Features

Topology LF transformer
Sunny Boy cooling concept OptiCool ™ , forced active cooling
RS485 communication yes
Wireless communication optional
LCD display yes

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SMA America, LLC Contact

12 Contact

If you have technical problems concerning our products, contact the SMA Serviceline. We require the
following information in order to provide you with the necessary assistance:

• Serial number of the Sunny Tower.

• Type of inverters connected to the Sunny Tower.

• Serial numbers of the inverters connected to the Sunny Tower.

• Type and number of PV-modules connected to the Sunny Tower.

• Communication devices connected to the Sunny Tower.

• Blink codes or display messages of the connected inverters.

•Communication method.

SMA Solar Technology America, LLC

6020 West Oaks Blvd, Ste 300
Rocklin, CA 95765
Tel. [phone]
Tel. +1 877-MY SMA TECH
Tel. [phone] (Toll free, available for USA, Canada and Puerto Rico)
Fax [phone]
[e-mail]
www.SMA-America.com

SMA Solar Technology Canada Inc.

2425 Matheson Blvd E, 8th Floor
Mississauga, ON L4W 5K5, Canada
Tel. [phone] (Toll free, available for Canada)
[e-mail]
www.SMA-Canada.ca

Installation Guide ST36-48US-IA-IUS112321 59

4.""NFSJDB--$

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