SMA Sunny Boy SB 5000US User manual

SB50US-80US-eng-IUS112633 | TBUS-SB50_60_70US | Version 3.3
CA
US
PV Inverter
SUNNY BOY 5000-US / 6000-US / 7000-US / 8000-US
Installation Guide

SMA America, LLC Legal Restrictions
Installation Guide SB50US-80US-eng-IUS112633 3
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

Important Safety Instructions SMA America, LLC
4 SB50US-80US-eng-IUS112633 Installation Guide
IMPORTANT SAFETY INSTRUCTIONS
SAVE THESE INSTRUCTIONS
This manual contains important instructions for the following products:
•Sunny Boy
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.

SMA America, LLC Important Safety Instructions
Installation Guide SB50US-80US-eng-IUS112633 5
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:
Markings on this product
The following symbols are used as product markings with the following meanings.
Information
This symbol accompanies notes that call attention to supplementary information that you
must know and use to ensure optimal operation of the system.
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.
This inverter is evaluated to UL 1741, which includes assessment to all of the
requirements of IEEE1547 and IEEE1547.1, which are an outgrowth and further
development of the IEEE recommended practices and guidelines contained in IEEE Std.
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. The inverter is additionally evaluated to the
NationalElectricalCode® and the Canadian Electrical Code® CSA C22.2 No.
107.1‑1.

General Warnings SMA America, LLC
6 SB50US-80US-eng-IUS112633 Installation Guide
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.

SMA America, LLC Table of Contents
Installation Guide SB50US-80US-eng-IUS112633 7
1 Information on this Guide . . . . . . . . . . . . . . . . . . . . . . . . . 11
1.1 Validity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
1.2 Target Group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
1.3 Storing the Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
1.4 Additional Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
1.5 Nomenclature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.1 Appropriate Usage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.2 Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.3 Installation Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3 Unpacking and Inspection. . . . . . . . . . . . . . . . . . . . . . . . . 16
3.1 Scope of Delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4 AC Voltage Configuration . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.1 Opening the Sunny Boy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.2 Locating Internal Component Parts . . . . . . . . . . . . . . . . . . . . . . 19
4.3 AC Voltage Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.4 Jumper for System Configuration . . . . . . . . . . . . . . . . . . . . . . . 23
5 Mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5.1 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5.2 Requirements for the Mounting Location. . . . . . . . . . . . . . . . . . 26
5.3 Mounting with Wall Mounting Bracket. . . . . . . . . . . . . . . . . . . 28
5.3.1 Possibilities for Mounting the Wall Mounting Bracket. . . . . . . . . . . . . . . . . . 30
5.3.2 Mounting the Wall Mounting Bracket. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
5.3.3 Mounting the SMA DC Disconnect. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
5.3.4 Mounting the Sunny Boy on a Wall Mounting Bracket . . . . . . . . . . . . . . . . 33
6 Electrical Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
6.1 Connection Area of the Sunny Boy. . . . . . . . . . . . . . . . . . . . . . 36

Table of Contents SMA America, LLC
8 SB50US-80US-eng-IUS112633 Installation Guide
6.1.1 Wiring without SMA DC Disconnect. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
6.1.2 Wiring with SMA DC Disconnect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
6.2 Opening the Sunny Boy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
6.3 Opening the SMA DC Disconnect . . . . . . . . . . . . . . . . . . . . . . 39
6.4 AC Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
6.4.1 AC Connection Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
6.4.2 AC Connection without SMA DC Disconnect . . . . . . . . . . . . . . . . . . . . . . . . 41
6.4.3 AC Wiring with SMA DC Disconnect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
6.5 DC Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
6.5.1 DC Connection Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
6.5.2 DC Input Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
6.5.3 DC Wiring without SMA DC Disconnect . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
6.5.4 DC Wiring with SMA DC Disconnect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
6.5.5 DC Connection with Additional DC Distribution . . . . . . . . . . . . . . . . . . . . . . 56
6.6 Communication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
6.7 Closing the Sunny Boy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
6.8 Closing the SMA DC Disconnect . . . . . . . . . . . . . . . . . . . . . . . 59
7 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
8 Displays and Messages. . . . . . . . . . . . . . . . . . . . . . . . . . . 62
8.1 LED Operation Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
8.2 LED Fault Indicators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
8.3 Status Messages on the LCD Display . . . . . . . . . . . . . . . . . . . . 70
8.3.1 LCD Display Language Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
8.4 Measuring Channels and Parameters. . . . . . . . . . . . . . . . . . . . 72
8.4.1 Measuring Channels. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
8.4.2 Operating Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
8.4.3 Operating Parameters of the Sunny Boy. . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
8.4.4 Operating Parameters of the Sunny Boy. . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
8.4.5 Fixed Operating Parameters of the Sunny Boy . . . . . . . . . . . . . . . . . . . . . . . 77

SMA America, LLC Table of Contents
Installation Guide SB50US-80US-eng-IUS112633 9
9 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
9.1 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
9.2 Error Messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
10 Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
10.1 Cleaning the Fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
10.2 Cleaning the Handle Covers . . . . . . . . . . . . . . . . . . . . . . . . . . 82
10.3 Checking the DC Disconnect . . . . . . . . . . . . . . . . . . . . . . . . . . 82
10.4 Checking the Fans. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
10.5 Exchanging the Fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
10.5.1 Exchanging the GFDI Fuse within the Sunny Boy . . . . . . . . . . . . . . . . . . . . . 85
10.5.2 Exchanging PV String Fuses within the SMA DC Disconnect . . . . . . . . . . . . 86
11 Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
11.1 FCC Compliance Information . . . . . . . . . . . . . . . . . . . . . . . . . . 88
11.2 Sunny Boy Circuit Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
11.2.1 Without SMA DC Disconnect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
11.2.2 With SMA DC Disconnect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
11.3 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
11.4 Sunny Boy 5000-US (SB 5000US and SB 5000US-11). . . . . 91
11.5 Sunny Boy 6000-US (SB 6000US and SB 6000US-11). . . . . 93
11.6 Sunny Boy SB 7000-US (SB 7000US and SB 7000US-11) . . 95
11.7 Sunny Boy SB 8000-US (SB 8000US and SB 8000US-11) . . 97
11.7.1 SMA DC Disconnect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
11.8 Trip Limits/Trip Times. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
11.9 Torque Values and Cable Sizes . . . . . . . . . . . . . . . . . . . . . . . 100
12 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
13 Contact . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

SMA America, LLC Information on this Guide
Installation Guide SB50US-80US-eng-IUS112633 11
1 Information on this Guide
1.1 Validity
This guide describes the mounting, installation, commissioning and maintenance of the following SMA
inverters:
• Sunny Boy 5000-US (SB 5000US and SB 5000US-11)
• Sunny Boy 6000-US (SB 6000US and SB 6000US-11)
• Sunny Boy 7000-US (SB 7000US and SB 7000US-11)
• Sunny Boy 8000-US (SB 8000US and SB 8000US-11)
This guide does not contain any information on the devices that are connected to the Sunny Boy.
Information concerning the connected devices is available from the manufacturers of the devices.
1.2 Target Group
This guide is for qualified personnel. Qualified personnel have received training and have
demonstrated skills and knowledge in the construction and operation of this device. Qualified
personnel are trained to deal with the dangers and hazards involved in installing electric devices.
1.3 Storing the Documentation
Store all manuals for the Sunny Boy in such a way that they may be accessed at any time.
1.4 Additional Information
Additional information on specific topics can be found in the download area at
www.SMA‑America.com.
1.5 Nomenclature
In this document, SMA America Production, LLC and SMA Solar Technology Canada Inc. will be
referred to as SMA.

Safety SMA America, LLC
12 SB50US-80US-eng-IUS112633 Installation Guide
2Safety
2.1 Appropriate Usage
The Sunny Boy is a PV inverter which converts the DC current of the PV array to AC current and feeds
it into the power distribution grid. The Sunny Boy is suitable for use with fuel cells, small wind power
plants and other DC current sources. The Sunny Boy takes the current from a DC source and converts
it into AC power for the power distribution grid. This power is then supplied to the local consumers
(C). Surplus energy is fed into the power distribution grid (E). Due to the power that is consumed by
the local devices, the amount of power required from the power distribution grid is reduced. An
energy surplus may even result in the energy meter (D) of your plant running backward. This power
may also be recorded as power credits by the electric utility company depending on the
interconnection agreement.
Principle of a PV Plant with a Sunny Boy
Anti-Islanding Protection
A stand-alone grid is a status. It occurs when the power distribution grid is switched off and the Sunny
Boy is in operation. For this to happen, the remaining load must be resonant at 60 Hz and exactly
match the power of the Sunny Boy. Although the appearance of these conditions is extremely unlikely,
the Sunny Boy has an active safety algorithm to protect against islanding. The effect of this is that, in
the event of the power distribution grid being switched off, the PV plant does not supply any power
to a symmetrical load that is resonant at 60 Hz. In addition, the Sunny Boy regularly feeds leading
and lagging reactive currents into the power distribution grid. This procedure is checked by the
certification body, in order to destabilize and switch off stand-alone grid status.
Item Description
A PV array
B Sunny Boy with SMA DC Disconnect
C Local consumers
D Energy meter
E Power distribution grid

SMA America, LLC Safety
Installation Guide SB50US-80US-eng-IUS112633 13
Ground Fault Detection and Interruption in the PV Array
The Sunny Boy is equipped with grounding fault detection. If a ground fault current larger than 1 A is
flowing, the Sunny Boy switches off and displays the disturbance. As soon as the ground fault has
been located and eliminated, the ground fault disturbance must be rectified manually. Following this,
the Sunny Boy resumes operation.
PV Series Fusing
Series fusing may be required depending on the type of PV module used in the plant. See
National Electrical Code® 690.9. For installation in Canada, the installation must be performed
according to the applicable Canadian standards.
Operating Temperature
The Sunny Boy delivers full performance in ambient temperatures up to +113 °F (+45 °C). Due to
the fan cooling, this level of performance can be achieved in closed rooms. The Sunny Boy does
remain operational above +113 °F (+45 °C), but it reduces the level of performance so as to protect
the internal component parts from overheating.
Interconnection Code Compliance
The Sunny Boy has been checked by the certification body and certified according to the guidelines
in UL 1741 Static Inverters and Charge Controllers for use in Photovoltaic Power Systems, IEEE 929-
2000 Recommended Practice for Utility Interface of Photovoltaic Systems, and IEEE 1547 Standard
for Interconnecting Distributed Resources with Electric Power Systems.
UL 1741 is the standard that is used for the Sunny Boy by the certification body, in
order to certify that it complies with the regulations in NEC and IEEE 929-2000.
IEEE 929-2000 states recommendations regarding the appropriate equipment and
functionality that is required to guarantee fault-free operation when the power
generation is connected to the power distribution grid.
The Sunny Boy is also certified according to C22.2 N0. 107.1-01 (General Use
Power Supplies).
FCC Compliance
The Sunny Boy has been tested and shown to conform with all FCC Part 15 A & B EMI/EMC
emissions regulations.
Prior to setting up and installing your PV plant, contact the on site grid operator or the
responsible authority.

Safety SMA America, LLC
14 SB50US-80US-eng-IUS112633 Installation Guide
2.2 Safety Instructions
DANGER
Danger to life due to high voltages in the inverter.
Risk of death or serious injury due to electric shock.
• Only qualified personnel may perform work on the inverter.
WARNING
During operation, the inverter can become hot.
Risk of burns.
• Do not touch the enclosure during operation.
• Only touch the lid during operation.

SMA America, LLC Safety
Installation Guide SB50US-80US-eng-IUS112633 15
2.3 Installation Overview
This section provides a brief overview of the installation process of a Sunny Boy.
Section 3: Unpacking and Inspection
This section provides instructions and information on unpacking the Sunny Boy and inspecting
shipping damage.
Section 4: AC Voltage Configuration
This section contains information on removing the cover, determining the position of the fundamental
component parts in the inverter and selecting the suitable voltage configuration for the installation.
Section 5: Mounting
This section provides guidelines to help you choose the best mounting location, recommendations for
achieving optimal performance, safety measures and warnings to prevent injuries and/or damage to
the device, and step-by-step instructions for mounting the Sunny Boy inverter.
Section 6: Wiring the Sunny Boy
This section contains guidelines for selecting the correct line cross-section, safety measures and
warnings to prevent injuries and/or damage to the device, and step-by-step instructions for connecting
the Sunny Boy to a PV array, to an electric circuit in the home, and to the power distribution grid.
Procedures are also included for connecting optional data communication cables.
Section 7: Commissioning
Commissioning comprises applying DC input power to the Sunny Boy, observing the LED and LCD
displays and resolving any problems that occur.
Section 8: Displays and Messages
This section provides information on messages that may appear during commissioning and operation.
Section 9: Troubleshooting
This section provides information for troubleshooting and procedures for resolving problems that may
occur during commissioning and operation.
Section 10: Maintenance
This section contains the maintenance and cleaning of the Sunny Boy and safety measures and
warning for preventing injuries and damage to the device.
Section 11: Technical Data
This section contains the technical data of the Sunny Boy, connection diagrams, and the correct
tightening torques for connecting the cables and screws to the Sunny Boy.

Unpacking and Inspection SMA America, LLC
16 SB50US-80US-eng-IUS112633 Installation Guide
3 Unpacking and Inspection
Inspect the packaging for damage prior to commencing installation. If the inverter is damaged,
immediately report the damage to your SMA dealer and the delivery company that delivered the
Sunny Boy.
If it is necessary to send the Sunny Boy back, use the original packaging.
If you require help with a damaged Sunny Boy, please contact your SMA dealer or SMA.
Contact information is provided in the "Contact" section, page 101.
WARNING
The Sunny Boy may fall over due to its heavy weight.
Risk of bruising and broken bones.
• When mounting the Sunny Boy, note that it has a weight of 148 lbs. (67 kg).
• Use suitable lifting techniques or get an additional person to assist.

SMA America, LLC Unpacking and Inspection
Installation Guide SB50US-80US-eng-IUS112633 17
3.1 Scope of Delivery
Item Quantity Description
A1Sunny Boy
B1Wall mounting bracket
C 1 Replacement screw and replacement tooth lock washers for connecting the
enclosure lid to the Sunny Boy.
2 Screws and washers for fastening the Sunny Boy to the wall mounting bracket
D 2 Spare jumpers for fan test
E 2 Handle covers (left and right)
F1SMA DC Disconnect
G 1 Screw and washer for connecting the enclosure lid to the DC Disconnect
2 Screws and washers for fastening the DC Disconnect to the wall mounting
bracket

AC Voltage Configuration SMA America, LLC
18 SB50US-80US-eng-IUS112633 Installation Guide
4 AC Voltage Configuration
4.1 Opening the Sunny Boy
1. Remove the six screws and conical spring washers from the enclosure cover. Pull the cover
forward smoothly.
2. Put the cover, screws and conical spring washers to one side so that they do not get in the way.
NOTICE
Damage to the enclosure lid may affect the seal between the enclosure lid and the
enclosure.
There may be an ingress of moisture.
Potential damage to the Sunny Boy.
• Handle the enclosure lid with care.
• Do not lose the screws and conical spring washers of the enclosure lid.
• When closing the enclosure, no moisture may remain in the enclosure.
• Do not install the Sunny Boy in the event of precipitation or a high level of humidity
(> 95 %).
NOTICE
The seal of the enclosure may become frozen shut due to frost.
Potential damage to the seal when opening the Sunny Boy.
There may be an ingress of moisture, damaging the Sunny Boy.
• Do not open the Sunny Boy when the outdoor temperature is below 23 °F ( − 5 °C).

SMA America, LLC AC Voltage Configuration
Installation Guide SB50US-80US-eng-IUS112633 19
4.2 Locating Internal Component Parts
Item Description
A Sockets for optional communication Piggy-Back (RS485 or wireless)
BDisplay
C Status LEDs
D Jumpers for configuring the AC voltage and the fan test
E Terminal blocks for configuring the AC voltage
F Ground terminal (PE)

AC Voltage Configuration SMA America, LLC
20 SB50US-80US-eng-IUS112633 Installation Guide
4.3 AC Voltage Configuration
The Sunny Boy is compatible with the following grid types:
• 208 V AC (not Sunny Boy 8000-US)
• 240 V AC
• 277 V AC
The Sunny Boy is configured ex works for connection to
the power distribution grid with a voltage of 240 V AC.
The Sunny Boy can be configured for other voltages.
4 cables are inserted into the enclosure via a cable
support sleeve. Each cable is labeled with its respective
voltage.
1. Connect the cable with the correct voltage to the
left terminal block (A).
2. To adjust the AC voltage, select the cable with the
correct voltage at the right terminal block (C).
Connect the selected cable to the left side of the left
terminal block (A).
3. Secure all screw terminals. If spring-type terminals
are available, close the levers of the terminals by
pressing down.
G Output AC conductor terminals (N, L1 and L2)
H Terminal block, PV grounding conductor + DC grounding conductor
I Output AC conductor terminals (L1, L2, N and PE)
J PV terminal GROUNDED (PV array input)
K PV terminal UNGROUNDED (PV array input)
L Combined terminal UNGROUNDED
MTerminal DC− (PV array input)
N Terminal DC+ (PV array input)
O Flat connection for grounding the cable shield for communication
P Terminal for optional communication (RS485)
The Sunny Boy 8000-US must not be connected to a 208 V grid.
Item Description

SMA America, LLC AC Voltage Configuration
Installation Guide SB50US-80US-eng-IUS112633 21
Tightening torque of the screw terminals for the left terminal block:
4. Connect and fasten all cables not being used to the right terminal block (C). Tightening torques
of the screw terminals for the right terminal block (cables not being used):
Automatic Grid Voltage Detection
The Sunny Boy automatically detects the grid voltage that it must feed in. Depending on the voltage
and the phase angle between L1‑N and L2‑N, the inverter determines whether it is connected to a
208 V, 240 V or 277 V grid. If the Sunny Boy is configured for the wrong grid voltage (for example,
the inverter was configured for 240 V and then connected to a 208 V grid), the Sunny Boy displays
an error message.
The table below contains the limiting values for voltage and frequency in the AC terminal:
If the power distribution grid uses a neutral conductor, the responsible authority can demand that a
neutral conductor be connected to the inverter.
To set the configuration jumpers, observe the procedure in 4.4 ”Jumper for System Configuration”
(page 23).
To connect a neutral conductor to the Sunny Boy, observe section 6.4.2 ”AC Connection without
SMA DC Disconnect” (page 41) or section "AC Wiring with SMA DC Disconnect" on page 43.
Configuration of Grid Voltage
The figure on the next page illustrates common grid forms. Note that it is not the phase relationship
that is important when connecting the Sunny Boy to the power distribution grid, but the voltage
compatibility.
Gray terminal blocks (Weidmüller) 18 in-lbs. (2 Nm)
Green terminal blocks (Phoenix) 22 in-lbs. (2.5 Nm)
Do not remove the cable in the left terminal block with the marking 0 V (B).
This always remains connected to the right side of the left terminal block.
Gray terminal blocks (Weidmüller) 11 in-lbs. (1.2 Nm)
Green terminal blocks (Phoenix) 15 in-lbs. (1.7 Nm)
If the Sunny Boy is configured for the wrong
input voltage, this error message appears in
the display:
• Check if the configuration of the AC voltage is correct.
Voltage range for 208 V nominal value, phase-phase
(not Sunny Boy 8000-US)
183 V … 229 V
Voltage range for 240 V nominal value, phase-phase 211 V … 264 V
Voltage range for 277 V nominal value, phase-neutral conductor 244 V … 305 V
Frequency range 59.3 Hz … 60.5 Hz

AC Voltage Configuration SMA America, LLC
22 SB50US-80US-eng-IUS112633 Installation Guide
*The Sunny Boy 8000-US must not be connected to a 208 V grid.
When using corner grounded 240 V or 208 V Delta grids:
• Connect terminal L2 to the grounded phase.
*
*
*