SMA SB 700U User Manual
Sunny Boy SB 700U
Installation Guide Version 1.1 SB700U-11:SE3207
TBE-SB07U
ii SMA America SB700U-11:SE3207
Copyright © 2007 SMA America, Inc. 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, Inc.
SMA America makes no 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 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 reserves 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.
Revision History
Rev.
No.
0.1 Sept. 2, 2003 Mike Brazil Alpha draft
0.2 Oct. 16, 2003 Mike Brazil Beta draft
0.3 Nov. 12, 2003 Jeffrey Philpott Preliminary Release
1.0 March 22, 2004 Gerald Salisbury First official version
1.1 March 2, 2007 Diana Welzel Adjustment for new Certification
Date By Reason
SMA America, Incorporated
12438-C Loma Rica Drive
Grass Valley, California 95945
Tel 530.273.4895
Fax 530.274.7271
www.sma-america.com
SB700U-11:SE3207 SMA America iii
IMPORTANT SAFETY INSTRUCTIONS
SAVE THESE INSTRUCTIONS
This manual contains important instructions for the Sunny Boy 700U that must be
followed during installation and maintenance of the inverter.
The Sunny Boy 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 Sunny Boy. To reduce the
risk of personal injury and to ensure the safe installation and operation of the Sunny
Boy, you must carefully read and follow all instructions, cautions, and warnings in
this Installation Guide.
Safety and Hazard Symbols
This symbol is used to call attention to important information that you
must have when installing and/or operating the Sunny Boy. Failure
to read and follow instructions marked with this symbol could result
in injury or death and/or damage to the equipment.
This symbol appears beside instructions and warnings that deal with
dangerous voltages that can injure or kill people who come in
contact with them.
This symbol appears beside instructions, cautions, and warnings that
deal with portions of the equipment that can operate at temperatures
high enough to cause burns.
iv SMA America SB700U-11:SE3207
Cautions and Warnings
WARNING:A Warning describes a hazard to 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.
CAUTION:A Caution describes a hazard to equipment. It
calls attention to an operating 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.
Warnings and Cautions may also be accompanied by one or more of the safety
and hazard symbols described above to indicate the type of hazard described
therein.
Other Symbols
In addition to the safety and hazard symbols described on the previous pages, the
following two symbols are also used in this Installation Guide:
This symbol accompanies notes that call attention to supplementary
information that you should know and use to ensure optimal
operation of the system.
This symbol appears beside terminations that are connected to earthground.
SB700U-11:SE3207 SMA America v
General Warnings
All electrical installations must be done in accordance with the
local and National Electrical Code ANSI/NFPA 70.
The Sunny Boy contains no user-serviceable parts. Always return
the unit to an authorized SMA Service Center for repairs and
maintenance.
Before installing or using the Sunny Boy, read all of the
instructions, cautions, and warnings on the Sunny Boy, the PV
array, and in this Installation Guide.
You must not connect the Sunny Boy to the electrical utility grid
until you have received prior approval from the utility company.
This connection must be made only by qualified personnel.
PV arrays produce electrical energy when exposed to light and
thus can create an electrical shock hazard. Completely cover the
surface of all PV-arrays with opaque (dark) material before wiring
them.
The Sunny Boy has a heat sink on its top surface to help cool the
internal components. This heat sink can reach temperatures as
high as 158° F (70° C). To avoid the risk of burns, never touch
the Sunny Boy’s heat sink while the unit is in operation.
Warranty
All Sunny Boy SB 700U inverters sold in the USA have a five-year warranty, as
indicated on the warranty card included in the Sunny Boy shipping container. For
warranty coverage, or if you have questions about the Sunny Boy warranty, contact
SMA America at the address, telephone number, or Web site listed on
send E-mail, see the Contact section of the SMA America Web site).
vi SMA America SB700U-11:SE3207
page iii (to
Contents
Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .iii
Safety and Hazard Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . .iv
Cautions and Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
Other Symbols. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
General Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .vi
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .vi
1 Introduction
Product Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Installation Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
2 Unpacking and Inspection
3 Mounting the Sunny Boy
Choosing a Mounting Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Dimensions and Recommended Clearances . . . . . . . . . . . . . . . . . . . 3-4
Mounting Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
4 Wiring and Connecting the Sunny Boy
Sequence of Connecting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Sunny Boy 700U Internal Components . . . . . . . . . . . . . . . . . . . . . . . 4-3
Opening the Sunny Boy 700U . . . . . . . . . . . . . . . . . . . . . . 4-3
Locating Internal Components . . . . . . . . . . . . . . . . . . . . . . . 4-3
Wiring the AC Output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
AC Connection Requirements . . . . . . . . . . . . . . . . . . . . . . . 4-6
Connecting the AC Wires . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8
Wiring the DC Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
DC Connection Requirements . . . . . . . . . . . . . . . . . . . . . . 4-10
Configuring the DC Input-Voltage Range . . . . . . . . . . . . . . 4-11
Connecting the DC Wires . . . . . . . . . . . . . . . . . . . . . . . . . 4-15
Connecting Communication Cables . . . . . . . . . . . . . . . . . . . . . . . . 4-18
RS-485 Communication . . . . . . . . . . . . . . . . . . . . . . . . . . 4-18
Replacing the Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-20
5 Commissioning
SB700U-11:SE3207 SMA America vii
6 Displays and Messages
LED Operation Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
LED Fault Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6
Status Messages on the Display . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-11
Sunny Display Language Selection . . . . . . . . . . . . . . . . . . 6-15
Communication Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-16
Measuring Channels and Messages . . . . . . . . . . . . . . . . . . . . . . . . 6-18
Measuring Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-18
Operating Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-19
Sunny Boy 700U Operating Parameters . . . . . . . . . . . . . . 6-20
7 Troubleshooting
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
Error messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3
8 Technical Specifications
FCC Compliance Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
Sunny Boy Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3
Trip Limits / Trip Times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-5
Torque Values and Wire Sizes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-5
viii SMA AmericaSB700U-11:SE3207
Section 1:
Introduction
This installation guide provides all the information needed to mount, wire, and
commission a Sunny Boy 700U grid-tied photovoltaic (PV) inverter.
Note:To help avoid problems during the installation, familiarize yourself with the installation process by reading
the entire Installation Guide before starting the installation.
WARNING:Lethal voltages are present at various
points in a PV system. For safety reasons, it is recommended that only trained professionals attempt
to install this equipment.
SB700U-11:SE3207 SMA America 1-1
Product Overview
The Sunny Boy is a DC to AC grid-tied utility interactive inverter for use with
photovoltaic (PV). The SB 700U is additionally UL listed for the use with fuel cell,
wind turbine and other sources of DC power.
In general, the Sunny Boy takes power from a DC source (PV modules) and converts
it to AC power for the utility grid. This power is delivered first to local loads
(household appliances, lights, motor loads, etc.), with any excess power fed to the
utility. The power consumed by the local loads reduces the power needed from the
utility. Excess power may actually “spin the utility meter backwards” depending on
the type of meter in your system. This power may also be recorded as power credits
by the utility company depending on the interconnection agreement. An example of
basic system components is shown in
Figure 1-1 (page 1-2).
Meter
PV Array
Sunny Boy 700U
Utility Grid
Figure 1-1 Sunny Boy 700U Installed in a Utility Interactive PV System
Note:Policies vary from one utility company to another. Consult with a representative of the local utility company before
planning and installing a PV system.
1-2 SMA America SB700U-11:SE3207
Safety
Anti-Islanding Protection
Islanding is a condition that can occur if the utility grid is disconnected while the
Sunny Boy is operating and the remaining load is resonant at 60 Hz and matches
the output of the Sunny Boy perfectly. This condition is highly unlikely and had never
been witnessed outside of a controlled laboratory. Nevertheless, the Sunny Boy
incorporates an advanced active islanding protection algorithm to insure that the
system will not export power into a balanced 60 Hz resonant load while the utility
is disconnected. The Sunny Boy periodically injects both leading and lagging
reactive current into the utility grid. This method has been proven by U.S. regulatory
agencies to effectively destabilize and disconnect from a balanced island condition.
PV Ground Fault Detection and Interruption
The Sunny Boy is equipped with a ground fault detection device. If a ground fault
current greater than 1 Amp is detected, the Sunny Boy will shut down and display
the fault condition on the user interface display. Once the ground fault is located
and corrected, the ground fault error will need to be manually cleared and the
inverter will then resume normal operation.
PV Series Fusing
Series fusing may be required depending on the type of PV module used in the
system. See NEC 690.9
Interconnection Code Compliance
The Sunny Boy has been tested and certified by UL to meet the requirements of
UL1741 Static Inverters and Charge Controllers for use in Photovoltaic Power
Systems as well as IEEE-929-2000 Recommended Practice for Utility Interface of
Photovoltaic Systems and IEEE 1547 Standard for Interconnecting Distributed
Resources with Electric Power Systems. The Sunny Boy is also UL listed under
UL1741 for use in Canada.
SB700U-11:SE3207 SMA America 1-3
UL1741 is the standard applied by Underwriters Laboratories
to the Sunny Boy to certify that it meets the requirements of the
NEC 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.
Note: Contact the local utility and/or the authority having
jurisdiction prior to connecting the Sunny Boy to the utility
grid.
FCC Compliance
The Sunny Boy has been tested and certified by a nationally recognized testing
laboratory and conforms to all FCC Part 15 B EMI/EMC emissions regulations.
Feature Overview
Over twenty years of inverter manufacturing experience has gone into the design of
the Sunny Boy. As a result, the Sunny Boy represents state-of-the-art technology, high
reliability and overall ease of use - all the qualities you’ve come to expect from
SMA, the industry leader in inverter technology. Some of the features included are:
•LCD
• Advanced communication options
• Compatible with all SMA inverter and communication products
• Simple installation
• Rugged stainless steel enclosure
1-4 SMA America SB700U-11:SE3207
Installation Overview
This section provides a high-level overview of the installation process so you have
an idea what to expect as you proceed through the rest of the Installation Guide.
The installation process is broken down into the following tasks:
Section 2: Unpacking and Inspection
This section provides instructions and information for unpacking the Sunny Boy,
inspecting it for shipping damage, and if necessary, returning a damaged Sunny
Boy.
Section 3: Mounting the Sunny Boy
This section includes guidelines to help you select the best mounting location,
cautions and warnings that you should follow to avoid injury and/or equipment
damage, and step-by-step instructions for mounting a Sunny Boy 700U inverter.
Section 4: Wiring and Connecting the Sunny Boy
This section includes guidelines for selecting the correct wire sizes, cautions and
warnings that you should follow to avoid injury and/or equipment damage, and
step-by-step instructions for setting the internal voltage-range jumper, wiring a Sunny
Boy to a PV array, household electrical circuits, and the utility grid. Procedures are
also included for connecting optional data-communication cables to the Sunny Boy.
Section 5: Commissioning
Commissioning involves applying DC input power to the Sunny Boy, observing the
LED indicators on the cover, and resolving any problems that occur.
Section 6: Displays and Messages
This section provides tips and procedures for resolving problems that can occur
during installation.
SB700U-11:SE3207 SMA America 1-5
1-6 SMA America SB700U-11:SE3207
Section 2:
Unpacking and Inspection
All Sunny Boy inverters are thoroughly checked before they are packed and
shipped. Although they are shipped in sturdy, recyclable packaging, damage can
still occur during shipping and delivery. It is important for you to carefully inspect
the shipping container prior to beginning the installation. If you detect any external
damage to the packaging that makes you suspect the inverter itself could be
damaged, or if you find that the inverter is damaged after unpacking it, report the
damage immediately to your SMA dealer and to the shipping company that
delivered the Sunny Boy. If it becomes necessary to return the Sunny Boy, use the
original packaging in which the Sunny Boy was delivered.
WARNING:The Sunny Boy 700U weighs 16 kg (36 lb.).
To avoid injury, lift the Sunny Boy carefully, and be
careful to prevent the weight of the inverter from causing you to lose your balance and fall. If possible, have
someone help you when you unpack the Sunny Boy.
If you need assistance in dealing with a damaged Sunny Boy, contact your SMA
dealer or SMA America. Contact information for SMA America is provided below.
SMA America, Incorporated
12438-C Loma Rica Drive
Grass Valley, California 95945
Tel 530.273.4895
Fax 530.274.7271
www.sma-america.com
SB700U-11:SE3207 SMA America 2-1
2-2 SMA AmericaSB700U-11:SE3207
Section 3:
Mounting the Sunny Boy
This section provides guidelines to help you select the best mounting location,
cautions and warnings that you should follow to avoid injury and/or equipment
damage, and step-by-step instructions for mounting a Sunny Boy 700U inverter.
WARNING:To avoid injury, lift the Sunny Boy carefully, and handle it carefully to prevent the weight of the
inverter from causing you to lose your balance and
fall. If possible, have someone help you when you
mount the Sunny Boy.
Note:Occasionally, the rating label on the Sunny Boy will
need to be referred to. For this reason, it is required that the
inverter be mounted so that the rating label on the side of the
inverter be visible.
SB700U-11:SE3207 SMA America 3-1
Choosing a Mounting Location
Consider the following guidelines, cautions, and warnings when choosing a
mounting location for a Sunny Boy inverter:
• The Sunny Boy 700U should be installed in a location where it is not exposed to direct
sunlight, since the higher temperature within the unit caused by the sun can result in reduced output from the PV system. When the heatsink on the top of the Sunny Boy is exposed to direct sunlight, the inverter operates in Derate Mode, which reduces the output
power of the system to keep the heatsink temperature below 158° F (70° C).
• The inverter must be installed in a location that is inaccessible to children.
• The Sunny Boy emits a slight vibrating noise when operating. This vibration is normal and
has no effect on performance, but it can be objectionable if the inverter is mounted on a
wall in a living area, on the outside of a wall that is part of a living area, or on certain
types of materials, such as thin wood panelling or sheet metal.
• If the inverter is installed outside, it must be mounted vertically or with the top tilted towards the back. To ensure optimum energy yield and ease of operation, mount the inverter vertically and at eye level (see Figure 3-1).
Vertical
(Best)
Tilted Back
(Acceptable)
Tilted Forward
(Unacceptable)
Figure 3-1 Sunny Boy Mounting Positions
CAUTION:The Sunny Boy 700U weighs 16 kg (36 lb.).
Ensure that the surface on which you mount the Sunny Boy
is strong enough to hold the weight. Do not mount the
Sunny Boy on plasterboard (sheet-rock) or thin wood
panelling.
CAUTION:All electrical conduits and any communication
cables must be positioned and/or sealed so that no water
can enter the inverter enclosure through these conduits
and cables.
3-2 SMA America SB700U-11:SE3207
CAUTION: Rain-tight or wet location hubs that comply
with the requirements in the Standard for Fittings for Cable and Conduit , UL 514 B, are to be used.
CAUTION:If the Sunny Boy is mounted outside, humid
weather during the installation could cause eventual
damage to the inverter. If moisture from damp air is
enclosed in the case when you complete the installation,
it will eventually condense within the case, and the
moisture can damage the electronic components. Do not
install the Sunny Boy when it is raining, and if possible,
choose a day when the humidity is low to install it.
CAUTION:If you are installing the Sunny Boy in a cabinet, closet, or other relatively small enclosed area, you
must provide sufficient air circulation to dissipate the heat
generated by the inverter.
WARNING:When the Sunny Boy is operating,
individual parts of the enclosure may reach
temperatures of 158° F (70° C). To prevent fires,
ensure that nothing comes in contact with the heat
sink and that surrounding materials are sufficiently
heat-resistant.
WARNING:To prevent electrical shock or other injury, check for existing electrical or plumbing installations in the walls where you plan to drill mounting
holes for the Sunny Boy prior to drilling.
SB700U-11:SE3207 SMA America 3-3
Dimensions and Recommended
Clearances
The outer dimensions of the Sunny Boy 700U are shown in Figure 3-2. The Sunny
Boy must be mounted so that there is at least eight inches of clearance above the
heat sink that is mounted on the top of the inverter
180 mm
(7.09 in)
320 mm
(12.60 in)
322 mm
(12.68 in)
Figure 3-2 Outer Dimensions of the Sunny Boy 700U
CAUTION: You must ensure that there is sufficient clearance
for heat dissipation above the Sunny Boy’s heat sink! In a normal operating environment with good ventilation, eight inches of clearance is adequate. However, if the airflow to the
Sunny Boy is restric ted or it is subj ected t o other a bnorma l operating conditions, enough additional clearance (or forced
ventilation) must be provided to allow the heat that the Sunny
Boy produces to dissipate freely.
Note: If additional ventilation is required use the optional
Sunny Breeze fan that mounts to the heat sink.
Note: The National Electrical Code may require significantly
larger working clearances (see NEC Section 110.26).
3-4 SMA America SB700U-11:SE3207
Wall-Mounting Bracket
Figure 3-3 Dimensions of the wall-mounting bracket
SB700U-11:SE3207 SMA America 3-5
Mounting Procedure
The Sunny Boy 700U is shipped with a T-shaped wall-mounting bracket that is
suitable for use with most walls (see
has two holes spaced for 16-inch centers for mounting on wooden wall studs, or it
can be mounted on concrete or stone walls. Make sure that the wall you choose to
mount the Sunny Boy on is sturdy enough to support its weight (16 kg/36 lb.) over
a long period of time and that the wall is plumb.
Figure 3-4). The horizontal part of the T bracket
2
1
3
Figure 3-4 Sunny Boy 700U with Mounting Bracket
Use the following procedure to mount the Sunny Boy:
1. Locate the T-shaped wall-mounting bracket included in the shipping container
with the Sunny Boy.
2. Position the wall-mounting bracket against the wall where you intend to mount
the Sunny Boy (it is best to mount the Sunny Boy at approximately eye-level),
place a level on the top edge of the bracket, and adjust the position of the
bracket so that it is level.
3. Using the wall-mounting bracket as a template, mark the wall through the two
holes in the horizontal portion of the bracket.
CAUTION:Ensure that there are studs in the wall at the
places where you intend to drill the mounting-holes. DO NOT
use molly or toggle bolts to mount the Sunny Boy to sheet
rock or panelling.
4. Set the bracket aside temporarily, and drill holes at the marks you made on the
3-6 SMA America SB700U-11:SE3207
wall.
Note: The diameter of the holes you drill must match the
hardware you are using to mount the Sunny Boy. For
example, if you are mounting the Sunny Boy on a concrete
wall, the hole diameter should be approximately the same as
the outside diameter of the concrete anchors you intend to
use. If you are mounting the Sunny Boy on a wall that has
wooden studs inside it, the hole diameter should be the
correct size for the lag screws you intend to use to mount the
bracket. If you are installing the Sunny Boy outside, the lag
screws must be made of stainless steel, and the diameter of
the screws should closely match the diameter of the holes in
the wall-mounting bracket. If you use M6x10 or 1/4”
screws, drill
7/32-inch pilot holes.
5. Insert two stainless-steel lag screws through the holes in the horizontal part of
the wall-mounting bracket and into the holes you drilled in the wall. Tighten the
screws until the bracket is held firmly against the wall (see #1 in Figure 3-4).
Do not overtighten the screws.
6. Carefully lift the Sunny Boy into position near the mounting bracket. The
upside-down, U-shaped bracket attached to back of the Sunny Boy at the top
edge fits over the top edge of the bracket so that the Sunny Boy hangs from the
bracket (see #2 in Figure 3-4).
WARNING:To avoid injury, lift the Sunny Boy carefully, and handle it carefully to prevent the weight of the
inverter from causing you to lose your balance and
fall. If possible, have someone help you when you
mount the Sunny Boy.
7. Inspect the Sunny Boy from both sides to ensure that the U-shaped bracket on
the Sunny Boy fully engages the top edge of the mounting bracket and that the
Sunny Boy is centered on the bracket.
8. Locate the mounting strap that hangs from the back of the Sunny Boy at the
bottom.
9. Insert an M6x10 bolt through the hole in the mounting strap and into the
threaded hole in the bottom end of the wall-mounting bracket (see #3 in Figure
3-4).
10. Tighten the bolt fully (do not overtighten).
SB700U-11:SE3207 SMA America 3-7
11. Verify that the Sunny Boy 700U is firmly mounted in place.
3-8 SMA America SB700U-11:SE3207
Section 4:
Wiring and Connecting the Sunny
Boy
This section provides step-by-step procedures and other information required for
wiring the Sunny Boy 700U to the PV array, the household circuits, and the utility
grid. To accomplish the installation in the safest and most efficient manner, complete
the steps in the order that they appear.
WARNING: Before connecting or operating the
Sunny Boy, read all of the instructions, cautions,
and warnings on the Sunny Boy, the PV array, and
in this Installation Guide.
WARNING: You must connect the wires that carry
the AC voltage from the Sunny Boy to the utility grid
and the wires that carry the DC voltage from the PC
array to the Sunny Boy in the order described in the
procedures in this section. Deviating from these procedures could expose you to lethal voltage that can
cause serious injury.
WARNING: Always turn OFF all breakers and
switches in the PV system before connecting any
wires to the Sunny Boy or disconnecting any wires
from the Sunny Boy.
For inverters provided with a fixed AC output:
Note: The AC input and AC output circuits are isolated from the
enclosure and system grounding, if required by section 250 of the
National Electric Code, ANSI/NFPA 70, is the responsibility of the
installer.
Note: The Photovoltaic 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.
SB700U-11:SE3207 SMA America 4-1
Sequence of Connecting
WARNING: Always connect the wires to the Sunny
Boy in the following sequence:
1. De-energize all AC and DC sources by switching all AC and DC disconnects
and/or breakers OFF.
2. Wiring from AC breaker to the AC disconnect switch.
3. Wiring from the AC disconnect switch to the Sunny Boy, follow the procedure
on page 4-6 et seq..
4. Wiring from the PV wires to the DC disconnect.
5. Wiring from the DC disconnect to the Sunny Boy, follow the procedure on
page 4-10 et seq..
6. Turn the DC switches and/or breakers ON.
7. Turn the AC switches and/or breakers ON.
To disconnect the Sunny Boy first turn OFF all AC disconnects and then all DC
disconnects. The AC system should always be disconnected before the DC system.
After the Sunny Boy is de-energized, disconnect the wiring in the reverse order from
above.
WARNING: Always wait a minimum of 5 minutes
for the stored potential in the Sunny Boy to discharge completely before opening the enclosure.
WARNING: All electrical installations must be done
in accordance with all local electrical codes and the
National Electrical Code (NEC), ANSI/NFPA 70.
WARNING: Before connecting the Sunny Boy to the
electrical utility grid, contact the local utility company. This connection must be made only by qualified
personnel.
4-2 SMA America SB700U-11:SE3207
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