Power One AURORA MICRO-0.25-I-OUTD-US-208/240 User manual

THE MANUAL: MICRO
Model Number: MICRO-0.25-I-OUTD-US-208/240
MICRO-0.3-I-OUTD-US-208/240

AURORA MICRO ®
Grid Tied Inverters
MICRO-0.25/0.3-I-OUTD-US-208/240
Technical Manual

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Copyright © 2013 Power-One Renewable Energy Solutions LLC. All rights reserved. No part of this
document may be reproduced in any form or by any means without the prior written permission of
Power-One Renewable Energy Solutions LLC. Power-One Renewable Energy Solutions LLC makes
no representations, express or implied, with respect to this document or any of the equipment
and/or software it may describe; including (without limitation) any implied warranties of utility, or
merchantability for any particular purpose. All such warranties are expressly disclaimed. Power-
One Renewable Energy Solutions, LLC, its subsidiaries, affiliates, distributors and dealers shall not
be liable for any indirect, special, incidental, or consequential damages under any circumstances.
Power-One Renewable Energy Solutions LLC reserves the right to make changes to this document
without notice and shall not be responsible for any damages, including indirect, special, incidental
or consequential damages, caused by reliance on the content presented, including, but not limited
to, any omissions, typographical errors, arithmetical errors or listing errors. All trademarks, logos,
trade names, service marks and copyrighted materials used in this document are the property of
their respective owners. Failure to designate a mark as registered does not mean that such mark is
not a registered trademark. The Power-One name and logo are registered trademarks of Power-
One, Inc. in the U.S.A. and other countries. All rights reserved. No licenses are conveyed herein,
implicitly or otherwise, under any intellectual property rights.
Power-One
Renewable Energy Solutions LLC
740 Calle Plano
Camarillo, California, 93012
United States of America

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Table of Revisions
Revision
Number
Author
Date
Approved by
Description of
Modification
AA
Tech docs
12/6/12
BCG.00612,
BCM.00138
New release
AB
Tech docs
2/4/13
BCG.00612,
BCM.00138
New data sheet,
new label,
modify overcurrent
table 3-1

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Contents
PART 1 INTRODUCTION AND SAFETY .......................................................................................................................5
1.1 INTRODUCTION................................................................................................................................................................................ 6
1.2 SAFETY............................................................................................................................................................................................10
1.3 SYSTEM INTEGRATION .................................................................................................................................................................20
PART 2 UNPACK AND SELECT INSTALLATION LOCATION ..............................................................................21
2.1 GENERAL CONDITIONS .................................................................................................................................................................22
2.2 SELECT INSTALLATION LOCATION .............................................................................................................................................24
2.3 CHOICE OF AC CABLE...................................................................................................................................................................28
PART 3 MOUNTING AND WIRING .............................................................................................................................30
3.1 ASSEMBLY DIAGRAM ....................................................................................................................................................................31
3.2 ASSEMBLY INSTRUCTIONS ...........................................................................................................................................................32
3.3 WIRING DETAILS...........................................................................................................................................................................40
3.4 CONNECTION TO THE AC DISTRIBUTION GRID (AC SIDE)......................................................................................................42
3.5 WIRING OF AC CABLE ..................................................................................................................................................................43
PART 4 OPERATIONS GUIDE ......................................................................................................................................44
4.1 GENERAL CONDITIONS .................................................................................................................................................................45
4.2 DISPLAY AND KEYPAD..................................................................................................................................................................45
4.3 COMMISSIONING............................................................................................................................................................................48
PART 5 TROUBLESHOOTING......................................................................................................................................50
5.1 ALARM MESSAGES GENERATED BY THE MICRO INVERTER..................................................................................................51
5.2 VERIFICATION OF GROUND LEAKAGE........................................................................................................................................55
5.3 MEASURING THE INSULATION RESISTANCE OF PHOTOVOLTAIC MODULE..........................................................................56
5.4 THE POWER-0NE SERVICE CALL................................................................................................................................................58
PART 6 MAINTENANCE GUIDE...................................................................................................................................59
6.1 GENERAL CONDITIONS.................................................................................................................................................................60
6.2 STORAGE AND DISMANTLING......................................................................................................................................................62
PART 7 APPENDIX..........................................................................................................................................................63
7.1 TECHNICAL DATA ..........................................................................................................................................................................64
7.2 TEMPLATE FOR MAP OF MICROINVERTER INSTALLATION .................................................................................................75
7.3 INDEX OF TABLES AND FIGURES.................................................................................................................................................76

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Technical Manual
PART 1 INTRODUCTION AND SAFETY

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Part 1 Introduction and Safety
1.1 INTRODUCTION
This manual contains important instructions for models indicated on the front cover that shall be
followed during installation and maintenance of the inverter.
THE INSTALLER MUST READ THIS DOCUMENT IN ITS ENTIRETY BEFORE INSTALLING OR
COMMISSIONING THIS EQUIPMENT.
1.1.1 PURPOSE
The purpose of this document is to support the qualified technician, who has received training
and/or has demonstrated skills and knowledge in construction to install and maintain this Power-
One AURORA MICRO ® grid tied inverter. This manual does not cover any details concerning
equipment connected to the inverter such as the solar modules. Information concerning the
connected equipment is available from the respective manufacturer.
This manual is a guide that will enable installers to work safely, install the MICRO system and
maintain it in good working order.
1.1.2 INSTALLATION
The installation is to be done by a qualified installer, normally a licensed electrician or contractor,
according to the applicable local code regulations (National Electric Code (NEC), Canadian Electric
Code (CEC), and other).
For safety reasons only a qualified electrician, who has received training and/or has demonstrated
skills and knowledge in construction and in operation of this unit, can install this inverter.
1.1.3 VALIDITY AND AVAILABLE MODELS
There are two models of the MICRO, delineated by the maximum output power (0.25 kW or 0.3
kW). Each version is also available for either a 240Vac split phase or 208Vac single phase AC grid
connection.
This document applies only to the inverter models listed in Table 1-1. All model dimensions are
15.0” x 9.7” x 1.37” and weigh 3-1/2 lb (1.65kg).

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Part 1 Introduction and Safety
Table 1-1: Inverter models available
Output power
Model number
250 Watts
MICRO-0.25-I-OUTD-US-208/240
300 Watts
MICRO-0.3-I-OUTD-US-208/240
1.1.4 NAMEPLATE
The nameplate shown below is affixed to the inverter and provides the following information:
Table 1-2: Product nameplate
Certification
Model name
DC Rating

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Part 1 Introduction and Safety
AC Rating
Environmental
rating
Serial number
MAC address
1.1.5 COMMISSIONING
Power-One can provide commissioning (initial setup and power up). Please contact Power-One
Customer Service at 1-877-261-1374.

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Part 1 Introduction and Safety
1.1.6 MAINTENANCE AND SERVICE
The MICRO inverter has no user-serviceable parts. Maintenance and service procedures must
comply with the manufacturer's documentation. For more detailed information see Maintenance,
Part 6, in this document.
1.1.7 FIGURES AND IMAGES IN THIS MANUAL
The photos in this manual may differ slightly from the final model shipped and the color of the
components may not match those illustrated; however, the information is still applicable.
1.1.8 STORAGE OF THIS INFORMATION
Keep this document in a safe place near the AURORA MICRO inverter for easy access during
installation and maintenance. It must be accessible for approved service and maintenance
personnel at any time.
1.1.9 ADDITIONAL INFORMATION
More information on Power-One’s AURORA MICRO inverter can be found at www.power-one.com.
1.1.10 CONDITIONS OF WARRANTY
Warranty Conditions can be found on the Power-One Renewable Energy website located in the
download section of the AURORA MICRO inverter product page.

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Part 1 Introduction and Safety
IMPORTANT SAFETY INSTRUCTIONS!
SAVE THESE INSTRUCTIONS – KEEP IN A SAFE PLACE!
1.2 SAFETY
1.2.1 WARNINGS IN THIS DOCUMENT
This is a list of special safety symbols used in this manual that highlights potential safety risks
and/or useful information. The symbol usage is described below:
Symbol
Usage
DANGER:
Indicates a hazardous situation that can result in deadly electric shock hazards,
other serious physical injury, and/or fire hazards.
WARNING:
Indicates directions which must be fully understood and followed in entirety in
order to avoid potential safety hazards including equipment damage or personal
injury.
CAUTION:
This points out that the examined area must not be entered or that the described
operation must not be carried out. The reader should stop, use caution and fully
understand the operations explained before proceeding.
WARNING
DANGEROUS VOLTAGE
The product works with high voltages. All work on the AURORA Inverter must
follow the described documentation and must comply with all prevailing codes and
regulations associated with high voltages. During inverter operation, parts will be
energized at voltage levels.
WARNING
HOT TEMPERATURE
Some surfaces may become hot. Do not touch the product while it is in operation.
UL 1741 Standard for Safety for Inverters, Converters, Controllers and
Interconnection System Equipment for use with Distributed Energy Resources.
CSA CSA-C22.2 No. 107.1-01 - General Use Power Supplies.

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Part 1 Introduction and Safety
1.2.1.1 Equipment Safety Warnings
In addition to the safety and hazard symbols, the following symbols are also used in this installation
guide:
System earth conductor (main grounding protective earth,
PE)
Alternating Current (AC) Value
Direct Current (DC) Value
ø
Phase
Grounding (earth)
The equipment has various labels. Those with a yellow background refer to safety concerns. Be sure
to read all labels before beginning installation of the equipment. If any questions arise as to the
meaning or intent of these notices, please contact Power-One Technical Support at 877-261-1374.
1.2.1.2 General Installation Warnings
The AURORA MICRO inverter is designed and tested according to international safety requirements
(Ul 1741/IEEE 1547); however, certain safety precautions must be observed when installing and
operating this inverter. The installer must read and follow all instructions, cautions and warnings
in this installation manual.
The UL1741 requires the following voltage and frequency limits for utility interaction listed in the
table below:

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Part 1 Introduction and Safety
Table 1-3: Voltage and frequency trip limits
Condition
Simulated utility source
Maximum time (sec) at 60
Hz before cessation of
current to the simulated
utility
Voltage (V)
Frequency (Hz)
A
V< 50% Vnor
(Not Adjustable)
Rated
0.16 sec
(Not Adjustable)
B
50%Vnor≤ V< 88% Vnor
(Adjustable Set Points 55% to
88%)
Rated
2 sec (Default)
(Adj. Set Points 0.16 sec
to 5 sec)
C
110%Vnor≤ V< 120% Vnor
(Adjustable Set Points 110% to
118%)
Rated
1 sec (Default)
(Adj. Set Points 0.16 sec
to 5 sec)
D
V≥120% Vnor
(Not Adjustable)
Rated
0.16 sec
(Not Adjustable)
E
Rated
f > 60.5
(Not Adjustable)
0.16 sec
(Not Adjustable)
F
Rated
f < 59.3 (Default)
(Adj. Set Points 59.8
Hz to 57.2 Hz)
0.16 sec (Default)
(Adj. Set Points 0.16 sec
to 300 sec)
G
Rated
f < 57.0
(Not Adjustable)
0.16 sec
(Not Adjustable)
WARNING:
All operations regarding transport, installation and start-up, including
maintenance, must be carried out by qualified, trained personnel and in
compliance with all prevailing local codes and regulations.
Basic safety rules require using qualified and trained personnel possessing the
skills necessary for assembly, mounting, start up and operation of the product.

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Part 1 Introduction and Safety
1.2.1.3 Assembly Warnings
Prior to installation, inspect the unit to ensure absence of any transport or handling damage, which
could affect insulation integrity or safety clearances; failure to do so could result in safety hazards.
Assemble the inverter per the instructions in this manual. Use care when choosing installation
location and adhere to specified cooling requirements.
Unauthorized removal of necessary protections, improper use, incorrect installation and operation
may lead to serious safety and shock hazards and/or equipment damage.
1.2.1.4 Electrical Connection Warnings
This grid-tied inverter system operates only when properly connected to the AC -distribution
network. Before connecting the AURORA MICRO to the power distribution grid, contact the local
power distribution grid company to get appropriate approvals. This connection must be made only
by qualified technical personnel
CAUTION:
Systems with inverters typically require additional control (e.g., switches,
disconnects) or protective devices (e.g., fusing circuit breakers) depending
upon the local safety regulations.
It is the responsibility of the installer to provide external disconnect
switches and Overcurrent Protection Devices (OCPD) as required by
National Electric Codes and other prevailing regulations.
WARNING:
Power-One DOES NOT provide AC output overcurrent protection. To
reduce the risk of fire, connect only to a circuit provided with 20A
maximum branch circuit overcurrent protection in accordance with the
National Electric Code (ANSI/NFPA 70).
Make all electrical connections (e.g. conductor termination, fuses, PE
connection, etc.) in accordance with the electrical standards prescribed by
the applicable National Electric Code, ANSI/NFPA 70 wiring methods
and/or by other local regulations and codes.
CAUTION:
The AC output (neutral) is not bonded to ground.
The input and output circuits are isolated from the enclosure and the
system grounding shall be installed per the requirements of the National
Electric Code, ANSI/NFPA 70, and is the responsibility of the installer.

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Part 1 Introduction and Safety
1.2.2 APPROPRIATE USAGE
CAUTION:
Power-One
accepts NO liability for damage of any kind that may arise from incorrect
or careless operation. The equipment must not be used in ways that do not fall
within the intended field of use.
1.2.2.1 Intended or Allowed Use
This equipment is
a MICRO inverter designed to transform direct current (DC) coming from a
photovoltaic module (PV) into an alternating current
( AC ) suitable for being fed into the power
distribution grid.
This MICRO Inverter is designed for outdoor use, but can be used indoors if installed according to
the National Electric Code and abiding by specified environmental and mounting parameters as
stated in this manual (see Environmental Conditions section 1.2.2.3 and General Installation
Conditions section 2.2.2).
1.2.2.2 Conditions of Use
The operating current output during the normal operation MUST NOT exceed the limits
documented in
the technical specifications.
Only one photovoltaic module can be connected in the input of the inverter ( DO NOT connect
batteries or other sources of power supply).
The inverter can be connected to the electricity grid in qualified countries ONLY.
The inverter can be used only if all the technical characteristics are observed and applied.
1.2.2.3 Environmental Conditions
Adverse environmental condition, such as: sun, rain, snow, wind, too hot or too cold, altitudes,
humidity, etc., can lead to a reduction in performance.

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Part 1 Introduction and Safety
1.2.2.4 Improper or Prohibited Use
The following actions are dangerous and strictly forbidden under the terms of the warranty:
•Installing the equipment in environments with flammability conditions or in
adverse/constrained environmental conditions (temperature and humidity).
•Using the equipment with safety devices not working or disabled.
•Using the equipment or parts of the equipment by connecting it to other machines or
equipment, unless otherwise expressly allowed in this manual.
•Modifying the operating parameters that are restricted to the installer.
•Cleaning with corrosive products that may corrode parts of the equipment or generate
electrostatic charges.
•Using or installing the equipment or its parts without having read and correctly interpreted
the contents of the operating and maintenance manual.

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Part 1 Introduction and Safety
1.2.3 SAFETY INSTRUCTIONS
Warning – These servicing instructions are for use by qualified personnel only.
To reduce the risk of electric shock, do not perform any servicing other than that
specified in the operating instructions.
Be sure all flammable materials including construction items are away from the unit. Do not install
the inverter in or near potentially explosive areas.
Normally grounded conductors may be ungrounded and energized when a ground-fault is indicated
resulting in risk of electric shock. Test voltage with a voltmeter before touching.
Do not connect an AURORA MICRO inverter to the electrical distribution grid until after the receipt
of a letter of authorization from the authority having jurisdiction.
Install the AURORA Inverter in accordance with the electrical standards prescribed by the
applicable National Electric Code (NEC), Canadian Electric Code (CEC), and/or by other local codes
and regulations.
Use personal protective equipment; including gloves and eye protection when working on this unit.
1.2.3.1 General Information
The equipment has been manufactured in accordance with the strictest accident-prevention
regulations and supplied with safety devices suitable for the protection of components and
operators. Inform the manufacturer about non-standard installation conditions.
Maintenance operations must be carried out according to the Maintenance section in Part 6 of this
manual.
The connection of an inverter energy system to an electrical installation connected to the electricity
distribution network shall be approved by the appropriate electric utility.
It is essential to provide operators with correct information. They must therefore read and comply
with the technical information given in the manual and in the attached documentation.

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Part 1 Introduction and Safety
The instructions given in the manual do not replace the safety devices and technical data for
installation and operation mounted on the product. They do not replace the safety regulations
enforced in the country of installation and common sense rules.
The manufacturer is willing to train staff, at its premises or on site, in accordance with conditions to
be set out in the contract.
Do not use the equipment if any operating anomalies are found. Avoid temporary repairs.
All repairs should be carried out using only qualified spare parts, which must be installed in
accordance with their intended use and by a licensed contractor or authorized Power-One Service
representative.
Liabilities arising from commercial components are delegated to their respective manufacturers.
1.2.3.2 Thermal Hazard
Warning - Certain parts may be extremely hot immediately following shut down
due to normal elevated surface temperatures (e.g. transformers, accumulators,
coils etc.).
Prior to touching any part of the inverter use care to ensure surfaces and equipment are at touch-
safe temperatures and voltage potentials before proceeding.
Anytime the inverter has been disconnected from the power network, use extreme caution as some
components can retain charge sufficient to create a shock hazard. To minimize occurrence of such
conditions, comply with all corresponding safety symbols and markings present on the unit and in
this manual.

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Part 1 Introduction and Safety
1.2.4 LOCATION OF SAFETY LABELS
Please note the location of the safety notices on the AURORA MICRO inverter. These and the
product nameplates are for notification and protection.
Figure 1-1: Safety label location
The labels and plates attached to the equipment must NOT be removed, damaged, hidden, etc. They
must be cleaned regularly and kept visible at all times. This means they must NOT be hidden with
objects and extraneous parts (rags, boxes, equipment, etc.).
The technical data shown in this manual does not replace those shown on the plates attached to the
equipment.

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Part 1 Introduction and Safety
1.2.1 OTHER LABELS
In addition to the safety label and product nameplate,there is one identification label on the
inverter. A duplicate label is attached in a plastic bag as shown below and will be used later to fill in
the “system map” for the monitoring software. It is recommended to make a copy of the “system
map” for the installer.
Figure 1-2: Identification label for adhering to system map