AC Module
Installation Guide Content
© 2011- 2012 ET Solar Group All Rights Reserved. No part of this publication may be reused in any manner nor in any form or format without prior written permission from ET Solar Group.
ET Solar Group
97 Jiangzhou South Roud Taizhou, China, 225300
Phone: +86 523 8639 0333 • Fax: +86 523 8639 0233
Trademarks
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Disclaimer
The information contained in this manual is based on ET Solar Group’s knowledge and experience, but such information and suggestions do not constitute a warranty expressed or implied. The methods of installation, use and maintenance of ET Solar AC Module are beyond the control of ET Solar Group. ET Solar Group assumes no responsibility and expressly disclaims liability for any loss, damage or expense associated with the use, installation or operation of the ET Solar AC Module. Any liability of ET Solar Group is strictly limited to the Limited Warranty. ET Solar Group reserves the right to make changes to product specifications or to this manual without notice.
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Content
Read this First! ... 2
IMPORTANT SAFETY INSTRUCTIONS - SAVE THESE INSTRUCTIONS ... 2
FCC Compliance ... 4
Introduction ... 6
Components of an AC Module ... 6
Grounding in the AC Cables ... 7
Three-Phase Installation ... 8
Module Layout Diagram ... 9
Connecting Latching Cables ... 11
Disconnecting Latching Cables ... 12
Module Preparation ... 13
Preparing the Modules ... 14
Preparing the Last Module in the String ... 15
Module Installation ... 16
Installing the Modules ... 16
Examples ... 19
Junction Box - Top Right ... 19
Junction Box - Top Left ... 20
Two Strings – Two rows each ... 21
Two Strings – Single Rows ... 22
Landscape – Two Strings ... 23
Three-line Diagram ... 24
Single-Phase 240 V Diagram ... 24
Three Phase 208 V Diagram ... 25
AC Wiring Accessories ... 27
Technical Specifications ... 31
Read this First!
This document contains important information and instructions to safely install an array of alternating current photo-voltaic (AC) solar modules. Failure to follow these instructions can result in equipment damage or failure, or personal injury, and might void the system warranty.
The following symbols are used throughout this document to alert you to important safety information that you will need during the installation:
This symbol indicates that failure to follow instructions may result in serious hardware failure. Use caution when completing this task.
This symbol indicates that failure to follow instructions may result in serious personal injury. Use extreme caution when completing this task.
IMPORTANT SAFETY INSTRUCTIONS - SAVE THESE
INSTRUCTIONS
• Perform all electrical installations in accordance with any local codes, the National Electrical Code (NEC) ANSI/NFPA 70 for US installations, or the Canadian Electrical Code Part I, CSA C22.1 for Canada.
• This unit or system is provided with fixed trip limits and shall not be aggregated above 30 kW on a single Point of Common Connection. See "Utility Interaction" on page 33 for voltage and frequency trip limits.
• This AC module is intended for operation in an environment having a maximum ambient temperature of 85℃.
• Work with the local electric company and authorities having jurisdiction (AHJ) before, during, and after the installation of the solar electric system. The following are examples of possible requirements the electric company might have regarding the installation:
• An upgrade of the existing meter
• A readily accessible AC system disconnect and a diagram showing its placement • An inspection or approval before connecting the system to the utility grid • Qualified personnel or electric company employee to connect the system to the
utility grid
WARNING: Shock Hazard. AC wiring from the utility to the array junction box is energized by both utility dedicated branch circuit(s) and AC modules rated as "Utility Interactive". Opening the array's dedicated branch disconnect will also cause the AC modules to stop producing
www.etsolar.com power. Proper safety procedures must be followed when installing or accessing the dedicated branch circuit wiring, which includes unplugging the AC Modules from the dedicated branch circuit.
• The AC module interconnecting cable system includes an internal equipment grounding conductor (EGC) connected to each module through pluggable connectors with a longer ground pin.
• The AC module does NOT require a DC or AC grounding electrode conductor (neutral) at the inverter, and the neutral within the AC module is isolated from ground.
• The AC module must be connected to a dedicated branch circuit from an AC supply system with the neutral referenced to ground at the building or structure electrical service entrance.
• The connector on the AC interconnecting cables is rated for disconnect under load and can be used as an NEC disconnect device. Some AHJs might require a separate
disconnect next to the AC module system as well as a readily accessible disconnect. • The AC cables and connectors are listed for outdoor use, are rated for 20A, and have
insulation rated to a minimum temperature of 90C. These cables are listed for use with AC modules.
• The AC dedicated branch circuit wiring from the readily accessible disconnect to the AC module array must include an equipment grounding conductor (EGC) run in the same raceway or cable as the AC circuit conductors. This EGC must be connected to the green colored conductor of the transition cable, which is part of the AC module interconnecting cable system.
• The AC module interconnecting cable system provides an internal EGC for grounding the AC modules only. Other metal structures, such as mounting systems, must be grounded per code.
• If a module is removed from within the string, it is recommended that you bridge the gap in the string using an AC extension cable. Inserting an extension cable maintains ground continuity to subsequent modules in the string. See "AC Wiring Accessories" on page 27 for a list of available extension cables. Other auxiliary grounding methods may be used.
• The metal components of the AC module, including frame and microinverter, can reach temperatures of approximately 80C or more under extreme environmental conditions. To reduce risk of burns, use appropriate safety procedures when handling.
CAUTION: To reduce the risk of fire, connect only to a circuit that has a dedicated 20 amperes maximum overcurrent protection in accordance with the National Electrical Code, ANSI/NFPA
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www.etsolar.com Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.
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Grounding in the AC Cables
The AC cable attached to the microinverter and all accessory cables are fully insulated and contain an equipment grounding conductor (EGC). The full ground path from the transition cable to the module frame follows:
• The transition cable's green conductor is connected to the EGC from the utility dedicated branch circuit.
• All connectors have green ground contacts that are longer than the circuit contacts. This extra length ensures the ground is the first to make contact when connecting modules and the last to break contact when disconnecting modules.
• The AC ground wire inside the microinverter makes a bolted termination to the microinverter chassis and is environmentally sealed.
• The microinverter chassis is bonded at the factory to the module frame with stainless steel hardware to provide ground continuity to the AC PV module frame.
The AC cable grounding path has been tested by a NRTL. Before an AC module assembly can be labeled with the NRTL certification mark and shipped from an authorized and inspected factory, each assembly must pass a ground continuity check to verify electrical continuity from the AC cable ground contact to the module frame.
The AC cable provides equipment grounding for the AC module only. It is the installer's responsibility to ensure that any metallic parts in contact with the module (i.e. mounting systems) are provided with a means of equipment grounding according to the manufacturer’s instructions and local code.
Because the DC power is internal to the module, a grounding electrode conductor (GEC) is not required.
Because the AC modules are connected in a “daisy chain” fashion, disconnecting one module from within the string removes power and ground from subsequent modules in the string. Extreme care should be taken to ensure that no other energized sources are adjacent to these ungrounded modules, or auxiliary grounding methods must be provided.
If a module is removed from within the string, it is recommended that you bridge the gap in the string using an AC extension cable. Inserting an extension cable maintains ground continuity to subsequent modules in the string. See "AC Wiring Accessories" on page 27 for a list of available extension cables. Other auxiliary grounding methods may be used.
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www.etsolar.com • 16 amps /1.14 nominal current = 14 modules per branch circuit
• 1.14 x 14 modules= 15.96 amps ≤ 16 amps
Module Layout Diagram
A module layout diagram is a paper model describing the configuration of the array and the placement of each module in the array. Following the installation, this information is recreated within the monitoring tool enabling the module owner, service providers, and system administrators to monitor the performance of each module.
The layout diagram uses the serial number of the microinverter to identify where each module is installed in the array.
Use the module layout template below to create a module layout diagram of your installation site.
1. Fill in the data requested at the top of the table.
2. Before a module is installed, peel the serial number sticker from the mid-cable junction. 3. Place the sticker in the same location in the table relative to the microinverter's position
in the actual array.
4. Fill in the sheet number information at the bottom of the table.
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Module Preparation
The preparation steps described in this section apply to a large majority of the modules you will install. Occasionally, however, situations will dictate that the cables be routed differently. Or, your individual experiences will determine steps or cable management techniques that work better for you or, more importantly, for your inspectors.
Before you begin preparing the modules for installation, consider the following items, which might require changes to the cable management of one or more modules:
• Where is the junction or transition box located in relation to the module that will connect to it?
Whether the box is located to the left or right of the array (as viewed from the ground facing the installed array) determines which transition cable you need (male or female) and what preparation is needed for the final module in the string. With the junction or transition box to the left, a female transition cable is required. The final module in the string will require an end cap be plugged into the mid-cable junction. With the junction or transition box to the right of the array, a male transition cable is needed. The final module will require additional cable management to secure the end of the AC cable. Before connecting the transition cable, calculate the distance from the transition box to the module plus the distance under the module to reach the appropriate AC connector. This will determine the length of transition cable that you will need.
How will you manage the transition cable? If the transition box is under the module, you might be able to use the module's cable clips to secure the transition cable to the module frame.
NOTE: Always place cable clips at least three inches from a plug or mid-cable junction to ensure proper stress relief.
• Do you need any extension cables? Will the extension cable reach from connector to connector or is it necessary to modify the standard cable management of one or both modules to make the connection easier?
How will you manage the extension cables? If the extension cables will connect two rows of modules in the same string, use cable clips to secure the transition cable to the module frame. Including waves or loops in the cable between clips can help manage slack.
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This section describes how to lay down and interconnect AC modules on a previously installed mounting system. No attempt is made to describe how to install the mounting system on the roof or how to use module clamps.
Before installing the mounting system, ensure that mounting rails will be positioned below the microinverter once the module is installed. The microinverter extends beyond the edge of the frame of most modules. Do not install modules with the microinverter resting on the mounting rail.
The frame of the installed module must rest firmly on the mounting rail. Installing a module with the microinverter resting on the rail and uneven contact between the frame and the rail can cause damage to the
microinverter and the module.
The metal components of the AC module, including frame and
microinverter, can reach temperatures of approximately 80℃. To reduce risk of burns, use appropriate safety procedures when handling.
Installing the Modules
The ideal installation path is to begin closest to the installed transition box and plug in each module as you move away from the box. Depending on the configuration of your array and the location of the transition box, this path may not be feasible. For example, in a 2-row
configuration, we recommend installing the bottom row first and working up toward the transition box, which is likely mounted higher up the roof.
The following diagram shows two installed modules as viewed from the bottom or underside of the module.
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4. Install the second module.
5. Reach under the top edge of the first module and plug in the AC cable from new module. Close the latch.
NOTE: For end- or edge-mount racking systems, it might be necessary to lift the top of the module slightly above the frame to reach the plug.
6. Repeat steps 4 and 5 until you reach the end of the row.
See "Module Preparation" on page 13 for information on preparing the final module in the string.
If the string will continue to another row, then an extension cable is needed. Plug the extension cable into the current module and place it in the general vicinity of where the next module will be installed. Use appropriate cable management strategies to secure the extension cable.
NOTE: For rail mount systems, lay the extension cable over the rails on which the next module will be installed. This ensures that the cable remains under the module for protection from the sun and uses the rails to keep the cable off the roof surface. Once the module is installed, you can also secure the cable to the module frame with cable clips, if necessary.
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www.etsolar.com
Technical Specifications
Parameter 208V 240V
Peak Power (Pmax) 250W
Module Efficiency 15.37%
Maximum Power Voltage (Vmp) 30.02V
Maximum Power Current (Imp) 8.33A
Open Circuit Voltage (Voc) 37.58V
Short Circuit Current (Isc) 8.98A
Power Tolerance ±3%
Maximum System Voltage DC1000V
Normal Operating Cell Temperature 45.3±2℃
Temp. Coeff. Of Pmax -0.43%/℃
Output power factor rating 0.99 0.99
Operating voltage range (ac) (L-L) 2 183-229 V 211 – 264 V
Operating frequency range or single frequency1 59.3 - 60.5 Hz 59.3 - 60.5 Hz
Number of phases 13 14
Nominal output voltage (ac) 208 V 240 V
Normal output frequency 60 Hz 60 Hz
Maximum continuous output current (ac) 1.14 A5 0.992 A4
Maximum output power (ac) 238 W 238 W
Utility interconnection voltage and frequency trip limits and trip times See "Utility Interaction" on page 33 Total Demand Distortion (TDD) /Individual harmonics (per IEEE 1547) < 5%
(Passed up to 40th harmonic)
2
See "Utility Interaction"
3
Single-phase device requiring two of the phases (L1 and L2, L2 and L3, or L1 and L3) for power production along with a neutral for voltage sensing only, per IEEE 1547.
Parameter 208V 240V Maximum units per 2-pole 20 amp dedicated branch circuit 145 166
Maximum output fault current (ac) and duration 11.9 Apk, 0.31 Arms, total duration 1.2 ms
Maximum output overcurrent protection 20 A5 20 A5
Dimension 1640x992x57.5mm 64.57x39.06x2.26 inch
Weight 21.59kg
47.59 lbs
Cooling Natural Convection/No Fans
Protection Level IP 65(NEMA 6)
6
This is the maximum number of microinverters that can be connected in parallel to a single dedicated branch circuit, which is protected by a 2-pole circuit breaker rated at 20 A. This number is derived based on the requirements of the National Electrical Code (NEC) and the current rating of the microinverter. If more microinverters than this number need to be installed, additional 20-A branches shall be used, keeping the number of microinverters on each branch less or equal to this number.
Uti
a - N b - N c - Trility Inter
on-adjustable m ominal voltage rip limit accurac
