FCC ID: X3R-TKKR DC/DC Converter for use in Photovoltaic applications

Ampt String Optimizer V1500-30 Series Installation Manual

(PRELIMINARY) 57070016-1 v20201023 hdpv.org Copyright 2020 Ampt, LLC. All rights reserved. PRELIMINARY 2 String Optimizer V1500-30 Series Installation Manual: 57070016-1 v20201023 Copyright 2020 Ampt, LLC. All rights reserved. No part of this document may be reproduced, retransmitted, or copied in any form without the expressed and written permission of Ampt, LLC. This document contains information needed to install and commission an Ampt optimizer

(including Smart String Technology optimizers, String Stretch optimizers, Ampt Mode optimizers, String View optimizers, V-match optimizers, and Direct-to-Battery optimizers) within a photovoltaic (PV) installation. The result? Energy realized. All Ampt trademarks are the property of Ampt LLC. All trademarks are recognized even if they are not marked separately. Visit www.ampt.com/trademarks for a list of Ampt trademarks. Any unauthorized use of Ampt trademarks is prohibited. All other trademarks are the property of their respective owners. U.S. and international patents apply to this product. For details visit:

www.ampt.com/patents. Read This First To help avoid problems during the system installation, familiarize yourself in advance with the installation process by reading this entire document before starting the installation. Risk of electric shock, do not remove covers. No user serviceable parts inside. Refer servicing to qualified service personnel. When the photovoltaic array is exposed to light, it supplies a dc voltage to this equipment. Le risqu de dcharge lectirque nenlnvent pas la couverture. Aucunes pieces utiles dutilisateur lintrieur. Rfrez-vous lentretien au personnel de service qualifi. Quand la range photovoltaque est expose la lumire. Il fournit une tension CC cet quipement. Hot surfaces to reduce the risk of burns do not touch. Les surfaces chaudes - pour rduire le risque de brlures - ne se touchent pas. Copyright 2020 Ampt, LLC. All rights reserved. PRELIMINARY 3 String Optimizer V1500-30 Series Installation Manual: 57070016-1 v20201023 IMPORTANT SAFETY INSTRUCTIONS This manual contains important instructions for Ampt optimizers that shall be followed during installation and maintenance. The optimizer has been designed and tested according to international safety requirements, but requires certain precautions are observed when installing and/or operating the optimizer. To reduce the risk of personal injury and to ensure the safe installation and operation of the optimizer, please be sure you carefully read and follow all instructions and safety messages in this manual. SAVE THESE INSTRUCTIONS Safety Message Types The following messaging is used to identify a hazard to equipment or personnel:

DANGER Indicates a hazardous situation which, if not avoided, will result in death or serious injury. WARNING Indicates a hazardous situation which, if not avoided, could result in death or serious injury. CAUTION Indicates a hazardous situation which, if not avoided, could result in minor or moderate injury. NOTICE Indicates information considered important but not hazard, or personal injury, related - for example, property damage. Copyright 2020 Ampt, LLC. All rights reserved. PRELIMINARY 4 String Optimizer V1500-30 Series Installation Manual: 57070016-1 v20201023 General Safety Installation and maintenance should be performed only by qualified persons. Installers and maintenance personnel assume the risk of all injury that might occur during installation or maintenance including, without limitation, the risk of electric shock. Follow your safety procedures and protocols. All electrical installations must be done in accordance with the local and National Electrical Code ANSI/NFPA 70; Canadian Electrical Code, Part I; or the applicable standards, codes, and regulations for your region. Failure to follow this manual will void warranty. The Ampt product contains no user-serviceable parts. All repairs and maintenance should be handled in accordance with the instructions and terms contained in the product warranty. Before installing or using the Ampt optimizer, read all instructions and safety messages on the optimizer and in this manual. Follow the safety precautions for this product as well as the other components in the PV system. PV modules produce electrical energy when exposed to light and thus can create an electrical shock hazard. Wiring of the PV modules should only be performed by qualified personnel. NOTICE Opening the optimizers, performing any other service to the optimizers, or using the optimizers in a way that is not specified by the manufacturer voids warranty. Copyright 2020 Ampt, LLC. All rights reserved. PRELIMINARY 5 String Optimizer V1500-30 Series Installation Manual: 57070016-1 v20201023 Disclaimer of Liability Ampt makes no representations, expressed or implied, that 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. Ampt shall not 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.) The following information is subject to change without notice, even though every attempt has been made to make this document complete, accurate and up to date. Readers are cautioned, however, that Ampt 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. WARNING Any use of the Ampt String Optimizer that is not expressly authorized in this manual or associated documentation is expressly prohibited by Ampt. Ampt disclaims any responsibility or liability for such prohibited use. Copyright 2020 Ampt, LLC. All rights reserved. PRELIMINARY 6 String Optimizer V1500-30 Series Installation Manual: 57070016-1 v20201023 Table of Contents Read This First ......................................................................................................................... 3 IMPORTANT SAFETY INSTRUCTIONS ............................................................................................................. 4 Safety Message Types ................................................................................................................................... 4 General Safety ............................................................................................................................................... 5 Disclaimer of Liability .................................................................................................................................... 6 Chapter 1: Product Overview .......................................................................................... 9 Dimensional Drawings ........................................................................................................... 10 Physical Overview .................................................................................................................. 11 Bar Code Label ....................................................................................................................... 11 Specifications ......................................................................................................................... 12 V1500-30 Series .......................................................................................................................................... 12 Chapter 2: Planning Installation..................................................................................... 13 Overview ............................................................................................................................... 13 PV System Configurations ...................................................................................................... 13 Ungrounded PV Systems ............................................................................................................................. 13 Resistively Grounded PV Systems (positive or negative) ............................................................................ 13 Acceptable Input Configurations ............................................................................................ 14 Optimizer Input Requirements ................................................................................................................... 14 Fuses ..................................................................................................................................... 15 Understanding Maximum Output Current and Fuse Sizing ........................................................................ 15 Input Fuses .................................................................................................................................................. 15 Two-in-Portrait Wiring ........................................................................................................... 16 DC-coupled Storage ............................................................................................................... 16 Connector Polarity ................................................................................................................. 17 Chapter 3: Installing the Ampt String Optimizer ............................................................. 18 Getting Started ...................................................................................................................... 18 Parts and Tools Needed .............................................................................................................................. 18 Mounting and Grounding the String Optimizer ....................................................................... 19 Steps............................................................................................................................................................ 19 Making Electrical Connections ................................................................................................ 20 Connection/Disconnection Order Matters ................................................................................................. 21 Connecting the Inputs ................................................................................................................................. 21 Connecting the Output ............................................................................................................................... 24 Uninstalling an Optimizer ....................................................................................................... 25 Parts and Tools Needed .............................................................................................................................. 25 Copyright 2020 Ampt, LLC. All rights reserved. PRELIMINARY 7 String Optimizer V1500-30 Series Installation Manual: 57070016-1 v20201023 Steps ........................................................................................................................................................... 25 Appendix ........................................................................................................................ 27 Compliance ............................................................................................................................ 27 Model Numbering System ......................................................................................................................... 27 Markings..................................................................................................................................................... 28 FCC Compliance .......................................................................................................................................... 29 RSS-GEN ..................................................................................................................................................... 29 Avis IC ......................................................................................................................................................... 30 RSS-GEN ..................................................................................................................................................... 30 Reference: Electrical Connection Order ................................................................................... 32 Mechanical Installation Best Practices ....................................................................................................... 33 Electrical Commissioning Best Practices .................................................................................................... 33 Ampt Support Contacts .............................................................................................................................. 33 Copyright 2020 Ampt, LLC. All rights reserved. PRELIMINARY 8 String Optimizer V1500-30 Series Installation Manual: 57070016-1 v20201023 Chapter 1:

Product Overview Ampt String Optimizers are DC/DC converters with multiple features that lower the cost and improve the performance of new and existing PV systems. Dual MPPT per optimizer - Ampt String Optimizers put maximum power point tracking on each of its two input strings of PV modules. This mitigates or eliminates mismatch losses to deliver more energy under changing environmental and system conditions over the lifetime of the power plant. High Fixed-Voltage Bus (HFVB) Ampts advanced DC power management technology allows for HFVB system designs which turn the variable voltage of the PV array into a fixed and predictable DC bus voltage to achieve system-level economic advantages. HFVB designs lower the cost per watt of inverters, battery converters, and trackers while reducing ampacity requirements and the number of home runs. Ampts HFVB technology can also restore lost revenue from underperforming systems suffering from voltage sag. Ampt Mode Inverters with Ampt Mode operate in a fixed or narrow input voltage range that is closer to the maximum system voltage. This allows the inverter to deliver a higher AC output voltage at the same current which raises the rated output power of the inverter to lower the inverter's cost per watt. Direct-to-Converter For DC-coupled energy storage systems, Ampt String Optimizers include Direct-to-Converter technology which allows the DC bus to operate at a higher fixed voltage so the converter only needs to buck when charging and boost when discharging. This simplified operation reduces battery converter costs by up to 50% with less circuitry and a higher power density. High DC/AC Ampts unique combination of output current limits and a higher DC bus voltage allows PV system designers to achieve optimal DC/AC ratios (up to 3:1). With Ampt, system owners can expand the DC power on existing systems without replacing inverters, combiners, or cables; optimize inverter utilization on new systems to lower the cost per watt; and lower capex while increasing storage durations on systems with DC-coupled energy storage. V-match Ampts patented V-match technology allows the output of our optimizers to match the DC bus voltage set by the inverter or battery while delivering full available power from the PV modules. This uniquely allows PV arrays with Ampt to automatically adapt to legacy or future power equipment to repower existing systems, upgrade inverters, mix new and legacy PV modules, deploy optimized DC-coupled storage systems, and other applications. Wireless Communication Ampt String Optimizers incorporate optional wireless communication to provide string-level data that is highly accurate, synchronous, and scalable to improve O&M, as well as enhanced controls for storage applications. For more information on Ampts product features and applications, visit www.ampt.com. Copyright 2020 Ampt, LLC. All rights reserved. PRELIMINARY 9 String Optimizer V1500-30 Series Installation Manual: 57070016-1 v20201023 Dimensional Drawings The dimensions for the String Optimizer shown below are in millimeters and inches. 0 0 1 4 9 3

. 220 8.66 208 8.19

. 8 0 5 2 0 2 4 4 5 6 1

. 6 6 4 5 3 8 1

. 4 8 0 1 7 2 4

. 6 1 0 1 4

. 6 1 0 1 4 Figure 1: Dimensional drawings Copyright 2020 Ampt, LLC. All rights reserved. PRELIMINARY 10 String Optimizer V1500-30 Series Installation Manual: 57070016-1 v20201023 Physical Overview Mounting holes

(6.5 mm) x 6 Grounding stud

(10-32) x 2 Input 2 connectors

Input 1 connectors Figure 2: Physical overview of the string optimizer Output connectors Bar Code Label The image below shows the bar code label with model and serial numbers. Bar code label Figure 3: Bar code tag with the model and serial numbers Copyright 2020 Ampt, LLC. All rights reserved. PRELIMINARY 11 String Optimizer V1500-30 Series Installation Manual: 57070016-1 v20201023 Specifications V1500-30 Series Electrical Input Maximum current per input Maximum Isc per input V A A V V V A Startup voltage per input Number of inputs Output Maximum output current Max continuous output power kWdc Efficiency (max, CEC, Euro)

Mechanical Input & output connector Dimensions Weight Ambient temperature operating range Cooling Environmental Environmental category Pollution degree Maximum operating altitude Overvoltage category Ingress protection General Maximum system voltage Compliance Maximum voltage per input 1350 1350 1350 1350 1350 1350 1350 1350 V1250-30 V1275-30 V1300-30 V1325-30 V1350-30 V1375-30 V1400-30 V1415-30 24 26 390 2 24 26 390 2 24 26 390 2 24 26 390 2 24 26 390 2 24 26 390 2 24 26 390 2 MPP tracking voltage range 300-1200 300-1225 300-1250 300-1275 300-1300 300-1300 300-1300 300-1300 Output voltage range 0-1250 0-1275 0-1300 0-1325 0-1350 0-1375 0-1400 0-1415 30 35.2 30 35.9 30 36.7 30 38.2 30 38.9 30 39.7 30 40.1 24 26 390 2 30 37.4 18.35" x 8.66" x 3.94"

(466.1 mm x 220 mm x 100 mm) 99.6 / 99.5 / 99.4 MC4-Evo 2 17.8 lbs. (8.1 kg)

-40 F to +122 F

(-40 C to +50 C) Convection 9843 ft (3000 m) Outdoor 2 OVII IP66 / 4X 1500 V ETL to UL 1741;

IEC 61000-6-1, 61000-6-3, 62109; CE;

Giteki 2-1-19; FCC Part 15, class A 1. Voc at coldest design temp. Follow Ampts design guidelines to determine the number of modules per input and max. system voltage. 2. Maximum Imp of modules on the input at standard test condition (STC) - irradiation level of 1000 W/m2 at 25C. 3. Maximum short-circuit current (Isc) of modules on input. 4. For system designs where the DC bus voltage is always greater than optimizer input voltage. See manual for details. 5. Optimizer derates above this altitude. Copyright 2020 Ampt, LLC. All rights reserved. PRELIMINARY 12 String Optimizer V1500-30 Series Installation Manual: 57070016-1 v20201023 Chapter 2:

Planning Installation Overview This chapter explains the installation requirements that ensure proper operation of the String Optimizer. NOTICE The inputs of the optimizer are not intended for connection to a battery or any other type of DC source except PV modules. PV System Configurations String Optimizers can be installed in ungrounded and resistively grounded PV systems. Notice that input configurations can vary. See Acceptable Input Configurations section for details. Ungrounded PV Systems Input configurations vary by system design Figure 4: Electrical connections for an ungrounded PV system Resistively Grounded PV Systems (positive or negative) Input configurations vary by system design Figure 5: Electrical connections for a grounded PV system Copyright 2020 Ampt, LLC. All rights reserved. PRELIMINARY 13 String Optimizer V1500-30 Series Installation Manual: 57070016-1 v20201023 Acceptable Input Configurations Each input of the optimizer can have multiple PV strings of the same length in parallel. Each PV string in parallel, on a given input, should have the same open-circuit voltage (Voc-cold). Same Voc-cold Same Voc-cold Figure 6: Example - Two strings in parallel on each input Figure 7: Example - Three strings in parallel on each input When the number of modules on each input is not the same, the input with the highest power should be connected to input 1. Note:

For inputs with a single string, like Input 2 shown here, a fuse may or may not be needed to protect the modules in case of an array fault. See Fuses section for more information. Figure 8: Strings with the highest power should be connected to Input 1 Optimizer Input Requirements Inputs 1 and 2 of the String Optimizer have the following requirements for the optimizer to operate at maximum power point (MPP):

Voc-cold-in1 Optimizers Maximum voltage per input Voc-cold-in1 Inverter maximum input voltage Vmp-hot-in1 > (Vout 2) Vmp-hot-in2 > (Vout 2) Vmp-cold-in1 < Vout Vmp-cold-in2 < Vout Voc-cold-in1 Voc-cold-in2

(Pin1 2) < Pin2 Pin1 Vout = voltage at the output of the optimizer, which includes the voltage set by the inverter (or battery converter) plus line losses The input configurations of different optimizers within the same PV array can vary so long as they meet the defined criteria. Copyright 2020 Ampt, LLC. All rights reserved. PRELIMINARY 14 String Optimizer V1500-30 Series Installation Manual: 57070016-1 v20201023 Fuses CAUTION Over-current protection devices and conductors shall be sized in accordance with the National Electrical Code (ANSI/NFPA 70); Canadian Electrical Code, Part I; or the applicable standards, codes, and regulations for your region. Understanding Maximum Output Current and Fuse Sizing The recommended PV system design ensures that the DC bus voltage, which is set by the inverter, is always greater than the optimizer input voltages. For these systems, the maximum output current will be the Maximum output current listed on the optimizers datasheet. This design allows the output current limit of the Ampt String Optimizer to eliminate the need for the 1.25 multiplication factor for over-sun conditions when calculating ampacity. The 1.25 multiplier for continuous use is still required. Optimizer Max Output Current (A) Minimum Fuse Size (A) 12 16 20 24 30 15 20 25 30 37.5 (40 A standard) For other system designs where the DC bus voltage can be less than the voltage on either optimizer input, the potential maximum output current will either be the Maximum output current listed on the optimizers datasheet or the maximum input current whichever is greater. If the maximum output current is the one listed on the optimizer datasheet, use the table above. Otherwise, use your standard fuse sizing method including margins for both over-sun and continuous use. Input Fuses For single PV strings on an optimizer input, an input fuse may be required to protect the modules in the event of an array fault when the maximum series fuse rating for the PV modules is less than the output fuse rating. For parallel PV strings on an optimizer input, always use fuses to protect the PV modules. Copyright 2020 Ampt, LLC. All rights reserved. PRELIMINARY 15 String Optimizer V1500-30 Series Installation Manual: 57070016-1 v20201023 Fuses required on parallel strings to protect PV modules Fuses may be required on single string inputs Figure 9: Single PV strings may, and parallel PV strings must, have input fuses to protect the PV modules. When input fuses are needed, use the appropriate calculations for your jurisdiction to size fuses to ensure that your module strings are protected according to the maximum series fuse rating on the datasheet for the PV modules. Two-in-Portrait Wiring To maximize bi-facial gains or to mitigate shading between fixed-tilt racking or trackers, keep all PV modules connected to a given optimizer input within the same row. Input 1 Input 2 Input 1 on top (or West) row Input 2 on bottom (or East) row Figure 10: Keep all modules on a given optimizer input within the same row to maximize production DC-coupled Storage When used in DC-coupled storage applications, the optimizer does not function as a blocking diode. Copyright 2020 Ampt, LLC. All rights reserved. PRELIMINARY 16 String Optimizer V1500-30 Series Installation Manual: 57070016-1 v20201023 Optimizer Front View Optimizer Top View Output Mating Connectors Top View Connector Polarity Always use the polarity markings on the faceplate instead of any polarity markings on the connectors.

Use the polarity markings on the faceplate to avoid damaging the device. Figure 11: Output connector polarity Copyright 2020 Ampt, LLC. All rights reserved. PRELIMINARY 17 String Optimizer V1500-30 Series Installation Manual: 57070016-1 v20201023 Chapter 3:

Installing the Ampt String Optimizer Getting Started This chapter addresses the proper mounting and installation of the Ampt String Optimizer. Read the entire chapter before starting the procedures and then conduct each task in the order given. Parts and Tools Needed The mounting hardware varies by the type of PV module mounting rail Appropriately rated voltmeter and DC current clamp Stubli crimping tool and disconnect tool MC4-Evo 2 sealing caps (male and female) Copyright 2020 Ampt, LLC. All rights reserved. PRELIMINARY 18 String Optimizer V1500-30 Series Installation Manual: 57070016-1 v20201023 Mounting and Grounding the String Optimizer WARNING Read the warning statements below:

Installation and maintenance should be performed only by qualified persons. Installers and maintenance personnel assume the risk of all injury that might occur during installation or maintenance including, without limitation, the risk of electric shock. Follow your safety procedures and protocols. All electrical installations must be done in accordance with the local and National Electrical Code ANSI/NFPA 70; Canadian Electrical Code, Part I; or the applicable standards, codes, and regulations for your region. The Ampt optimizer is to be installed so that it is not expected to be contacted by persons. CAUTION Keep connectors dry and clean. Do not install Ampt String Optimizers in a location where they might be immersed in water. Steps 1. Mount the String Optimizer to the rack a. See Dimensional Drawings on page 10 b. The recommended practice is to mount the unit parallel to the PV modules with the connectors facing downward. c. Ensure sufficient spacing such that the safety icons as well as the serial and model numbers on the bar code label can be read by maintenance personnel. 2. Ground the String Optimizer as required by your local codes using one of the grounding studs provided, or with a listed bonding washer. Copyright 2020 Ampt, LLC. All rights reserved. PRELIMINARY 19 String Optimizer V1500-30 Series Installation Manual: 57070016-1 v20201023 Making Electrical Connections WARNING Read the warning statements below:

Installation and maintenance should be performed only by qualified persons. Installers and maintenance personnel assume the risk of all injury that might occur during installation or maintenance including, without limitation, the risk of electric shock. Follow your safety procedures and protocols. Do not make or break connections under load. Ensure that there are no parallel connections to the string while series connections are being made. Voltage may be present on the output terminals when an input terminal is connected. Voltage builds as modules are connected in series. CAUTION Read the caution statements below:

To reduce the risk of fire, connect the outputs of the Ampt equipment only to conductors with sufficient ampacity based on the maximum output fault current (maximum optimizer output current) for the chosen optimizer. Over-

current protection devices and conductors shall be sized in accordance with the National Electrical Code (ANSI/NFPA 70); Canadian Electrical Code, Part I; or the applicable standards, codes, and regulations for your region. Over current protection is required for the DC output circuit in the installation. Ampt recommends that a disconnect switch be included in the installation for the DC output. Do not put stress on the optimizer connectors at any time. The cable management method must prevent tension on each connector and movement of the connecting wires at all times. Tracker installations must avoid tension on the connectors throughout its rotation. NOTICE Read the notice statements below:

Failure to follow these instructions will void warranty. Copyright 2020 Ampt, LLC. All rights reserved. PRELIMINARY 20 String Optimizer V1500-30 Series Installation Manual: 57070016-1 v20201023 Failure to follow the prescribed connection and disconnection order can result in damage to the device. Follow these instructions to avoid damaging the device. Follow polarity markings on the optimizer faceplate. Do not cross-wire inputs or output. Use only MC4-Evo 2 mating connectors or connectors manufactured by Stubli that are recognized as being part of the MC connector family with the appropriate rating. Per Canadian Electrical Code, the installer is required to mark the device with the following wording or equivalent, located on or adjacent to each wiring compartment giving access to high voltage circuits, only if actually connected to high voltage in the installation:

DANGER HIGH VOLTAGE or DANGER XXXX V where XXXX is replaced by the rated voltage. Connection/Disconnection Order Matters The following label on the optimizer faceplate serves as a field reference to ensure proper connection/disconnection order to avoid damaging the device. It is not meant to replace the instructions that follow. Figure 12: Connection order label on the optimizer faceplate Connecting the Inputs 1. Read the warning, caution, and notice statements starting on page 20. 2. Make sure that the unit is properly mounted and grounded. 3. Make sure the strings of PV modules that will be connected to the inputs of the optimizer meet the acceptable input criteria, fusing, and other requirements outlined in Chapter 2. 4. For optimizer inputs with strings in parallel a. Follow your safety procedures and protocols to prepare each set of PV strings for each optimizer input. i. Connect the PV modules in series for each string. ii. Use an appropriately rated multimeter to verify the voltage and polarity of each PV string before connecting in parallel. Copyright 2020 Ampt, LLC. All rights reserved. PRELIMINARY 21 String Optimizer V1500-30 Series Installation Manual: 57070016-1 v20201023 5. Follow your safety procedures and protocols and use an appropriately rated multimeter to measure the voltage and verify the polarity for the string(s) of modules being connected to Input 1. Figure 13: Check the polarity and gender for PV string 6. Connect the set of PV strings for Input 1 to the INPUT 1 connectors of the String Optimizer. Ensure that the locking mechanisms on the connectors are fully engaged. Figure 14: Connecting Input 1 7. Follow your safety procedures and protocols and use an appropriately rated multimeter to measure the voltage and verify the polarity for the string(s) of modules being connected to Input 2. See Figure 13. Copyright 2020 Ampt, LLC. All rights reserved. PRELIMINARY 22 String Optimizer V1500-30 Series Installation Manual: 57070016-1 v20201023 8. Connect the set of PV strings for Input 2 to the INPUT 2 connectors of the String Optimizer. Ensure that the locking mechanisms on the connectors are fully engaged. Figure 15: Connecting Input 2 9. Follow your safety procedures and protocols to measure the output voltage of the String Optimizer. It should be equal to the maximum value of the Output Voltage Range on the product label (+/- 1.5%). If it is not, contact Ampt. Optimizer output from PV from PV Output Voltage Range on the product label Figure 16: Verify proper installation 10. If you are connecting the output now, then proceed to the next section. Otherwise, use MC4-Evo 2 Sealing Caps to protect the connectors until the output is connected. Copyright 2020 Ampt, LLC. All rights reserved. PRELIMINARY 23 String Optimizer V1500-30 Series Installation Manual: 57070016-1 v20201023 Connecting the Output 1. Read the warning, caution, and notice statements starting on page 20. 2. Make sure you have completed all the steps in the Connecting the Inputs section starting on page 21. 3. Follow your safety procedures and protocols to ensure the output cables are appropriately terminated and not under load. 4. Connect the output cables to the OUTPUT connectors of the String Optimizer.

Use the polarity markings on the optimizer faceplate to avoid damaging the unit. Figure 17: Connecting the output connectors 5. Ensure that the locking mechanisms on all connectors are fully engaged. 6. Ensure that the cable management method prevents tension on each optimizer connector at all times. Ensure locking mechanisms on all connectors are fully engaged The cable management method must prevent tension on each connector and avoid movement of the connecting wires at all times. Figure 18: Verify that the connectors are fully engaged and manage cables to prevent tension on the connectors Copyright 2020 Ampt, LLC. All rights reserved. PRELIMINARY 24 String Optimizer V1500-30 Series Installation Manual: 57070016-1 v20201023 Uninstalling an Optimizer WARNING Read the warning statements below:

Installation and maintenance should be performed only by qualified persons. Installers and maintenance personnel assume the risk of all injury that might occur during installation or maintenance including, without limitation, the risk of electric shock. Follow your safety procedures and protocols. Do not perform any servicing other than that specified in these instructions. Do not make or break connections under load. Voltage may be present on the output terminals when an input terminal is connected. CAUTION Read the caution statements below:

The Ampt product contains no user-serviceable parts. All repairs and maintenance should be handled in accordance with the instructions and terms contained in the product warranty. The surface of the optimizer may be hot. NOTICE Read the notice statements below:

Failure to follow these instructions will void warranty. Failure to follow the prescribed order can result in damage to the device. Parts and Tools Needed MC4-Evo 2 connector unlocking tool Appropriately rated voltmeter and DC current clamp Steps 1. Read the warning and caution statements above. 2. Follow your safety procedures and protocols to ensure the String Optimizer is not under load. Copyright 2020 Ampt, LLC. All rights reserved. PRELIMINARY 25 String Optimizer V1500-30 Series Installation Manual: 57070016-1 v20201023 3. Follow your safety procedures and protocols to verify that there is zero current flowing through the optimizer circuit by using a current clamp to test each wire connected to Input 1, Input 2, and the output. a. If current is detected on any of these cables, wait for zero irradiance and verify that there is zero current flowing through the optimizer circuit. 4. If no current is detected, then use the MC4-Evo 2 unlocking tool to disconnect connectors in the following order:

a. Output b. Input 2 c. Input 1 Copyright 2020 Ampt, LLC. All rights reserved. PRELIMINARY 26 String Optimizer V1500-30 Series Installation Manual: 57070016-1 v20201023 Appendix Compliance The box is not meant to be user serviced or opened in any way.

Model Numbering System The model numbers for Ampt String Optimizers are in the following format:

315700xx-xxxx (30A models, ranging from 400 1500V) 315700xx-xxxx (24A models, ranging from 400 1500V) 315700xx-xxxx (20A models, ranging from 400 1500V) 315700xx-xxxx (16A models, ranging from 400 1500V) 315700xx-xxxx (12A models, ranging from 400 1500V) where xxxx equals voltage of the unit (e.g. -0750 is a V750; -1325 is V1325). Copyright 2020 Ampt, LLC. All rights reserved. PRELIMINARY 27 String Optimizer V1500-30 Series Installation Manual: 57070016-1 v20201023 Markings 30 A Models Ampt model number Maximum voltage per input (Vdc) Operating voltage range per input

(Vdc) Maximum current per input

(Imp@STC) (Adc) Max PV short-circuit current per input

(Adc) Output voltage range (Vdc) Maximum output current (Adc) Maximum continuous output power

(kWdc) Ambient temperature operating range Enclosure type 24 A Models 20 A Models 16 A Models 12 A Models

[table here]

[table here]

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Copyright 2020 Ampt, LLC. All rights reserved. PRELIMINARY 28 String Optimizer V1500-30 Series Installation Manual: 57070016-1 v20201023 FCC Compliance This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. IMPORTANT! Changes or modifications not expressly approved by Ampt LLC could void the users authority to operate the equipment. Model: TKKR FCC ID: X3R-TKKR IC: 8399A-TKKR

RSS-GEN This device contains license-exempt transmitter(s)/receiver(s) that comply with Innovation, Science and Economic Development Canadas license-exempt RSS(s). Operation is subject to the following two conditions:

1. This device may not cause interference. 2. This device must accept any interference, including interference that may cause undesired operation of the device. Copyright 2020 Ampt, LLC. All rights reserved. PRELIMINARY 29 String Optimizer V1500-30 Series Installation Manual: 57070016-1 v20201023 Avis IC RSS-GEN Cet appareil est conforme la partie 15 des rgles de la FCC. Son fonctionnement est soumis aux deux conditions suivantes: (1) Ce dispositif ne peut causer des interfrences nuisibles, et (2) cet appareil doit accepter toute interfrence reue, y compris les interfrences qui peuvent provoquer un fonctionnement indsirable. IMPORTANT! Les changements ou modifications non expressment approuvs par Ampt LLC pourraient annuler l'autorit de l'utilisateur utiliser l'quipement. Model: TKKR FCC ID: X3R-TKKR IC: 8399A-TKKR

Lmetteur/rcepteur exempt de licence contenu dans le prsent appareil est conforme aux CNR dInnovation, Sciences et Dveloppement conomique Canada applicables aux appareils radio exempts de licence. Lexploitation est autorise aux deux conditions suivantes:

1. Lappareil ne doit pas produire de brouillage. 2. Lappareil doit accepter tout brouillage radiolectrique subi, mme si le brouillage est susceptible den compromettre le fonctionnement. Copyright 2020 Ampt, LLC. All rights reserved. PRELIMINARY 30 String Optimizer V1500-30 Series Installation Manual: 57070016-1 v20201023 Reference: Electrical Connection Order After the installer has read the manual, this page can be used as a reference on the job site to ensure the electrical connection order and to avoid damage to the device. Input 1 from PV Ensure that there are no parallel connections to the string while series connections are being made. Input 2 These instructions are for reference only and do not replace the installation manual. See the manual for complete instructions and safety messages. WARNING Read the warning statements below:

Installation and maintenance should be performed only by qualified persons. Installers and maintenance personnel assume the risk of all injury that might occur during installation or maintenance including, without limitation, the risk of electric shock. Follow your safety procedures and protocols. Do not make or break connections under load. Voltage may be present on the output terminals when an input terminal is connected. Voltage builds as modules are connected in series. Do not put stress on the optimizer connectors at any time. The cable management method must prevent tension on each connector and movement of the connecting wires at all times. Tracker installations must avoid tension on the connectors throughout its rotation. NOTICE Failure to follow these instructions will void warranty. Failure to follow the prescribed connection order can result in damage to the device. from PV Output to Inverter/PCS Note: Disconnect in reverse order. Output, Input 2, Input 1 Copyright 2020 Ampt, LLC. All rights reserved. PRELIMINARY 32 String Optimizer V1500-30 Series Installation Manual: 57070016-1 v20201023 Mechanical Installation Best Practices Store optimizers in a sheltered location that is protected from weather exposure. Optimizers damaged by water due to improper storage are not covered under warranty. Ground according to local codes using the grounding stud or a listed bonding washer. Ensure that optimizers are oriented with connectors facing down unless otherwise specified by Ampt. Keep optimizer in a covered location and free from pooling water. If possible, keep the top side of optimizer free from obstructions to maximize the radio signal. Leave connector caps in place until they are ready to be connected to protect the optimizer from water and debris ingress. Leave space between mounted optimizers to allow for air circulation and cooling. Make sure there is enough slack on the input and output wires to ensure that they do not cause strain on the optimizer bulkhead connectors. If installed on a tracker system, keep wires free from abrasion and leave enough slack in the wires to account for tracker movement. DO NOT Store optimizers outdoors without protection from weather and water ingress. o o Transport optimizers that are removed from packaging. o Mount optimizers with connectors facing upwards. o Mount optimizers directly to a solar module frame. o Drill into optimizer frame to expand mounting holes. Electrical Commissioning Best Practices Be sure to only use Stubli connectors on input and output wires that are connected to optimizer. Only use Stubli crimping tool and disconnect tool on cabling and connectors. Ensure there are no ground faults on input strings. Test voltage and polarity of input strings and optimizer output. If an optimizer input will have two or more PV strings in parallel, make these connections before connecting the optimizer input. Connect in the following order: Input 1, Input 2, Output. Always use a current clamp to ensure there is no current present before disconnecting outputs/inputs. If disconnecting unit: disconnect Output first, then Input 2, then Input 1. Configure inverter settings appropriately according to the project design. DO NOT o Connect output of optimizer before connecting inputs. o Disconnect under load. o Disconnect optimizer connectors without checking for current first. o Disconnect optimizer inputs before output. o Operate optimizer with only one input. o Use improper disconnecting tools on the connectors. Ampt Support Contacts Global support@ampt.com North America

+1 970.372.6951 Europe

+49 7456 20 88 42 Japan

+81.45.565.9977 Copyright 2020 Ampt, LLC. All rights reserved. PRELIMINARY 33 String Optimizer V1500-30 Series Installation Manual: 57070016-1 v20201023 Copyright 2020 Ampt, LLC. All rights reserved. PRELIMINARY 34 String Optimizer V1500-30 Series Installation Manual: 57070016-1 v20201023

LABEL, FCC - TKKR Optimizers

(Ampt p/n: 43000071-1 A) 2.0 Model: TKKR FCC ID: X3R-TKKR IC: 8399A-TKKR 5 7

. 0 This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions:

(1) this device may not cause harmful interference, and

(2) this device must accept any interference received, including interference that may cause undesired operation. Manufactured by Ampt, LLC DIE LINE DOES NOT PRINT

ampt energy realized November 16, 2020 Attention: Application Examiner RE Request for Confidentiality Applicant: Ampt, LLC FCC ID: X3R-TKKR To Whom It May Concern:

Permanent Confidentiality Request is hereby submitted by Ampt, LLC to withhold permanently from public review certain portions of the application for equipment certification for the referenced FCC identifiers. This request for confidentiality is made pursuant to 47 CFR 0.457(d) and 0.459 of the FCC Rules. In particular, the following sections of the application are to be kept permanently confidential:

Schematics Detailed Block Diagrams Detailed Operational/Functional Description Short-term Confidentiality Request is hereby submitted by Ampt, LLC to withhold from public review for a period of 180 days from the date of the Grant of Equipment Authorization and prior to marketing, certain portions of the application for equipment certification for the referenced FCC identifiers. This request for confidentiality is made pursuant to 47 CFR 0.457(d) and 0.459 of the FCC Rules. In particular, the following sections of the application are to be kept confidential for a period of 180 days from the date of Authorization:

Test setup photos External photos Internal photos ORY wm estcbelercy Long term Confidentiality Request is hereby submitted by Ampt, LLC to withhold internal photos from public review as the circuit board and internal components are not accessible by users and is enclosed in potting compound. This request for confidentiality is made pursuant to 47 CFR 0.457(d) and 0.459 of the FCC Rules. Ampt LLC, 4850 Innovation Drive, Fort Collins, CO 80525 p: 970.372.6950 f: 970.225.0483 www.ampt.com Rationale for request for confidentiality:

Ampt, LLC has invested considerable time and materials in research and development to produce the referenced product. Disclosure of the permanently confidential portions of this application to competitors would not only give them significant competitive advantages in developing similar products, but would also disclose successful implementation of unpublished, leading edge technology developed by us. If you have questions or need further information, please contact the undersigned. Nye Robin Richardson Director of Hardware Engineering Ampt, LLC Ampt LLC, 4850 Innovation Drive, Fort Collins, CO 80525 p: 970.372.6950 f: 970.225.0483 www.ampt.com

ampt energy realized ovember 16, 2020 Federal Communications Commission 445 12th Street SW Washington, DC 20554 Subject: . Limited Agency Agreement Ampt, LLC FCC ID: X3R-TKKR To Whom It May Concern We, Ampt, LLC, hereby authorized Intertek Testing Services to act as our Agent for the purpose of preparing application for FCC ID number X3R-TKKR under all applicable parts of the FCC rules and regulations. The effective date of this limited agency agreement is November 16, 2020. The Limited Agency Agreement expires on March 31, 2021, unless sooner terminated or extended by written notice to Intertek Testing Services and the Federal Communications Commission. This is to advise that we are in full compliance with the Anti-Drug Abuse Act. The applicant is not subject to a denial of federal benefits pursuant to Section 5301 of the Anti-Drug Act of 1988, 21 U.S.C. 862, and no party to the application is subject to a denial of federal benefits pursuant to that section. If you have any questions or comments, please do not hesitate to contact me. Sincerel Robin Richardson Ampt, LLC Director of Hardware Engineering Ampt LLC, 4850 Innovation Drive, Fort Collins, CO 80525 p: 970.372.6950 f: 970.225.0483 www.ampt.com