KEHUA TECH SPI-B Series User Manual
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KEHUA TECH SPI-B Series User Manual

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String PV Grid-tied Inverter
SPI-B Series (100K-125K)
User Manual

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  • Page 1 String PV Grid-tied Inverter SPI-B Series (100K-125K) User Manual...
  • Page 3 Copyright © KehuaHengshengCo.,Ltd.2020.All rights reserved. No part of this document may be reproduced or transmitted in any form or by any means without prior written consent of Kehua Hengsheng Co., Ltd. Trademarks and Permissions and other Kehua trademarks are trademarks of Kehua Hengsheng Co., Ltd. All other trademarks and trade names mentioned in this document are the property of their respective holders.
  • Page 4 User Manual Foreword Summaries Thank you for choosing the SPI-B series (100K-125K) string PV grid-tied inverter (Hereinafter referred to as inverter)! This document gives a description of the inverter, including appearance, features, working principles, installation, electrical connection, operation, maintenance and storage, etc.
  • Page 5 String PV Grid-tied Inverter SPI-B Series (100K-125K) User Manual Foreword Symbol Description Anti-static prompting. Be care electric shock prompting. Provides a tip that may help you solve a problem or save time. Provides additional information to emphasize or supplement important points in the main text.

  • Page 6: Table Of Contents

    String PV Grid-tied Inverter SPI-B Series (100K-125K) Contents User Manual Contents 1 Safety Description......................... 1 1.1 Safety Announcements ............................. 1 1.1.1 Use Announcements ..........................1 1.1.2 PV String Protection ..........................3 1.1.3 ESD Protection ............................3 1.1.4 Grounding Requirements ........................3 1.1.5 Moistureproof Protection ........................
  • Page 7 String PV Grid-tied Inverter SPI-B Series (100K-125K) User Manual Contents 2.4.3 WIFI/GPRS Communication (Optional) ....................13 2.4.4 PLC Communication (Optional) ......................14 2.4.5 PID Function (Optional) ........................16 3 Installation............................ 18 3.1 Installation Process ............................18 3.2 Installation Tools ............................18 3.3 Selection of Installation Site ..........................
  • Page 8 String PV Grid-tied Inverter SPI-B Series (100K-125K) Contents User Manual 4.3 Shut Down Inverter ............................53 5 Maintenance and Troubleshooting ..................54 5.1 Maintenance ..............................54 5.1.1 Maintenance Details and Period ......................54 5.1.2 Maintenance Guide ..........................55 5.2 Troubleshooting .............................. 58 6 Stop Running, Dismantle, Discard Inverter ................

  • Page 9: Safety Description

    String PV Grid-tied Inverter SPI-B Series (100K-125K) User Manual 1 Safety Description 1 Safety Description This chapter mainly describes the safety announcements. Prior to performing any work on the device, please read the user manual carefully, follow the operation and installation instructions and observe all danger, warning and safety information.
  • Page 10 String PV Grid-tied Inverter SPI-B Series (100K-125K) 1 Safety Description User Manual There is no operational part inside the inverter. Please do not open the crust of the inverter by yourself, or it may cause electric shock. The device damage caused by illegal operation is out of the guarantee range.

  • Page 11: Pv String Protection

    String PV Grid-tied Inverter SPI-B Series (100K-125K) User Manual 1 Safety Description 1.1.2 PV String Protection When install PV string in daytime, it necessary to cover the PV string by light-proof material, or the PV string will generate high voltage under sunshine. If touching PV string accidently, it may cause...

  • Page 12: Moistureproof Protection

    String PV Grid-tied Inverter SPI-B Series (100K-125K) 1 Safety Description User Manual 1.1.5 Moistureproof Protection Moisture invasion may cause inverter damage! Observe the following items to ensure the inverter works normally.  When the air humidity is more than 95%, don't open the door of the inverter;...

  • Page 13: Measurement Under Operation

    String PV Grid-tied Inverter SPI-B Series (100K-125K) User Manual 1 Safety Description 1.1.8 Measurement Under Operation There exists high voltage in the device. If touching device accidently, it may cause electric shock. So, when perform measurement under operation, it must take protection measure(such as wear insulated gloves, etc.)

  • Page 14: Overview

    String PV Grid-tied Inverter SPI-B Series (100K-125K) 2 Overview User Manual 2 Overview This chapter mainly describes product appearance, structure, working principle and communication method, etc. 2.1 Product Intro The inverter converts the DC energy from PV string into AC energy and then feedbacks to power grid, which is suitable for the large power station grid-tied system.

  • Page 15: Features

    String PV Grid-tied Inverter SPI-B Series (100K-125K) User Manual 2 Overview Transformer Inverter Figure2-2 Grid form 2.1.1 Features  Innovated three level design, with high transition efficiency.  Support PLC communication, night SVG function, which satisfies the requirement of grid scheduling.

  • Page 17: Bottom Layout

    String PV Grid-tied Inverter SPI-B Series (100K-125K) User Manual 2 Overview Mark Color Meaning Status illustration OFF: All PV strings are disconnected. ON: Grid-tied status. Flicker: Inverter stay in decrease rated power ○ Green Grid indicator output status. OFF: No grid-tied status.
  • Page 18 String PV Grid-tied Inverter SPI-B Series (100K-125K) 2 Overview User Manual Table2-2 Mark description Mark Name Remarks string input ○ MPPT n +/MPPT n - Used to connect PV string input. terminal It is the connection switch between inverter and PV string. Each DC switch ○...

  • Page 19: Size

    String PV Grid-tied Inverter SPI-B Series (100K-125K) User Manual 2 Overview 2.2.4 Size Figure2-7 Size (unit: mm) 2.3 Working Principle The PV string input is connected to the inverter, and the maximum power point for the PV string is tracked through the internal 12 groups of MPPT circuits to achieve the maximum power output of the PV string, and then the conversion of DC power to three-phase AC power is realized through the inverter circuit, as shown in Figure2-8.

  • Page 20: Rs485 Communication

    String PV Grid-tied Inverter SPI-B Series (100K-125K) 2 Overview User Manual Figure2-9 Ethernet communication interface diagram …… Inverter Inverter Inverter Router Monitoring platform Figure2-10 Ethernet monitoring (multiple inverters) 2.4.2 RS485 Communication RS485 communication (the interface is shown in Figure2-11) is mainly used for local area network monitoring, which can realize the background remote monitoring.

  • Page 21: Wifi/Gprs Communication (Optional)

    String PV Grid-tied Inverter SPI-B Series (100K-125K) User Manual 2 Overview Figure2-11 RS485communication interface diagram …… Inverter 1 Inverter 2 Inverter N Monitoring N≤20 platform Figure2-12 RS485 communication (multiple inverters) When there is only one inverter communicates via RS485, choose one of the two communication interfaces to connect.

  • Page 22: Plc Communication (Optional)

    String PV Grid-tied Inverter SPI-B Series (100K-125K) 2 Overview User Manual Smart phone Inverter （include GPRS） Internet Router Inverter （include WIFI） Computer monitor Figure2-13 WIFI/GPRS monitoring solution The APP can build communication between WIFI or GPRS wireless communication module and inverter.
  • Page 23 String PV Grid-tied Inverter SPI-B Series (100K-125K) User Manual 2 Overview Isolation Inverter 1 Grid transformer Sub-array Inverter 2 RS485 controller Inverter N Figure2-15 PLC communication connection The setting of PLC communication address is the same as that of RS485, details please see 3.6.8 COM.

  • Page 24: Pid Function (Optional)

    String PV Grid-tied Inverter SPI-B Series (100K-125K) 2 Overview User Manual Monitor platform Data collector Data Data collector collector Data collector Smart Data sub-array collector controller Environment Box-type Inverter monitoring transformer instrument Figure2-16 Network application scheme of smart sub-array controller 2.4.5 PID Function (Optional)
  • Page 25 String PV Grid-tied Inverter SPI-B Series (100K-125K) User Manual 2 Overview PID repair function When the inverter not running, the PID function module add reverse voltage for PV string to repair the PV string which has occurred the PID effect.

  • Page 26: Installation

    String PV Grid-tied Inverter SPI-B Series (100K-125K) 3 Installation User Manual 3 Installation This chapter mainly introduces the inverter's installation, including installation process, installation preparation, handling, unpacking and checking, installation procedures, electrical connection. check the installation, etc. 3.1 Installation Process The installation process of the inverter is as shown in Figure3-1.
  • Page 27 String PV Grid-tied Inverter SPI-B Series (100K-125K) User Manual 3 Installation Tools Ltd. All rights reserved ©Kehua Hengsheng Co.,...

  • Page 28: Selection Of Installation Site

    String PV Grid-tied Inverter SPI-B Series (100K-125K) 3 Installation User Manual Tools The installation tools need to be insulated to avoid electric shock. Multimeter range≥1100V. Wrench specification: T30. 3.3 Selection of Installation Site 3.3.1 Installation Environment The use environment has a certain influence on the service life and reliability of the inverter.

  • Page 29: Installation Clearance

    String PV Grid-tied Inverter SPI-B Series (100K-125K) User Manual 3 Installation Figure3-2 Installation environment requirements  As the operation of inverter will produce noise pollution, avoid installing them near residential areas as far as possible. Choose the best installation location for the inverter, which plays a very important role in its safe operation, service life, performance guarantee, etc.
  • Page 30 String PV Grid-tied Inverter SPI-B Series (100K-125K) 3 Installation User Manual Figure3-4 Installation clearance The installation height of the inverter should be easy to check the status of the indicator lights, connect wires, operate and maintain, etc. The recommended space between bottom inverter and ground is 600~800mm.

  • Page 31: Requirements For Installation Carrier

    String PV Grid-tied Inverter SPI-B Series (100K-125K) User Manual 3 Installation Figure3-6 Back-to-back installation space requirements (unit: mm) 3.3.3 Requirements for Installation Carrier The installation carrier of the inverter (such as walls and brackets) should meet the requirements shown in Figure3-7.

  • Page 32: Transporting, Unpacking And Checking

    String PV Grid-tied Inverter SPI-B Series (100K-125K) 3 Installation User Manual Figure3-8 Illustration of installation method Because the inverter is downward air inlet and the upper air outlet, in order to ensure the normal operation of the inverter, it is not recommended to install it horizontally.
  • Page 33 String PV Grid-tied Inverter SPI-B Series (100K-125K) User Manual 3 Installation The handle is an accessory. When transporting, they need to be installed to corresponding position and tightened. It is recommended that carry the inverter by at least 4 people and wear protective equipment such as smash-proof shoes and gloves.

  • Page 34: Unpacking And Checking

    String PV Grid-tied Inverter SPI-B Series (100K-125K) 3 Installation User Manual While hoisting, keep balance and avoid collision with walls or other objects. In case of severe weather conditions, such as heavy rain, heavy fog, strong wind, etc., the hoisting operation should be stopped.
  • Page 35 String PV Grid-tied Inverter SPI-B Series (100K-125K) User Manual 3 Installation Figure3-11 Assemble installation holder Step 2 Place the assembled installation holder onto the installation site, use a horizontal ruler to adjust the angle, and mark the position of the hole on the bracket, as shown in Figure3-12.
  • Page 36 String PV Grid-tied Inverter SPI-B Series (100K-125K) 3 Installation User Manual Figure3-13 Mounting hole size (unit: mm) Step 3 Use the electric drill to drill holes on the bracket according to the marked position. The drilling size is Φ12mm, as shown in Figure3-14.
  • Page 37 String PV Grid-tied Inverter SPI-B Series (100K-125K) User Manual 3 Installation Step 5 Lift the inverter to the installation holder, make sure that the mounting ears of the inverter and the groove of the installation holder fit well, and then slowly hang the inverter to the installation holder, as shown in Figure3-16.

  • Page 38: Wall Mounting

    String PV Grid-tied Inverter SPI-B Series (100K-125K) 3 Installation User Manual ----End 3.5.2 Wall Mounting Step 1 Use the four M4*10 combination bolts in accessories to fix the installation holder with the joint lever, as shown in Figure3-18. Figure3-18 Assemble installation holder...
  • Page 39 String PV Grid-tied Inverter SPI-B Series (100K-125K) User Manual 3 Installation You can also directly mark the location of the holes according to the size of the mounting holes (see Figure3-20). Figure3-20 Mounting hole size(unit: mm) Step 3 According to the marked position, use a hammer drill to drill holes on the wall. Drilling hole size is Φ14.5mm, depth range is 55~60mm.
  • Page 40 String PV Grid-tied Inverter SPI-B Series (100K-125K) 3 Installation User Manual Figure3-22 Expansion bolt installation diagram Step 5 Install the installation holder. Fix the installation holder to the expansion bolts, put on flat washers, spring washers and nuts, and then tighten the nuts clockwise with a wrench, as shown in Figure3-23.
  • Page 41 String PV Grid-tied Inverter SPI-B Series (100K-125K) User Manual 3 Installation Figure3-24 Hang the inverter onto the installation holder After confirming that the inverter is fixed firmly, the operator can release the equipment. Step 7 Use the screws M5*50 in the accessories to fix the inverter, as shown in Figure3-25.

  • Page 42: Electrical Connection

    String PV Grid-tied Inverter SPI-B Series (100K-125K) 3 Installation User Manual 3.6 Electrical Connection 3.6.1 Safety Announcements During operating, professionals must wear protective equipment.  High voltage may exist in the inverter.  PV string exposed to sunlight will generate dangerous voltage.

  • Page 43: External Grounding Connection

    String PV Grid-tied Inverter SPI-B Series (100K-125K) User Manual 3 Installation Table3-1 Wire and terminal requirements Name Type Recommended wire diameter（mm ） 1100V and above PV PV string input wire cables Outdoor three-core/four-core cable: 70~240 (Max. Outdoor multi-core outer diameter<56mm);...
  • Page 44 String PV Grid-tied Inverter SPI-B Series (100K-125K) 3 Installation User Manual  Since the inverter is with no transformer, it is required that the positive and negative poles of the PV string cannot be grounded, otherwise the inverter will not operate normally.

  • Page 45: Ac Output Wiring

    String PV Grid-tied Inverter SPI-B Series (100K-125K) User Manual 3 Installation Two external grounding terminals are reserved at the bottom of the inverter, at least one of them should be connected. In order to improve the anti-corrosion performance of the grounding terminal, it is recommended to paint anti-rust paint on the outside of the grounding terminal for protection after installation.
  • Page 46 String PV Grid-tied Inverter SPI-B Series (100K-125K) 3 Installation User Manual If several inverters need to share a breaker, the breaker needs to be selected according to the total current. No load can be connected between the inverter and the breaker.
  • Page 47 String PV Grid-tied Inverter SPI-B Series (100K-125K) User Manual 3 Installation Figure3-30 Open the wiring cover A limiting lever is designed inside the wiring box. After the wiring cover is opened, the limiting lever needs to be fixed (as shown in Figure Figure3-31) to facilitate the wiring operation.
  • Page 48 String PV Grid-tied Inverter SPI-B Series (100K-125K) 3 Installation User Manual Figure3-32 Connect the AC output cable The torque used to tighten the external forced cable fixing head of AC wiring is about 15~19N· m. In order to avoid excessive stress on the cable, the AC cable needs to enter the inverter vertically, and the external length of the straight section should be not less than 200mm, as shown in Figure3-33.

  • Page 49: Internal Grounding Connection

    String PV Grid-tied Inverter SPI-B Series (100K-125K) User Manual 3 Installation Figure3-33 AC cable entry requirements (unit: mm)  When leaving the factory, outlet end of the cable seal ring is in a sealed status. Before connecting, puncture it by tool.

  • Page 50: Pv String Input Wiring

    String PV Grid-tied Inverter SPI-B Series (100K-125K) 3 Installation User Manual Figure3-34 Connect internal grounding cable The torque used to tighten the externally forced cable fixing head of the inner grounding wire is about 10~13N· m. 3.6.6 PV String Input Wiring Pay attention to safety before electrical connection, the PV string will produce dangerous voltage when exposed to sunlight.
  • Page 51 String PV Grid-tied Inverter SPI-B Series (100K-125K) User Manual 3 Installation If the DC input wires are reverse connected by accident and the "DC SWITCH" have been set to the "ON", do not immediately operate the "DC SWITCH" and the positive and negative connectors, or, it may cause inverter damage.
  • Page 52 String PV Grid-tied Inverter SPI-B Series (100K-125K) 3 Installation User Manual Figure3-35 Schematic diagram of stripping DC input wiring (Unit: mm) It is recommended to use red for positive cables and black for negative cables to avoid wiring errors. If other colors are used, please confirm the corresponding relationship when crimping each cable to the connector.
  • Page 53 String PV Grid-tied Inverter SPI-B Series (100K-125K) User Manual 3 Installation ----End Wiring illustration for type-Y PV connector When wiring by type-Y PV connector, the type of all connectors must match that of the inverter. If using the connector with different manufacturer or different type together, the contact resistance of the connector may exceed the allowable value, it will continue to heat and oxidize and easy to break down.
  • Page 54 String PV Grid-tied Inverter SPI-B Series (100K-125K) 3 Installation User Manual Figure3-40 Wiring diagram (connected from PV string) Install PV connectors ○ Step 1 Confirm that all DC switches on the inverter (shown as 2 in Figure3-41) are OFF. Figure3-41 Diagram of DC switch OFF status...

  • Page 55: Wifi/Gprs Communication Connection (Optional)

    String PV Grid-tied Inverter SPI-B Series (100K-125K) User Manual 3 Installation Step 3 Insert the positive and negative connectors into the MPPT "+" and "-" terminals on the bottom of the inverter respectively (as shown in Figure3-43). When you hear a click, it means the connection is completed.

  • Page 56: Com. Communication Connection

    String PV Grid-tied Inverter SPI-B Series (100K-125K) 3 Installation User Manual When connecting, pay attention to the limiting position, and don't wrongly insert it. When tightening, do not use excessive force (torque: 1.5~2.0N•m), so as not to damage the interface.
  • Page 57 String PV Grid-tied Inverter SPI-B Series (100K-125K) User Manual 3 Installation Figure3-46 Ethernet communication connection  RS485 communication connection Connect the RS485 communication wires to the RS485 port on the communication board, as shown in Figure3-47, and connect the other end to the monitoring platform.
  • Page 58 String PV Grid-tied Inverter SPI-B Series (100K-125K) 3 Installation User Manual  When connecting, do not press the insulation layer of the communication cable into terminal, otherwise it may cause poor contact.  The RS485 communication wire must be routed separately from the input and output wires to avoid interference with communication.

  • Page 59: Check The Installation

    String PV Grid-tied Inverter SPI-B Series (100K-125K) User Manual 3 Installation Figure3-49 Position of SW3 The communication address of the inverter must not conflict. Step 3 After connecting, tighten the external forced cable fixing head, seal with fireproof mud and install the cover plate.

  • Page 60: Startup And Shutdown

    String PV Grid-tied Inverter SPI-B Series (100K-125K) 4 Startup and Shutdown User Manual 4 Startup and Shutdown This chapter mainly introduces how to start and shut down the inverter. 4.1 Check Before Startup Before first startup, please check the following items first.

  • Page 61: Shut Down Inverter

    String PV Grid-tied Inverter SPI-B Series (100K-125K) User Manual 4 Startup and Shutdown Step 1 Switch on the DC switches on the inverter and the project site. When the PV string provides enough startup voltage, PV string indicator will be on.

  • Page 62: Maintenance And Troubleshooting

    String PV Grid-tied Inverter SPI-B Series (100K-125K) 5 Maintenance and Troubleshooting User Manual 5 Maintenance and Troubleshooting This chapter mainly describes the maintenance and troubleshooting. 5.1 Maintenance If any maintenance service is needed, please contact the after-sale service centre of Kehua Company, otherwise, Kehua Company will not undertake the responsibility and guarantee for the loss caused by self-operation.

  • Page 63: Maintenance Guide

    String PV Grid-tied Inverter SPI-B Series (100K-125K) User Manual 5 Maintenance and Troubleshooting Item Check method Maintenance period maintain it in time. Wire Inlet Check if the wire inlet holes are sealed up Every year hole completely, if not, seal them with fireproof mud.
  • Page 64 String PV Grid-tied Inverter SPI-B Series (100K-125K) 5 Maintenance and Troubleshooting User Manual and keep them unblocked. If necessary, a soft brush can be used to clean the wind inlet & outlet holes. Fan maintenance Before maintenance, shut down the inverter and disconnect all power input.
  • Page 65 String PV Grid-tied Inverter SPI-B Series (100K-125K) User Manual 5 Maintenance and Troubleshooting Figure5-2 loosen the wiring of fan module Step 4 Pull out the fan module, clean the fan by brush or cleaner or replace damaged fan. Figure5-3 Pull out fan module Step 5 Install the fan module in reversed order and lock the screws, restart the inverter.

  • Page 66: Troubleshooting

    String PV Grid-tied Inverter SPI-B Series (100K-125K) 5 Maintenance and Troubleshooting User Manual 5.2 Troubleshooting The inverter is designed on the basis of the grid-tied operation standards and meets the requirements of safety and EMC. Before provided to client, the inverter has been experienced for several rigorous tests to ensure reliable and optimizing operation.
  • Page 67 String PV Grid-tied Inverter SPI-B Series (100K-125K) User Manual 5 Maintenance and Troubleshooting Fault information Solution Check the insulation resistance of the positive and negative poles of Insulation the battery board to the ground; check whether the environment impedance around the inverter is wet; check whether the grounding point inside abnormal the inverter is loose.
  • Page 68 String PV Grid-tied Inverter SPI-B Series (100K-125K) 5 Maintenance and Troubleshooting User Manual If the inverter has an alarm mentioned in Table5-2, please shut down inverter (refer to 4.3 Shut Down Inverter), 5 minutes later, restart the inverter (refer to 4.2 Start Inverter). If the alarm status is not removed, please contact our local agency or service center.

  • Page 69: Stop Running, Dismantle, Discard Inverter

    String PV Grid-tied Inverter SPI-B Series (100K-125K) User Manual 6 Stop Running, Dismantle, Discard Inverter 6 Stop Running, Dismantle, Discard Inverter This chapter introduces the dispose way for stop running, dismantling, discarding the inverter. 6.1 Stop Running Normally, the inverter don't need to be shut down, but when maintenance, it is necessary to shut down the inverter.

  • Page 70: Dismantle The Inverter

    String PV Grid-tied Inverter SPI-B Series (100K-125K) 6 Stop Running, Dismantle, Discard Inverter User Manual 6.2 Dismantle the Inverter After the connection among inverter and grid and PV string is completely disconnected and wait for 30min at least, ensure that the inner capacitor discharge completely, and then the inverter can be dismantled.

  • Page 71: Package, Transportation, Storage

    String PV Grid-tied Inverter SPI-B Series (100K-125K) User Manual 7 Package, Transportation, Storage 7 Package, Transportation, Storage This chapter mainly describes the package, transportation and storage. 7.1 Package The package of product is carton. When packing, pay attention to the placing direction requirements.

  • Page 72: A Technical Specifications

    String PV Grid-tied Inverter SPI-B Series (100K-125K) A Technical Specifications User Manual Technical Specifications A.1 SPI100K-B Items Min. Typical Max. Illustration Max. PV input voltage (Vd.c.) 1000 MPPT working voltage with full load (Vd.c.) 18/9 (10~12MPPT optional) PV connected/ MPPT tracking DC current of each route (Ad.c.)
  • Page 73 String PV Grid-tied Inverter SPI-B Series (100K-125K) User Manual A Technical Specifications Items Min. Typical Max. Illustration Max. inverter backfeed current to the array (Ad.c.) Max. output over-current protection (Aa.c.) Maximum output fault current (Aa.c.) Current (inrush) (Aa.c.) 6.97 Grid-tied inverting efficiency 99.0%...
  • Page 74 String PV Grid-tied Inverter SPI-B Series (100K-125K) A Technical Specifications User Manual Items Min. Typical Max. Illustration Operation temperature (℃) Storage temperature (℃) Relative humidity 100% Atmosphere (kPa) When altitude exceeds 4000 Altitude (m) 3000m, it is necessary to decrease rated power to use.
  • Page 75 String PV Grid-tied Inverter SPI-B Series (100K-125K) User Manual A Technical Specifications Items Min. Typical Max. Illustration Grid features Output power (kW) 137.5 Rated grid voltage (Va.c.) 400V(3P3W) Settable (If it is necessary to Grid voltage range (Va.c.) parameter, please contact the manufacturer.)
  • Page 76 String PV Grid-tied Inverter SPI-B Series (100K-125K) A Technical Specifications User Manual Items Min. Typical Max. Illustration ground, grounding output must be with isolation transformer. Heat dissipation way Smart wind-cooling <75±2dBA@1m Noise Display way LED indicator Communication port RS485/Ethernet/WIFI(optional)/GPRS (optional)/PLC(optional) Operation temperature (℃)

  • Page 77: B Quality Assurance

    String PV Grid-tied Inverter SPI-B Series (100K-125K) User Manual B Quality Assurance Quality Assurance If the device fault in guarantee period, Kehua Hengsheng Co., Ltd. (hereinafter referred to as Kehua Company) will maintenance it free or replace new product. Evidence In guarantee period, user needs to show the purchase invoice of the product, and the trademark on the product must be clearly visible, or, Kehua Company have right to refuse the quality assurance.
  • Page 78 String PV Grid-tied Inverter SPI-B Series (100K-125K) B Quality Assurance User Manual  Damage caused by abnormal nature environment. If the fault is caused by above situation and user requires to maintain it, we can provide paid maintenance service after our service organization decided.

  • Page 79: C Acronyms And Abbreviations

    String PV Grid-tied Inverter SPI-B Series (100K-125K) User Manual C Acronyms and Abbreviations Acronyms and Abbreviations Alternating Current Direct Current Liquid Crystal Display Light-emitting Diode MPPT Maximum Power Point Tracking Protective Earthing Photovoltaic Ltd. All rights reserved ©Kehua Hengsheng Co.,...
  • Page 80 String PV Grid-tied Inverter SPI-B Series (100K-125K) C Acronyms and Abbreviations User Manual RS485 Recommend Standard485 Ltd. All rights reserved ©Kehua Hengsheng Co.,...

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