LONGi LR5-54HPH Solar PV Modules Instruction Manual

LONGi LR5-54HPH Solar PV Modules

Product Information

Specifications

• Applicable Module Types: Mono-facial Module, Bifacial Module
• Module Structure: Single Glass, Double Glass
• Status: IECUL

Product Usage Instructions

Introduction

• Ensure compliance with national laws, local regulations, and industry standards during installation.

Installation Conditions

• Consider the installation site, working environment, and selection of tilt angles.

Mechanical Installation

• Regular Requirements: Follow guidelines for module mechanical installation.
• Bolts Mounting: Secure modules using bolts.
• Clamp Mounting: Use clamps for installation where necessary.

Electrical Installation

• Electrical Performance: Ensure proper electrical performance.
• Cables and Wiring: Use appropriate cables and wiring methods.
• Connector: Install connectors correctly.
• Bypass Diode: Implement bypass diode as needed.

Grounding

• Properly ground the PV modules for safety and performance.
• Operation and Maintenance
• Cleaning: Regularly clean the modules.
• Module Appearance Inspection: Inspect the modules visually.
• Inspection of Connectors and Cables: Check connectors and cables periodically.

Frequently Asked Questions (FAQ)

Q: What are the applicable module types for this installation manual?

• A: The applicable module types are the monofacial module and the Bifacial Module.

Q: How should I ensure the electrical performance of the modules during installation?

• A: To ensure proper electrical performance, follow the guidelines provided in the electrical installation section of the manual and use appropriate cables, connectors, and bypass diodes.

Applicable Module Type

• The identifier behind the module model indicates that the height of the module frame is 30mm.
• LR4-xxx-xxxM module and LR5-xxxHIH/HIB/HIBB/HIBD-xxxM module installation load and certification information are shown in the V16 version of the LONGi PV Module Installation Manual.

Safety Note

• This manual elaborates on installation and safety use information for PV power generation modules (hereinafter referred to as module) of LONGi Solar Technology Co., Ltd. (hereinafter referred to as LONGi). Please abide by all safety precautions in this guide and local regulations.
• Installation of modules requires professional skills and knowledge and is to be carried out by qualified personnel. Please read this manual carefully before installing and using this module. Installation personnel shall get familiar with the mechanical and electrical requirements of this system. Please keep this manual readily available as a reference for future maintenance or upkeep or sales and testing or handing of modules.
• If you have any doubts, please contact LONGi customer service personnel for further interpretation.

Introduction

• Electrical and mechanical installation information will be introduced in this installation manual, so please read and understand the information before installing LONGi modules. In addition, this manual also contains important safety information that you should be familiar with. All contents in this manual are intellectual properties of LONGi which originates from long-term of technical exploration and experience accumulation of LONGi.
• This installation manual does not entail any explicit or implicit quality warranty and does not stipulate compensation schemes for losses, module damages, or other costs caused by or related to module installation, operation, utilization, and maintenance process. When there is a dispute between the parties about the root -cause of module damage, the IEC 61215-2:2016 static mechanical load test item and the approved maximum static test load should be applied to determine the module quality. LONGi is liable for the losses or expenses incurred only when the module failed the above tests.
• LONGi will not take any responsibility if patent rights or third-party rights are infringed by the use of modules. LONGi reserves the right to modify the product manual or installation manual without advanced notice. It is recommended to visit our website regularly at www.longi.com for the latest version of this installation manual.
• If customers fail to install modules as per the requirements outlined in this manual, the limited warranty provided for customers will be invalid. In addition, suggestions in this manual are to improve the safety of module installation, which are tested and proved through years of experience. Please provide this manual to PV system users for reference and inform them of advice on operation, maintenance requirements, etc.

Laws and Regulation

The mechanical and electrical installation of photovoltaic modules should comply with national laws, local regulations, and industry standards, including the requirements of the Safety Production Law, Environmental Protection Law, national standards, and electricity specifications, to ensure the human safety of people and the photovoltaic module system.
The specific implementation standards are mainly based on the requirements of the authority where the project is located.

General Information

Modules identification

Three labels on the module contain the information below

1. Nameplate: product type, rated power, rated current, rated voltage, open circuit voltage, short circuit current under testing conditions, certification indicator, maximum system voltage, etc.
2. Current classification label: Rated working current. (H indicates High, M indicates Medium, and L indicates Low).
3. Serial Number label: A unique serial number that is laminated inside the module permanently and can be found in the front of the module. There is another serial number beside the module nameplate.

Figure 1 Typical Mechanical Drawing of Mono-facial Modules (Please refer to section 3.2 for the location of the junction box.
The specific version is subject to the corresponding specification.)

Figure 2 Typical Modules Mechanical Drawing

Please refer to section 3.2 for the location of the junction box. The specific version is subject to the corresponding specification.

Junction box style and wiring method

Junction Box Location

Recommended Wiring Method

Portrait Installation: Standard Cable length

• Note: The extra extended cable is required for connection at the turn-back corner of the wiring as shown below.
• Landscape Installation： 54/60 type PV module cable length ≥1.2m, 72 type PV module cable length ≥1.4m, 78 type PV module cable length ≥1.5m.
• Portrait installation: The adjacent modules in the same row need to be rotated 180 degrees for Leap-frog installation.
• 54/60 type PV module cable length ≥1.2m.
• 72 type PV module cable length ≥1.4m.
• 78 type PV module cable length ≥1.4m.

Figure 3 Bolt Installation of Mono-facial Modules

• The application level of the LONGi Solar module is Class Ⅱ, which can be used in systems operating at > 50 V DC or >240 W, where general contact access is anticipated;
• When the modules are for rooftop application, it is necessary to take the overall fire rating of the finished structure as well as operation and maintenance into account.
• The roofing PV system shall be installed after being evaluated by construction experts or engineers and with official analysis results for the entire structure. It shall be proved capable of supporting the extra weight of system racking structures and PV modules.
• For your safety, please do not work on the roof without required safety PPE(Personal Protective Equipment) which includes but is not limited to fall protection, ladder or stairs, and personal protective measures.
• For your safety, please do not install or handle modules in unsafe conditions including but not limited to strong wind or gust, damp or sandy roofs.
• PV modules can produce DC under sunlight. Any contact of exposed metal at the module’s wiring parts may result in electrical shock or burn. Any contact with 30V or larger DC Voltage can be fatal.
• In case of no connected load or external circuits, modules can still produce voltage. Please use insulation tools and wear rubber gloves when operating modules in the sunlight.
• No switch is on the PV modules. Operating PV modules can only be stopped when they are kept from sunlight or covered by hardboard or UV-proof materials.
• To avoid electric arc or electric shock hazards, please do not break down the electric connection in loaded conditions. Incorrect connections will also lead to an electric arc or shock. Keep connectors dry and clean and make sure that they are in good operating condition. Do not insert other metals into the connectors or carry out electric connections by whatever means. Snow, water, or other reflective mediums in surrounding environments that intensify light re-flection will increase output current and power. Module voltage and power will increase under low-temperature conditions.
• If module glass or other sealing materials are damaged, please wear PPE(personal protective equipment) and then isolate modules from the circuit.
• Do not operate when modules are wet unless you wear PPE(personal protective equipment). Please follow the cleaning requirements in this manual when cleaning modules.
• Do not contact connectors with the following chemicals: Gasoline, White Flower oil, woodlock oil, Mold temperature oil, Engine oil (such as KV46), Grease(such as Molykote EM-50L), Lubricating oil, Rust-proof oil, Stamping oil, Diesel, Cooking oil, Acetone, alcohol, essential balm, Bone-setting liquid, Banana oil, release agent(such as Pelicoat S-6), adhesive and potting materials capable of generating oxime gas(such as KE200、CX-200、chemlok), TBP, cleaning agent etc.
• Open modules outer package when installation.
• Do not damage the package and do not drop packaged modules on the ground.
• Do not exceed the indicated maximum layer limit on the packaging carton when piling modules up.
• Put the packaging carton in a ventilated, water-proof, and dry place before unpacking the modules.
• Follow unpacking instructions when opening the packaging carton.
• Carrying modules with the junction box or wires is strictly forbidden.
• Do not stand or walk on modules.
• To avoid glass damage, heavy objects are not allowed on modules.
• Be careful when placing modules at corners in particular.
• Do not try to dismantle the module or remove nameplates or parts of modules.
• Do not paint or apply any other adhesive on modules.
• Do not damage or scratch the back sheet of modules.
• Do not drill holes in the frame of a module, which may reduce frame loading capacity and lead to frame corrosion and invalidation of the limited warranty provided for customers.
• Do not scratch the anodic coating of the aluminum alloy frame except for the grounding connection. Scratch may lead to frame corrosion and reduce frame loading capacity and long-term reliability.
• Do not repair problematic modules on your own.
• Please refer to local laws and regulations before installing modules and abide by requirements on building fire protection.
• According to the corresponding certification standards, the fire rating of LONGi Mono-facial modules is UL Type 1 or 2 or IEC Class C and the fire rating of LONGi bifacial modules is UL Type 29 or IEC Class C.
• The roof should be coated by a layer of fireproof materials with a suitable fire protection rating for roofing installation and make sure that the back sheet and the mounting surface are fully ventilated.
• Different roof structures and installation modes will affect the fireproof performance of buildings. Improper installation may lead to the risk of fire.
• To guarantee a roof fire rating, the distance between the module frame and the roof surface must be ≥10cm. (0.39 inch)
• Adopt proper module accessories such as fuse, circuit breaker, and grounding connector according to local regulations. Please do not apply modules where exposed inflammable gases are nearby.

Installation Conditions

Installation Site and Working Environment

• The modules cannot be used in space.
• Do not manually focus sunlight with mirrors or magnifying glass onto modules.
• LONGi modules shall be installed on proper buildings or other appropriate places (such as ground, garage, building outer wall, roof, PV tracking system) but shall not be installed on any vehicles.
• Do not install modules at places that are possible to be flooded.
• LONGi suggests that modules be installed in the working environment with the temperature of -40℃ to 40℃ which is the monthly average highest and lowest temperature of the installation sites.
• The extreme working environment temperature for modules is -40℃ to 85℃.
• Make sure that installed modules do not suffer wind or snow pressure that exceeds the permissible maximum load limit.
• Modules shall be installed in places free from shadows throughout the year. Make sure there are no light-blocking obstacles in the installation sites.
• Carry out lightning protection for modules installed in places with frequent lightning and thunder.
• Do not install modules in places with possible inflammable gases.
• Modules cannot be used in environments with too much hail, snow, flue gas, air pollution, and soot or places with strong corrosive substances such as salt, salt mist, saline, active chemical steam, acid rain, or other substances corroding modules, affecting modules’ safety or performance.
• Please take protective measures to ensure reliable and safe installation of modules in severe environments such as heavy snow, cold and strong wind, or islands close to water and salt mist or deserts.
• LONGi modules passed the IEC 61701 salt spray corrosion test, but the corrosion may still occur where the module’s frame is connected to the bracket or where the grounding is connected. LONGi modules can be installed ≥50 m away from the ocean side.

Selection of Tilt Angles

• The tilt angle of PV modules refers to the included angle between the module surface and horizontal ground.
• The module will obtain the maximum power output when directly facing the sunlight.
• Modules are preferred to be south-facing in the north hemisphere and north-facing in the south hemisphere.
• Please refer to standard module installation guidelines or suggestions from experienced PV module installers, for the specific installation angle.
• LONGi suggests that the tilt angle of module installation be no less than 10°, so module surface dust can be washed away easily by rainfall and the frequency of cleaning can be reduced. It is easy for accumulated water to flow away physically and avoid water marks on the glass surface which may further affect module appearance and performance.
• LONGi modules connected in the string should be installed with the same orientation and tilt angle. Different module orientations and tilt angles may result in different levels of solar irradiation and also power generation. In order to achieve the maximum annual generating capacity, the optimal orientation and inclination of PV modules in the installed area should be selected to ensure that sunlight can still reach to modules even on the shortest day of the year.
• If LONGi modules are used in an off-grid System, the tilt angle should be calculated based on seasons and irradiation to maximize the output power. If the module’s output power meets the acquired load under the period of the worst irradiation in the year, the modules should be able to meet the load of the whole year. If the LONGi modules are used in the grid-connected system, the tilt angle should be calculated based on the principle to maximize the yearly output power.

Mechanical Installation

Regular Requirements

• Make sure that the installation method and mounting structure are solid enough to meet the expected load-bearing requirement, which is a requisite assurance from the PV system installer. Installation bracket system shall be tested and inspected by the third-party testing institution with static mechanical analysis capacity by local national standards or international standards.
• The mounting structure shall be made from durable, corrosion-resistant, UV-proof materials.
• Modules shall be fixed on the bracket solidly.
• In regions with heavy snowfall in winter, adjust the height of the mounting system so that the lower edge of the module is not covered by snow. Also, to reduce the risk of hot spots caused by flying sand and rocks damaging the module and shading, the lowest point of the module should be at a certain height to avoid the module being blocked by weeds and shrubs growing on the ground.
• If modules are installed on brackets parallel to the roof, the minimum gap between the module frame and the roof/wall shall be 10cm which is good for air circulation to achieve better performance of the module. Make sure the building is suitable for installation before installing modules on the roof. Moreover, seal properly to prevent leakage.
• The module frames can encounter thermal expansion and cold contraction. So the minimum distance between two adjoining modules shall be no less than 10 mm (0.39 inch). The specific space interval can be calculated according to the actual installation tolerance and deformation of the mounting bracket.
• Ensure that the back sheet and the front and rear glass of the module will not directly touch the mounting bracket, building structure, and environmental foreign objects (such as stones), especially under the action of external force, which will cause damage to the packaging back-sheet and glass, and therefore the product warranty is invalid.
• The maximum static load of the PV module is downforce 5400 Pa and uplift force 2400 Pa, which can vary from different mounting methods of the modules (please refer to the following installation guidance), the described load in this manual is for the test load.
• Note: based on IEC 61215-2016 installation requirements, when computing the corresponding maximum design load, a safety factor of 1.5 needs to be considered in compliance with the local laws or regulations. (Test load = design load *1.5 times safety factor)
• The modules can be installed in either landscape or portrait orientation. When installing the modules, be cautious not to block the drain hole of the frame. (* Note: For the modules to prevent dust accumulation, the anti-soiling modules must be mounted in portrait orientation.)

Module Mechanical Installation

Module and bracket system connections can be realized by mounting holes, clamps, or embedded systems. Installation shall follow the demonstration and suggestions below. If the installation mode is different, please consult LONGi customer service personnel and obtain approval. Otherwise, modules may be damaged and the limited warranty will be invalid. (* Note: regarding Anti- Soiling modules only, short edge design has been applied to prevent dust from accumulating on modules, therefore, do not install at the short edge. For special solar farm application scenarios such as heavy wind loads, valleys, and cliffs, the installation method needs to be reinforced, and it is recommended to use an Oval Washer, Flange nuts, bolts, clamps used together, and other reinforcement installation methods. For specific inquiries, please consult LONGi’s customer service.

Bolts Mounting

The LONGi module has mounting holes matching M6 and M8 bolts. See Figure 4 for installation details and corresponding hole positions.

Apply bolts to fix modules on the bracket through mounting holes on the back- side frame. See details in Figure 5.

Recommended accessories are as below:

Clamp Mounting

• The module can be mounted by a dedicated clamp, as shown in Figure 6.
• Under no circumstances should the clamp touch the glass or deform the frame. The interface of the clamp to the front of the frame must be smooth and flat to prevent the frame or other components from being damaged.
• Make sure that clamps cause no shadows.
• Clamps cannot block the drain holes of the module.
• For framed PV modules, it is recommended that the length of the clamp be at least 50mm and the clamp must maintain an overlap of 10-12 mm with the frame of the module (For clamp installation with an overlap of less than 10mm, LONGi technicians need to be consulted for assessment).
• Regarding the reference value of tightening torque, it is suggested that the M8 bolt is 12 -16 N•m， and the M6 is 8 -12 N•m.

Installation and Mechanical Load of Mono-facial Module

• Mono-facial modules can be mounted by bolts or clamps. The mounting method and maximum test load are shown as follows (The unit of distance and length in the table below is millimeter (mm), and the unit of pressure is Pascal (Pa)).

The maximum test load of framed mono-facial modules:

Installation

Method

Module Type

| Bolts Mounting|
---|---|---
Mounting rails cross the long frame| Mounting rails cross the long frame| Mounting rails

cross the short frame

| Clamps are mounted at the corners of short frame
Outer Four-hole| Inner Four-hole| 250≤D≤ 350| 350≤D≤ 450| 450≤D≤ 550| 150≤E≤ 250
54/60-cell Framed Mono-facial Modules|

LR5-54HPH-Mx*

|

±2400

| +5400，-2400| +5400，-2400|

/

|

/

|

±2400

| +2400，-1800

LR5-54HPB-xxxM*

|

±2400

| +5400，-2400| +5400，-2400|

/

|

/

|

±2400

| +2400，-1800

LR5-54HNB-xxxM*

|

±2400

| +5400，-2400| +5400，-2400|

/

|

/

|

±2400

| +2400，-1800

LR5-54HTH-Mx*

|

±2400

| +5400，-2400| +5400，-2400|

/

|

/

|

±2400

| +2400，-1800

LR5-54HTB-xxxM*

|

±2400

| +5400，-2400| +5400，-2400|

/

|

/

|

±2400

| +2400，-1800

LR5-66HPH-xxxM

| +5400，-2400|

±2400

|

/

| +5400，-2400|

/

|

±1800

|

±1600

LR5-66HTH-xxxM

| +5400，-2400|

±2400

|

/

| +5400，-2400|

/

| +1800，-1400| +1600，-1400
72-cell Framed Mono-facial Module|

LR5-72HPH-xxxM

| +5400，-2400|

±2400

|

/

|

/

| +5400，-2400|

/

|

/

LR5-72HTH-xxxM

| +5400，-2400|

±2400

|

/

|

/

| +5400，-2400|

/

|

/

LR5-72HPH-xxxM*

| +5400，-2400|

/

|

/

|

/

| +5400，-2400|

/

|

/

LR5-72HTH-Mx*

| +5400，-2400|

/

|  |  | +5400，-2400|

/

|

/

LR5-72HTHF-Mx*

| +5400，-2400|

/

|

/

|

/

| +5400，-2400|

/

|

/

• LONGi Mono-facial modules can be matched with the mainstream mounting systems in the industry.
• The test load of the module with typical mounting systems is as follows. As for other special mounting systems that are not included in the table below, please consult LONGi customer service personnel.
• The above data is based on the static load requirements of the IEC61215 standard (Tested by LONGi or a third-party certification institution).

Installation and Mechanical Load of Bifacial Module

• Bifacial modules can be mounted by bolts or clamps. The mounting method and maximum test load are shown as follows.
• (The unit of distance and length in the table below is millimeters (mm), and the unit of pressure is Pascal (Pa)).

The maximum test load of framed Bifacial modules:

Mechanical loads information of 66/72/78-cells with framed bi-facial dual glass modules:

• LONGi bifacial modules can be matched with the mainstream bracket systems in the industry.
• The matching test load is as follows (for other bracket systems matching information which are not specified or included in the table below, please consult LONGi customer service personnel).

1. LONGi recommends that the maximum torque value of bolts used at ATI Hi-rise 300mm should be 19 N•m.
   • LONGi’s special modules for flexible racking can be matched and installed with industry flexible racking systems, and the matching test loads are as shown in the following table (for other unspecified bracket systems and LONGi products, please consult
   • LONGi’s customer service personnel).

Module Type| Compatible Support Brackets| Mounting Hardware| Test Load (Pa)
---|---|---|---
LR5-72HBD-Mx*| Tian Zhi Jie’s flexible racking| 2 cables flexible racking:
M8 Bolt+ double hole washer 1300+1400mmhole position| +3600，-2400

1. The above data is based on the static load requirements of the IEC61215 standard (Tested by LONGi or a third-party certification institution).

Electrical installation

Electrical Performance

• There are tolerances between the rated values of the electrical performance under STC and measured values. Including Isc, Voc, and Pmax under STC (1000 W/m2 Irradiance, a cell temperature of 25 ℃ and an AM1.5).
• When modules are in a series connection, the string voltage is the sum of every individual module in one string.
• When modules are in parallel connection, the current is the sum of the individual modules as shown in Figure 9. Modules with different electric performance models cannot be connected in the same string.
• The maximum allowed quantity of modules in string connection shall be calculated according to relative regulations. The open circuit voltage value under the expected lowest temperature shall not exceed the maximum system voltage value allowed by modules and other values required by DC electric parts. (LONGi modules maximum system voltage is DC1000V/DC1500V— actual system voltage is designed based on the selected module and inverter model.)
• The correction value of VOC can be calculated by the following formula.
• CVoc=1-βVoc×(25-T)
• T: The expected lowest temperature of the installation site.
• β: VOC temperature coefficient (% /℃) (Refer to module datasheet for further detail)
• If there is reverse current exceeding the maximum fuse current flowing through the module, use an overcurrent protection device with the same specifications to protect the module.
• If the quantity of parallel connections is more than 2, there must be an overcurrent protection device on each string of the module.

Cables and Wiring

• PV Module’s junction boxes with the IP67 protective level can provide safety protection for cable and wiring connections, and also for contact protection of non-insulating electric parts.
• Each module has two individual wires connecting the junction box, one is a negative pole and the other is a positive pole.
• Two modules can be in series connection by inserting the positive pole at one end of the wire of one module into the negative pole of the adjoining module.
• According to local fire protection, building, and electrical regulation, apply proper cable and connector; ensure the electrical and mechanical property of the cables (the cables should be put in a catheter with anti-UV aging properties, and if exposed to air, the cable itself should have anti-UV aging capability).
• The installer can only use single-wire cable, ≥ 4mm2 (12 AWG), 90 ℃, with proper insulation capability to withstand the maximum open circuit voltage (such as EN50618 approval). Need to select appropriate wire specifications to reduce voltage drop.
• LONGi requires that all wiring and electrical connections comply with the appropriate National Electrical Codes.
• When cables are fixed on the bracket, avoid mechanically damaging cables or modules. Do not press cables by force. Adopt UV-resistant cable ties and clamps to fix cables on the bracket. Though cables are UV-resistant and waterproof, it is still necessary to prevent cables from direct sunlight and water immersion.
• The minimum allowed bending radius of cables should be 43mm. (1.69 inch)

Connector

• Please keep connectors clean and dry. Make sure connector caps are fastened before connection.
• Avoid foreign objects such as moisture, dust, and organisms from entering the connector, which may cause the connector to fail to work properly or be damaged.
• If the connector is wet, it is forbidden to connect.
• If the connector is contaminated, it is forbidden to connect it.
• If the connector is not connected positively with negatively, the connector is not waterproof.
• The components need to be connected as soon as possible after installation, and the connectors should meet the requirements of IP68 (IEC60529) after the connection. If the connector cannot be connected on time or the installation place is rainy and foggy, it is recommended to add a connector protection device.
• Avoid connectors from direct sunlight and water immersion.
• Avoid connectors falling onto the ground or roof. Incorrect connection may lead to electric arc and electric shock. Please make sure that all electric connections are reliable. Make sure all connectors are fully locked.
• Do not connect different connectors (brand and model).

Bypass diode

• LONGi solar module junction box contains a bypass diode which is in parallel connection with the cell string.
• If a hot spot occurs, the diode will come into operation to stop the main current from flowing through the hot spot cells to prevent module overheating and performance loss. Note, that a bypass diode is not the overcurrent protection device.
• If the diode is definite or suspected to be defective, the installer or system maintenance supplier shall contact LONGi. Please do not try to open the module junction box on your own.

PID Protection and Inverter Compatibility

1. PV modules may appear as Potential Induced Degradation (PID) under high humidity, high temperature, and high voltage conditions. Modules may appear as Potential Induced Degradation (PID) under the conditions below:

   • PV modules are installed under hot and humid weather conditions.
   • PV modules installation site is under a long-term humid environment such as water floating application.

2. To reduce the risk of PID, on the module’s DC connection site, it is recommended to connect the negative to the ground. The PID protection measures on the system level are recommended as follows.

   • For isolated PV inverters, it is recommended to use the negative electrode potential lift scheme (PV/PE),
     the AC voltage neutral point potential lift scheme (N/PE) or the reverse bias recovery scheme.

   • For a non-isolated PV inverter, an isolated transformer needs to be equipped before applying the virtual grounding method for the inverter.

Grounding

• In the design of modules, the anodized corrosion-resistant aluminum alloy frame is applied for rigidity support. For safety considerations and to protect modules from lightning and electrostatic damage, the module frame must be grounded. The grounding device must be in full contact with the inner side of the aluminum alloy and penetrate the surface oxide film of the frame.
• Do not drill additional grounding holes on the module frame.
• The grounding conductor or wire may be copper, copper alloy, or any other material acceptable for application as an electrical conductor per respective National Electrical Codes. The grounding conductor must then make a connection to the ground with a suitable ground electrode.
• There are grounding holes with a diameter of Ø4.2 mm at the edge location of the module’s back-side frame. The ground-ing hole on the frame is marked with a typical grounding symbol ( ) according to the IEC 61730-1 standard, which can only be used for grounding, not for module installation.
• Grounding between modules shall be confirmed by qualified electricians and grounding devices shall be manufactured by qualified electric manufacturers.
• The copper core wire used for the grounding clamp is recommended to be 12 AWG. Copper wires cannot be pressed during installation in case of damage.

The following is one of the recommended grounding methods for LONGi modules:

• Align the grounding clamp to the frame mounting hole. Use a grounding bolt to go through the grounding clamp and frame.
• Put the tooth side of the washer on the other side and fasten the nuts.
• Put grounding wires through the grounding clamp and grounding wire material and dimension shall meet requirements in local national and regional laws and regulations.
• Fasten bolts of grounding wires and then installation is completed.
• Mounting holes on modules that are not occupied can be used for installing grounding devices.
• The third-party grounding device can be used for grounding of LONGi modules but such a grounding method shall be proved to be reliable.
• The grounding device shall be operated in line with the stipulations of the manufacturer.

Operation and maintenance

• It is the users’ responsibility to carry out regular inspections and maintenance for modules, especially during the period of limited warranty.
• To inform the LONGi customer service personnel within two weeks when modules are found broken or other significant abnormalities.
• Refer to the LONGi PV Module Operation and Maintenance Manual for details on module maintenance.

Cleaning

• Accumulated contaminants on module surface glass will reduce the power output and lead to local hot spots, such as dust, industrial wasted water, and birds’ droppings.
• The severity of influence is determined by the transparency of waste. Small amounts of dust will affect the intensity and evenness of received solar irradiation but are not dangerous and power will not be reduced remarkably generally.
• During the operation of modules, there shall be no environmental factors to shade modules fully or partially. These environmental factors include other modules, module mounting systems, bird dwelling, dust, soil, or plants. These will significantly reduce the output power. LONGi suggests that the module surface should not be shadowed in any case.
• The frequency of cleaning depends on dirt accumulation speed. In normal situations, rainwater will clean the module surface and reduce the cleaning frequency. It is suggested to use a sponge dipped in clean water or a soft cloth to wipe the glass surface. Do not use acid and alkaline detergents to clean modules. Do not use a tool with a rough surface to clean in any case.
• To avoid the potential risk of electrical shock or burn, LONGi suggests cleaning the modules during the early morning or evening with low irradiance and low module temperature, especially for the hot regions.
• To avoid the potential risk of electrical shock, do not try to clean the modules with glass damage or expose wires.

Module Appearance Inspection

• Check module cosmetic defects with naked eye, especially:

• Module glass cracks. Special attention: avoiding rolling up sand and gravel to break the glass during the inspection of the operation and maintenance vehicles; Avoiding defects or breakage of glass caused by splashing of hard objects such as sand and gravel when using a lawn mower for weeding operations.
  Corrosion at welding parts of the cell main grid (caused by moisture into the module due to damage of sealing materials during installation or transportation).

• Check whether there are traces of burning marks on the module back sheet.

• Check PV modules for any signs of aging including rodent damage, climate aging, connectors tightness, corrosion, and grounding condition.

• Check if any sharp objects are in contact with the PV modules’ surface.

• Check if any obstacles shading the PV modules.

• Check if any loose or damaged screws between the modules and mounting system. If so, adjust and fix it in time.

Inspection of Connectors and Cables

• It is suggested to carry out the following preventive inspection twice a year:
• Check the tightness of the connectors and cables.
• Check if any crack or gap of silicone near the junction box.

Release and execution

• This manual is implemented and managed by the product management department of LONGi, who reserves the right to modify and revise this manual at any time without prior notice.
• LONGi Solar Technology Co, Ltd.
• No.8369 Shangyuan Road, Xi’an Economic & Technological Development Zone
• www.longi.com

Documents / Resources

| LONGi LR5-54HPH Solar PV Modules [pdf] Instruction Manual
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References

• The World’s Leading Supplier of Solar PV Solutions-LONGi

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