TONGWEI TWMPD-78HS Photovoltaic Module Installation Guide

TONGWEI TWMPD-78HS Photovoltaic Module

Specifications

• Manufacturer: TONGWEI CO.,LTD
• Module Types: Monofacial Module, Bifacial Module

Available Models:

• TWMPD-78HS, TWMPD-72HS, TWMPD-66HS, TWMPD-60HS, TWMPD-54HS, TWMPD-54HB, TWMND-78HS, TWMND-72HS, TWMND-66HS, TWMND-60HS, TWMND-54HS, TWMND-54HB, TWMPD-78HD, TWMPD-72HD, TWMPD-66HD, TWMPD-60HD, TWMND-78HD, TWMND-72HD, TWMND-66HD, TWMND-60HD
• TWMPF-66HS, TWMPF-60HS, TWMPF-54HS, TWMPF-55HS, TWMPF-50HS, TWMPF-66HD, TWMPF-60HD, TWMPF-55HD, TWMPF-54HD, TWMPF-50HD, TWMHF-66HD, TWMHF-60HD
• TWMNG-72HS, TWMNH-66HS, TWMNG-72HD, TWMNG-54HD, TWMNG-54HC, TWMNH-66HD, TWMNH-48HD, TWMNH-48HC

Product Usage Instructions

1. Purpose of this Manual
   This manual is designed for the installation of solar photovoltaic modules manufactured by TONGWEI Co., Ltd. It provides information on installation methods, operation safety, and maintenance practices for these modules.

2. Disclaimer
   TONGWEI Co., Ltd. will not be liable for any losses resulting from the improper installation, operation, use, or maintenance of the modules. Users must adhere to the guidelines outlined in this manual to avoid breakdowns or damages.

3. Safety & Transport

4. General Rules
   Installers must strictly follow all rules outlined in this manual as well as local regulations. Modules should only be installed by trained professionals.

5. Electrical Performance Safety
   Prior to installation, installers must be familiar with the electrical requirements of the modules to ensure safe operation.

6. Package Labeling Instructions
   Follow the package labeling instructions for unloading, transportation, and storage of the modules.

7. Unloading, Transportation, Storage
   Handle unloading, transportation, and storage of the modules with care to prevent damage.

8. Unpacking Description
   Refer to the unpacking description for guidance on safely unpacking the modules.

FAQ

• Q: Can I install the modules myself?
  A: Modules must be installed by professionals to ensure proper installation and compliance with safety regulations.

• Q: What should I do with old modules?
  A: When replacing old modules with new ones, retailers are legally obligated to take back the old modules for disposal free of charge. Do not dispose of electrical appliances as unsorted municipal waste.

Photovoltaic Module Installation Manual
of TONGWEI CO.,LTD

This manual applies to Modules types:

| With ½ cut of 182 mono c-Si cell| With ½ cut of 210210 mono c-Si cell| With ½ cut of 182.2191.6 mono c-Si cell| *With ½ cut of 182210 mono c-Si cell**
---|---|---|---|---
Monofacial Module| TWMPD-78HS| TWMPF-66HS| TWMNG-72HS| TWMNH-66HS
TWMPD-72HS| TWMPF-60HS| |
TWMPD-66HS| TWMPF-54HS| |
TWMPD-60HS| TWMPF-55HS| |
TWMPD-54HS| TWMPF-50HS| |
TWMPD-54HB
TWMND-78HS
TWMND-72HS
TWMND-66HS
TWMND-60HS
TWMND-54HS
TWMND-54HB
Bifacial Module| TWMPD-78HD| TWMPF-66HD| TWMNG-72HD| TWMNH-66HD
TWMPD-72HD| TWMPF-60HD| TWMNG-54HD| TWMNH-48HD
TWMPD-66HD| TWMPF-55HD| TWMNG-54HC| TWMNH-48HC
TWMPD-60HD| TWMPF-54HD| |
TWMND-78HD| TWMPF-50HD| |
TWMND-72HD| TWMHF-66HD| |
TWMND-66HD| TWMHF-60HD| |
TWMND-60HD

• Meaning of crossed-out wheeled dustbin: Do not dispose of electrical appliances as unsorted municipal waste, use separate collection facilities. Contact your local government for information regarding the collection systems available.
• If electrical appliances are disposed of in landfills or dumps, hazardous substances can leak into the groundwater and get into the food chain, damaging your health and well-being.
• When replacing old appliances with new ones, the retailer is legally obligated to take back your old appliance for disposals at least free of charge.

PURPOSE OF THIS MANUAL

• This manual applies exclusively to the solar photovoltaic module (here in after referred to as Module) of TONGWEI Co., Ltd. (here in after referred to as TW). The contents of this manual involve the installation methods, operation safety and maintenance information of TW’s Modules.
• Modules must be installed by professionals. Please read this manual carefully before installation. The installers must follow all the rules in this manual strictly as well as local requirements and regulations by law or authorized organizations.
• Before installing, the installer must be familiar with their mechanical and electrical requirements. Please keep this manual in a safe place for future reference (care and maintenance) and in case of sale or disposal of the Modules.

DISCLAIMER

• TW shall not be responsible for any loss arising from the installation, operation, use or maintenance of the Modules which is not complying with the guidance of this manual, including breakdown or damage of the Modules or any other expenses incurred.
• Any customer shall not get any patent or authorization of the patent when using the Modules, expressed or implied. Any infringement of patents or other rights of the third party, which may result from the use of the Module, is not within the responsibility scope of TW. The information in this manual is based on TW’s knowledge and experience and is believed to be reliable, but such information including product specification (without limitation) and relevant suggestions do not constitute a warranty, expressed or implied.
• TW reserves the rights to change the manual, the Modules, the specifications or any other information of the Modules without prior notice.

SAFETY & TRANSPORT

General Rules

• Keep all the Modules and electrical connectors clean and dry before installation.
• Use both hands to carry Modules. Do not overlap Modules.
• Be cautious when carrying Modules. Slip-proof gloves are necessary.
• Use supportive disassembling tools when unpacking.
• The application level of TW module is Class A, which can be used in systems operating at greater than 50 V DC or 240W.

Modules handling and installation instructions

Electrical Performance Safety

• PV modules can produce DC current under sunlight. Any contact of exposed metal at module’s wiring parts may result in electrical shock or burn. Any contact of 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.
• PV modules do not have switches，operating of PV modules can only be stopped when they are kept from sunlight or covered by hard board or UV-proof materials or when the angle of the modules facing sun are placed on smooth and flat surfaces.
• To avoid electric arc and electric shock hazards，please do not break down electric connection in loaded conditions. Incorrect connections will also lead to 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 connection by whatever means.
• Snow, water or other reflective medium in surrounding environments that intensify light re-flection will increase output current and power. And module voltage and power will increase under low temperature condition.
• If module glass or other sealing materials are damaged, please wear personal protective equipment and then isolate modules from the circuit.
• Work only under dry conditions， and use only dry tools. Do not operate when modules are wet unless you wear personal protective equipment. Please follow the cleaning requirements in this manual when cleaning modules.
• Installation must be carried out under the guidance of a qualified electrician.
• No matter how weather condition is, personnel entering the power station shall wear safety helmet, insulating gloves and insulating shoes correctly, taking-safety protection measures.

Package labeling instructions
Before the operation, it is necessary to read carefully the unpacking instruction and outer packing box instruction, and carry out the operation as instructed.

1. DO NOT expose the module to rain or moisture.| 2. The Modules in the carton box are fragile. Handle with care.
---|---
3. The package shall never be upside down during the transportation.| 4. It is prohibited to stamp on the packing box and module.
5. During the stacking of the Modules, the outer packing box can be stacked not exceed the maximum layer allowed .(n=2 means it is allowed to stack for at most two layers.)| 6. One module shall be handled by two people together.

Unloading, Transportation and Storage

• When the Modules are delivered to the project site, the freight car should be ready in the flat, even and open area for parking and unloading.
• Forklift unloading: Choose the appropriate carrying forklift according to the commodity weight, unload the Modules from the freight car and place them on flat ground
• Unloading with a crane: Affix the lifting belt in the wood supporting frame buckle (Fig. 1, 2). It is allowed only to lift one pallet at a time. Before lifting, it is necessary to confirm whether the pallet and paper box are damaged and ensure that the lifting rope is robust and firm. When being lifted close to the ground, the paper box will be gently placed in a relatively flat position on the project site by two people, one on each side.
• It is forbidden to stack the modules on the project site.
• During the transportation at the project site, the Modules shall not be stacked，only one layer shipping is allowed.
• Storage in the project site warehouse:
• Storage environment requirements: Humidity＜85%, temperature -20 ~+50℃; Modules statically stacked for ≤2 layers.
• Temporary storage at the project site: The Modules shall be stored in a dry, well-ventilated place. They shall not be stacked but shall be covered with waterproof cloth to prevent dampness in the Modules.

Unpacking description

• In the outdoor unpacking process, it is prohibited to operate in rainy conditions.
• If there is wind in the field, special attention shall be paid. Particularly in the event of heavy wind, it is recommended not to handle the module, and it is necessary to properly secure the unpacked Modules.
• The working surface shall be such that the packing box can be placed in a stable, level position, avoiding being overturned.
• During the unpacking, it is necessary to wear protective gloves, and avoid scratching the hands and leaving the fingerprints on the glass.
• In the case of operation not according to the requirements or in the case of an unskillful operation, it will result in the fall-off of the protective corner in small amounts, which will be normal. The effect of the protective corner is to reduce damage due to external force during transport, and the fall-off of the protective corner will not influence the reliability of the Modules.
• Before the unpacking, it is necessary to carefully check the product information on the carton box, and carefully read the unpacking instruction.
• Every module shall be carried by two people. When carrying the module by two people, it is prohibited to pull the junction box.

MECHANICAL INSTALLATION

Location Selection

• Select suitable places to install Modules.
• Install Modules at the places with sufficient sunlight and without shade at any time. If a module is shaded or even partially shaded, it will result in lower power output. A permanent or regular shade will cause module damage, which will result in the invalidity of product’s limited warranty.
• Do not store, install or use Modules at the places where combustible gas is easily generated or gathering.
• Modules can be installed on land 50 to 500m away from the coastline. However, the connectors must be well protected or a dust-proof plug must be added when installing Modules within this distance. Connect the dust-proof plug immediately after removing it，and take other anti-rust measures to prevent the parts from rusting.
• Modules in the same string should be installed at the same angle. Modules installed in different angles will receive different irradiation, which will cause current different. As a result, it will decrease the operation efficiency of the system.

Installation requirements

• Ensure the module installation method and support system sufficiently robust, so that the Modules can undertake the preset loading conditions, the support installer or supplier shall provide necessary guarantee and other related certifications. The installation support system shall pass the inspection and test by the third-party test institution with the static mechanic analysis capability, and use the local national or international standards, such as DIN1055 or equivalent.
• The support structure shall be made of the durable, corrosion resistant and ultraviolet resistant materials.
• The module shall be firmly mounted on the support.
• Choose proper installation height of the photovoltaic support system, and ensure the lowest part of the module is high enough, to avoid being shaded by plant or being damaged by the flying sand. Or being covered by snow for a long time in winter.
• When the module is installed on the roof or the building, it is necessary to ensure that the roof structure is fixed firmly and will not be damaged by heavy wind or heavy snow, and the back of the module shall be well-ventilated to facilitate the cooling of the module.
• Due to the thermal expansion of physical properties of materials, the Modules are asymmetric structure, which will produce a certain degree of warping deformation at different temperatures, which does not affect the installation, use and reliability of the Modules. The minimum distance between two Modules should not be less than 10 mm.
• Ensure that the module backside will not contact the support or architectural structure even if there is the module surface is under the external pressure.
• It is required to observe the instruction guide and safety rules attached on the support.
• It is not allowed to drill the hole in the glass surface or frame of the module. Otherwise ,the guarantee will be invalidated.
• When to install the Modules on the roof, it is necessary to guarantee the roof structure is suitable for the module installation. And the installed modules should not be beyond the roof zone. Additionally, the roof area where it is penetrated by module installation shall be properly sealed to prevent the roof from water leakage.
• When the module is installed on the supporting column, it is necessary to ensure the supporting column and module installation structure is capable of withstanding the expected local wind.

Installation method

Installation with the mounting clamp

Table 2 Installation method and load capacity

| | Table 2 Installatio| n method and load ca| pacity|
---|---|---|---|---|---
Classification| Installation method| method A| method B| method C| method D
Modules model| Height of the frame (mm ）| Mounting clamp position K (mm)| Test load: front/back, （ Pa ）| Mounting clamp position K (mm)| Test load: front/back, （ Pa ）| Mounting clamp position K (mm)| Test load: front/back,

（ Pa ）

| Mounting clamp position K (mm)| Test load: front/back, （ Pa ）
Mono facial Module| TWMPD-54HS TWMPD-54HB TWMND-54HS TWMND-54HB|

B30

| A/4±50| 5400/2400| 200 ～ 300| 3600/2400| 100 ～ 240|

±1600

| 100 ～

240

| ±1600
TWMPD-60HS TWMND-60HS| B35| 5400/2400| 300 ～ 400| 3600/2400| 100 ～ 240| ±1600| 100 ～

240

| ±1600
TWMPD-66HS TWMND-66HS|

B35

|

5400/2400

|

—

|

—

| 0～ B/4| ±1200 ( special clamp )| 150 ～ 240| ±1600

TWMPD-72HS TWMND-72HS

| B30| 5400/2400| —| —| —| —| —| —
B35| 5400/2400|

—

|

—

| 0～ B/4| ±1200 ( special clamp )|

—

|

—

TWMPD-78HS TWMND-78HS| B35| 570~630| 5400/2400| —| —| —| —| —| —
TWMPF-50HS| B35| 360~420| 5400/2400| —| —| —| —| —| —
TWMPF-55HS| B35| 440~540| 5400/2400| —| —| —| —| —| —
TWMPF-54HS| B35| 360~430| 5400/2400| —| —| —| —| —| —
TWMPF-60HS| B35| 360~420| 5400/2400| 365~435| 3600/2400| 45~485| ±1000| —| —
TWMPF-66HS| B35| 440~540| 5400/2400 ( special clamp )|

—

|

—

|

—

|

—

|

—

|

—

TWMNG-72HS| B35|

A/4±50

| 5400/2400|

A/4±50

| 5400/2400| —| —| —| —
TWMNH-66HS| B35| 5400/2400| 5400/2400| —| —| —| —
Bifacial Module| TWMPD-60HD TWMND-60HD| B30| A/4±50| 5400/2400|

A/4±50

| 3600/2400| —| —| —| —
TWMPD-66HD TWMND-66HD| B30| 5400/2400| 3600/2400| —| —| —| —
TWMPD-72HD TWMND-72HD| B30| 5400/2400| 3600/2400| —| —| —| —
B35| 5400/2400| 3600/2400| —| —| —| —
TWMPD-78HD TWMND-78HD| B30| 5400/2400| —| —| —| —| —| —
B35| 5400/2400| —| —| —| —| —| —
TWMPF-50HD| B35| 5400/2400| —| —| —| —| —| —
TWMPF-55HD| B35| 5400/2400| 440~540| 3600/2400| —| —| —| —
TWMPF-54HD| B35| 5400/2400| —| —| —| —| —| —
TWMPF-60HD TWMHF-60HD| B35| 5400/2400| 360~420| 3600/2400| —| —| —| —
TWMPF-66HD TWMHF-66HD| B33| 5400/2400| —| —| —| —| —| —
B35| 5400/2400| 440~540| 3600/2400| —| —| —| —
TWMNG-54HC TWMNG-54HD| B30| 5400/2400| —| —| four angles| ±1200| 100～240| ±1600
TWMNG-72HD| B30| 5400/2400| A/4±50| 3600/2400| —| —| —| —
TWMNH-48HC TWMNH-48HD| B30| 5400/2400| —| —| four angles| ±1200| 100～240| ±1600
TWMNH-66HD| B30| 5400/2400| A/4±50| 3600/2400| —| —| —| —

Note: Test load = γm(safety factors) × design load，some installation methods require special clamp, please consult technical support department of TW for special clamp structure shape

Installation with the mounting hole

Table 4 Mounting dimension and load capacity

| Tabl| e 4 Mou| nting dimension| and load capaci| ty|
---|---|---|---|---|---|---
Classification| Modules model| Height of the frame (mm)| The mounting clamp position M(mm)| The mounting clamp position N(mm)| Installation Method E Test load: front/back （ Pa ）| Installation Method F Test load: front/back ， (Pa)
Monofacial Module| TWMPD-54HS TWMPD-54HB

TWMND-54HS TWMND-54HB

| ****

B30

| ****

990

| ****

1085

| ****

5400/2400

| ****

—

TWMPD-60HS TWMND-60HS| ****

B35

| 990| 1085| 5400/2400| —
1400| 1085| ±2400| —
TWMPD-66HS TWMND-66HS| ****

B35

| 990| 1085| ±2400| —
1400| 1085| 5400/2400| —
TWMPD-72HS TWMND-72HS| B30| 1400| 1096| 5400/2400| —

B35

| 990| 1085| ±2400| —
1400| 1085| ±5400| —
TWMPD-78HS TWMND-78HS| B35| 1200| 1085| 5400/2400| —
TWMPF-50HS| B35| 1400| 1055| 5400/2400| —
TWMPF-55HS| B35| 1400| 1055| 5400/2400| 3600/2400
TWMPF-54HS| B35| 1400| 1262| 5400/2400| —
TWMPF-60HS| B35| 1400| 1262| 5400/2400| 3600/2400
TWMPF-66HS| B35| 1400| 1262| 5400/2400| 3600/2400
TWMNG-72HS| ****

B35

| 790| 1085| ±2400| ±2400
1400| 1085| 5400/2400| 5400/2400
TWMNH-66HS| ****

B35

| 790| 1085| ±2400| ±2400
1400| 1085| 5400/2400| 5400/2400
Bifacial Module| TWMPD-60HD TWMND-60HD| ****

B30

| 1200| 1096| 5400/2400| —
1400| 1096| 3600/2400| —
TWMPD-66HD TWMND-66HD| ****

B30

| 1200| 1096| 3600/2400| ±2400
1400| 1096| 5400/2400| 3600/2400
TWMPD-72HD TWMND-72HD| ****

B30

| 1200| 1096| 5400/2400| —
1400| 1096| 3600/2400| —

B35

| 1200| 1096| 5400/2400| ±2400
1400| 1096| 3600/2400| 3600/2400
TWMPD-78HD TWMND-78HD| B30| 1200| 1096| 5400/2400| —
B35| 1200| 1096| 5400/2400| —
TWMPF-50HD| B35| 1400| 1055| 5400/2400| —
TWMPF-55HD| B35| 1400| 1055| 5400/2400| 3600/2400
TWMPF-54HD| B35| 1400| 1262| 5400/2400| —
TWMPF-60HD TWMHF-60HD| B35| 1400| 1262| 5400/2400| 3600/2400
TWMPF-66HD TWMHF-66HD| B33| 1400| 1262| 5400/2400| —
B35| 1400| 1262| 5400/2400| 3600/2400
TWMNG-54HC TWMNG-54HD| B30| 1100| 1096| 5400/2400| —
TWMNG-72HD| ****

B30

| 790| 1096| ±2400| ±2400
1400| 1096| 5400/2400| 5400/2400
TWMNH-48HC TWMNH-48HD| B30| 1100| 1096| 5400/2400| —
TWMNH-66HD| B30| 790| 1096| ±2400| ±2400
1400| 1096| 5400/2400| 5400/2400

Note: Test load = γm(safety factors) × design load.

Modules can be installed and fixed using the following installation methods：
Bolt hole installation：Use anti-corrosion bolts to secure with the mounting brackets through the mounting holes on the assembly frame, as shown in Figure 3;

Recommended bolt kits are as follows：

is hot- dip galvanized or stainless steel, and the material selection is selected according to the local environment.
Washer| 2pcs,thickness≥1.5mm and outside diameters≥16mm| 2pcs,thickness≥1.5mm and outside diameters= 12～16mm
Spring Washer| 8mm| 6mm
Nut| M8| M6
Bolt tightening torque range （N·m）| 16~20| 8~12

Briquette installation: Use a suitable briquette and fix it with components and mounting brackets, as shown in Figure 4.
The briquette must maintain at least 10mm overlap with the component frame (to ensure reliable installation of the component, the section of the briquette can be changed), and the bolt torque of the fixed briquette should be determined according to the mechanical design standards of the bolts and briquettes used by the customer, such as：M8：16~20 N·m。

ELECTRICAL INSTALLATION

DC power generated by the photovoltaic system can be converted into AC power and fed into the grid. Policies on connecting renewable energy system to the grid vary from region to region. Consult senior system designer before designing the system. Generally, the system installation shall be formally approved by the local public sector.

General Installation

• Installation structure should be compatible with module, in order to avoid galvanic corrosion. Any defects caused by such corrosion will void the warranty.
• The DC-side system potential of the photovoltaic array includes the practice of floating ground, positive-pole grounding and negative-pole grounding according to the system requirements; and different cell technologies have different adaptability. In a power-station project, particularly the module of the crystalline silicon photovoltaic cells, too large an absolute value of the negative to the ground might cause potential induced degradation (PID). Consequently, it is appropriate to use the negative grounding system so that the potential of the circuit is positive. Consult the inverter manufacturer for details.
• It is forbidden for non-professionals to open the lock nuts of the connector. Make sure that the connectors are clean, dry and fully connected (A click sound should be heard when fully connected), otherwise it may lead to electric arc sparks which will damage the connector or cause a fire.
• The connector given to the customer or the connector purchased by the customer and the junction box connector used in the order component must remain of the same brand and the same specification model, and connectors of different brands/specifications are not allowed to plug each other.
• Under normal conditions, a module is likely to experience conditions that produce more current and/or voltage than reported at standard test conditions, Accordingly, the values of ISC and VOC marked on the Module should be multiplied by a factor of 1.25 when to determining component voltage ratings, current ratings, fuse sizes, and size of controls connected to the PV output.
• Completely cover the Modules with an opaque material to prevent electricity from being generated during disassembling the conductors.
• It is not allowed to use the Modules in different models in the same solar photovoltaic system. When the Modules are connected in series, the voltage of every string shall not be higher than the maximum voltage of the system (as shown in Figure 5). Reference equation of the maximum number of the Modules in serial connection: maximum system voltage of the module/ (1.25* open-circuit voltage)， Please refer to the country’s or local regulations for details.
• When connected in parallel, the current output is equal to the sum of each string’s current (as shown in Figure 6). Fuse is necessary for each module string. Take reference to the local regulation. Recommended maximum parallel Modules configurations: Fuse rating/ (1.25* short-circuit current). Please refer to the country’s or local regulations for details.
• Refer to the local regulations to determine the system wire size, types and temperatures.
• The cross section of the cables and the capacity of the connectors must be selected to suit the maximum system short circuit current (The recommended section area for a single piece of Module is 4 mm2, and the recommended rated current for the connector is greater than 20A, Please refer to the country’s or local regulations for details), otherwise the cables and connectors shall be overheated under large current. Caution: The maximal temperature of the cable is 85℃ while the upper limited temperature of the connector is 105℃.
• Make sure the electric components such as the connectors and inverters are off-state during the installation. To reduce lightning damage, the loop area should be kept as small as possible when laying cables. It is recommended to use fuses in each string.

PV module layout and wiring selection instructions
At present, the PV module arrangement is more common in single vertical row, double vertical row, single horizontal row, double horizontal row, as shown in Figure 7: The recommended cable length for different installation methods of each product is as follows:

Battery specifications| Modules model| Modules dimensions （ *LengthWidth/mm ）| Single/double vertical row Recommended cable length （ mm ）| Single/double horizontal row Recommended**

cable length （ mm ）

---|---|---|---|---

182/183.75

| 78| 24651134| ＋400/-200| ±1500
72| 22781134| ＋400/-200| ±1400
66| 20931134| ＋400/-200| ±1400
60| 19081134| ＋400/-200| ±1200
54| 1722*1134| ＋400/-200| ±1200

210

| 66| 23841303| ＋400/-200| ±1400
60| 21721303| ＋400/-200| ±1400

Notes：

1. The junction box cable length of the above components contains connectors；
2. This size is a reasonable size recommended and larger than the recommended size does not affect the installation.

Grounding

Grounding by cable
The grounding bolts must be made of stainless steel and be used in the specified grounding holes. First, make the stainless steel bolt pass through the spring washer, cup washer, flat washer, and star washer, and then insert through the grounding hole, flat washer and spring washer on the frame. Finally, tighten with a nut. Caution: The upper limited temperature of the conductor is 85℃. As for the installation, refer to Figure 8.

Grounding by lugs

• All the module frames and mounting structures shall be grounded according to regional and national electricity regulations. Use recommended hardware to connect grounding cables and fasten to the Module frames.
• While using the metal structure, make sure the surface of the system have been electroplated to keep a good conducting circuit.
• Use suitable grounding conductors to connect the Module frame to the mounting structure. This can achieve proper grounding effects.
• First, peel the grounding cable to a proper length without damage to the metal core. Then insert the peeled cable into the lug, tighten the screw. As shown in Figure 9, connect the lug to the aluminum frame with stainless steel bolts and connection components.

BYPASS DIODES AND BLOCK DIODES

• In a system with two or more Modules connected in series, if part of a Module is shaded while the other part is exposed to the sun, a very high reverse current will go through the cells which have been partly or entirely covered and it will cause overheat on the cells, which may damage the Module. Using bypass diodes can protect Modules from this kind of risk. There are bypass diodes in junction boxes, which can reduce the effects of partial shadows. Do not privately disassemble the junction box to replace the diodes, even when the diodes are broken. This should be processed by the professionals.
• In a system with batteries, if the controller doesn’t have the function of backswing protection, block diodes installed between the battery and the Module can prevent the reverse current from damaging the Module.

MAINTENANCE

Normally, the Modules do not need repair. Follow the maintenance methods below to ensure the best performance of the Modules:

• In most conditions, the normal rainwater can keep the module glass clean. Clean the glass surfaces with wet soft sponge or cloth if necessary. Use mild non-abrasive cleaning agent to remove stubborn dirt.
• Do not try to clean a Module with broken glass or perforated backsheet. It will cause serious electrical shock. Take a regular inspection on grounding, mechanical and electrical connections every 6 months. Make sure all the Module connectors are connected, clean and without damage or corrosion.
• When disassembling the connectors, must make sure all the components are working well; otherwise the connector’s shall be replaced. Damage on the connector will cause electronic leakage. The tightening torque of the nut should be 1.5 N • m – 3 N •m.
• Use opaque material to completely cover the Modules during repair to avoid electric shock. When exposed to the sunshine, the Modules will produce high voltage. The repair work must be carried out by professionals.

Warning: Shut down the system before any electric repair. Improper maintenance may cause electric shock or fire

Customer Service Number： 4000566888
After-sales E-mail ： twcustomerservice01@tongwei.com

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