Photovoltaic Glass

What Is Photovoltaic Glass

Photovoltaic glass is environmentally friendly and a high-tech glass products for construction, can use solar radiation to generate electricity. Photovoltaic Glass is composed of glass, CdTe cell film, PVB and special metal wires. It is a kind of power generation glass which uses photovoltaic effect of CdTe semiconductor interface to convert light energy directly into electricity so that buildings can greatly improve their energy efficiency and reduce carbon footprint. Photovoltaic glass also has heat insulation and sound insulation properties.

 

Photovoltaic Glass


It’s a new material interlayer of Cadmium Telluride(CdTe) Thin Film Solar Cell, is a kind of special glass that can use solar radiation to generate electricity by laminating into solar cells, and has related current extraction devices and cables. It’s a technology that uses the photovoltaic effect of the semiconductor interface to directly convert light energy into electrical energy.

For Building Integrated Photovoltaic, it’s also easier to realize a truly sustainable building because the CdTe film has better absorption of the full spectrum, and its power generation performance is significantly better than traditional crystalline silicon cells under low light conditions such as early morning and evening. The use of CdTe thin film photovoltaic power generation glass as a building component not only has the beauty of ordinary translucent roof and curtain wall, as well as the function of heat insulation, but also can generate tens of thousands of kilowatt-hours of electricity each year, which is a real realization from passive energy saving to active power generation.

If you are looking for a power source for a building as well as a house, then Photovoltaic Power Generation Glass might be quite helpful for you.
 
 

Advantage of Photovoltaic Glass

• High Light Transmittance, Strong Pressure Resistance

Photovoltaic glass generates free and clean electricity thanks to the sun, turning buildings into vertical power generators. The tempered glass has higher strength, which can withstand greater wind pressure and greater temperature changes between day and night.

• CdTe Cell Film, Weak Light Can Still Power

CdTe closely matches the solar spectrum and is most suitable for photoelectric energy conversion. It is a thin-film solar cell based on the heterojunction of p-type CdTe and n-type Cd. It has high theoretical conversion efficiency. 

• New Energy Building, ECO Preferred Choice

As green building materials, photovoltaic glass can enjoy long-term energy saving. With some local authrity strongly supports the development of building integrated photovoltaics for solar electrical power generation and has introduced some supportive policy measures, it is a useful way of the new energy continuously promoting.

• Waterproof, Heat Insulation, Decoration

Since the photovoltaic glass is equipped with CdTe cell film, it has a higher level of waterproof coefficient. Photovoltaic glass, also has strong filtering capacities, whose sunlight absorption rate more than 95%. In addition, Customers can choose the shape, color, size, thickness, optical requirements and transparency level of the glass to promote its integration in numerous projects and designs, with Low-E coating or Digital Printing process for composite structures of photovoltaic glass.


 

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Application of Photovoltaic Glass


As "green building" materials, Photovoltaic Glass is widely used in building curtain walls, building façade, photovoltaic roofs, shading, fence, solar power generation systems and other fields.

Photovoltaic Glass can be used in the solar power system in traditional industrial power stations, commercial and industrial buildings, and glass forming houses. As the material on the building surface, it can be used for building curtain walls, sunshade components (sun blinds, decorative shutters), building lighting roofs, sunshades, and building fences. In the automotive sector, photovoltaic glass can be used to auto-management of parking lot system and its sun shielding on the roof and bus platforms.

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All you need to do is to contact us via our contact form and get a quote from our highly cooperative team there.

 

About BIPV system and its features

Building integrated photovoltaic (BI-PV) refers to a technology for integrating solar power generation products into buildings to achieve a good combination of the outer surface of building envelope to provide power. BIPV is a new concept of applying solar power generation, which can be divided into the combination of photovoltaic array and building, and the integration of photovoltaic array and building. Photovoltaic module appeared in building material, and the photovoltaic array becomes an integral part of the building, mainly include photovoltaic tile roofs, photovoltaic curtain walls, and photovoltaic roofs. Attach the photovoltaic array to the building, and the building acts as a support for the photovoltaic array.

The further combination of building and photovoltaic is to integrate photovoltaic devices with building materials.

The photovoltaic system, combined with the building, can be used as an stand-alone power source or connected to the grid. Install the photovoltaic modules on the roof or exterior wall of the building, and connect the output terminal to the public grid through the controller, which constitutes a grid-connected photovoltaic system.
 
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Digital printed process can shading and prominent adornment effect. Or give a thought to Ceramic firt process. 
 
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Basic model for non-transparency is suitable for building roof or like this not need decoration and achieve maximum power generation efficiency.
 
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Recommandation: Transparency for 10%, 20%, 50%, if you may have optical paranmeter requirement, we suggest that it could be with Low-E coating film, good shading effect with hight visible light.
 

Advantage of BIPV

• Aesthetics

BIPV aims to integrate photovoltaic square arrays made of PV glass into the building's design, reducing the need for internal blinds, thereby achieving an ideal combination of aesthetics and performance.

• Reliability

BIPV uses mature crystalline silicon PV cell technology to improve the entire photovoltaic system's quality and enhance durability and performance.

• Energy Saving

The photovoltaic array itself is a battery that collects sunlight to generate electricity, which has the advantages of energy conservation and consumption reduction, can maximize energy utilization.

• Low Maintenance Cost

The photovoltaic system's working life is 25 years, and the module power begins to attenuate by 2% in the second year. However, under the standard test conditions (1000W/㎡, AM1.5, 25℃), the module's peak power is 100Wp. After 25 years, if the components without damage, the module will not be less than 86Wp under the same test conditions, which means that the power attenuation will not exceed 14%. So, it is no need to replace the components without damage in 25 years.

 

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Photovoltaic System Components


The grid-connected photovoltaic system is the photovoltaic system connected to the public grid. It is composed of a photovoltaic array, photovoltaic connecting box, grid-connected inverter, transformer, Battery and Charging control device (limited to systems with energy storage devices), and electric energy meters.

The photovoltaic array is the DC power generation unit composed of several photovoltaic modules or photovoltaic components assembled in a certain way mechanically and electrically and with a fixed supporting structure.

The grid-connected inverter is a device that converts the DC from the CdTe cell film array into an AC that meets the power grid's requirements.
 

 

How to choose a system design

Grid-connected photovoltaic systems are suitable for alternating current systems. The countercurrent grid-connected system with an energy storage device is suitable for areas that the local power supply is unreliable. The user can select whether to install energy storage devices according to the local power supply's reliability.

The stand-alone photovoltaic system is suitable for remote areas without a power grid and is irreversible. The user can choose the DC system or the AC system according to the current local system. It is recommended for remote areas without power grids requiring high power supply continuity to choose an stand-alone photovoltaic system with energy storage devices.

 

Precautions for Grid-connected Photovoltaic System

• Component Selection

When the photovoltaic system is connected to the public grid, an independent control room should be set up for medium or large photovoltaic systems. The room should be equipped with power distribution cabinets, instrument cabinets, grid-connected inverters, monitors, batteries (limited to systems with energy storage devices).

In addition to determining the module type, the installation environment and the maximum installed capacity of the photovoltaic system, the selection of the photovoltaic array should also be based on the rated DC voltage of the grid-connected inverter, the maximum power tracking control range, the maximum output working voltage of the photovoltaic module and its temperature. The coefficient determines the number of photovoltaic modules connected in series (Photovoltaic Module String). According to the total installed capacity and the photovoltaic module string's capacity to determine the number of parallel photovoltaic module strings.

The number of grid-connected inverters should be determined according to the photovoltaic system's installed capacity and the rated capacity of a single grid-connected inverter.

• Installation and Protection

The selection and design of photovoltaic modules or photovoltaic arrays should be combined with buildings. Under the careful consideration of power generation efficiency, power generation, electrical and structural safety, applicability, and beauty, it is recommended that photovoltaic components be selected first. The photovoltaic components should be coordinated with the building module to meet the installation, cleaning, maintenance, and partial replacement requirements.

The power transmission, distribution and control cables of the solar photovoltaic system shall be arranged in an overall arrangement with other pipelines. It shall be arranged in a safe, concealed and centralized manner to meet installation and maintenance requirements.

The busbar and lightning protection device should be installed in the photovoltaic connecting box. Each photovoltaic module string should be led to the busbar by a cable. A DC sub-switch should be installed in front of the busbar, and a DC main switch should be installed. Besides, the photovoltaic connecting box's location should be convenient for operation and maintenance. If photovoltaic connecting boxes are installed outdoors, waterproof and anti-corrosion measures should be taken, and their protection level should not be lower than IP65.

For selecting the DC line, its withstand voltage rating should be higher than 1.25 times the maximum output voltage of the photovoltaic array. The rated current carrying capacity should be higher than the setting value of the short-circuit protection appliance. The short-circuit protection appliance's setting value should be higher than 1.25 times the nominal short-circuit current of the photovoltaic array.

When installing photovoltaic modules on a flat roof, waterproof casings should be pre-embedded where the lead wires of the photovoltaic modules pass through the flat roof, and waterproof and sealed. When installing photovoltaic modules on a sloping roof, the connection between the building material-type photovoltaic components and the surrounding roofing materials should be well constructed. It should meet the overall thermal insulation and waterproofing requirements of the roof.


 

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Grand Glass Service


China Grand Glass has been dedicated to the engineering glass deep-processing for 27 years, which also has enjoyed great popularity in China and has offices and representatives in major cities and towns. Grand Glass has mature glass deep-processing technology, which can process different glass to produce composite building glass materials that meet customer requirements. Grand Glass and Zhongshan Ruike New Energy Co., Ltd. have formed a strategic partnership in the development of photovoltaic power generation glass. We will customize photovoltaic glass products according to customer needs, and providing professional solutions. For example, we recommend digital printed photovoltaic glass that you may want to custom patterns and design in features that add value to the aesthetic part. If you need a photovoltaic array with better sound insulation and heat insulation, you may need a composite of Low-E coated insulating  photovoltaic glass.

To implement the concept of scientific development, Grand Glass recommends that our photovoltaic glass with Low-E coating which has lower thermal conductivity and higher visible light transmittance, can effectively achieve the purpose of energy conservation and emission reduction, it will be also helpful to the development of “low-carbon economy”. We’ll be pleased to send samples, catalogs as well as detailed information.

 

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The following is the service process of Grand Glass:


➀ Inquiry and provide the basic information of project name and location, glass configuration and estimated use quantity. Then make a quotation.
➁ If you are in doubt, you should seek professional advice about the glass configuration from Grand Glass. 
➂ After confirmed the glass configuration, we could provide regular samples or customized samples.
④ Business negotiation and contract.
⑤ Payment.
⑥ Processing and production.
⑦ Delivery and follow-up service

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Thermal & electrical performance parameters of CdTe photovoltaic modules
Glass Configuration of Standard Size(1200mm*600mm) Visible Light Transmittance(%) Visible Light Reflectance(%) Shading Coefficient(%) Heat Transfer Coefficient(W/㎡k) Rated Power(Wp) Peak Voltage(V) Peak Current(A) Open Circuit Voltage(V) Short Circuit Current(A) Conversion Efficiency(%) Range of Working Temperature(℃) Power Temperature Coefficient(%/℃) Decay Rate(%) Power Area Ratio(W/M2
First Year 25 Years
3.2mm CdTe power generation glass +0.5mm EVA +3.2mm clear tempered glass  0 7 0.27 5.11 100 94.3 1.06 121.7 1.23 13.9 -40~85 -0.28 2% 14% 139
105 96.1 1.09 123.5 1.23 14.6 -40~85 -0.28 2% 14% 146
110 98 1.12 124.4 1.24 15.3 -40~85 -0.28 2% 14% 153
115 101.8 1.13 124.8 1.25 16.0 -40~85 -0.28 2% 14% 160
3.2mm CdTe power generation glass +1.14mm PVB +5mm clear tempered glass  0 7 0.27 5.03 100 94.3 1.06 121.7 1.23 13.9 -40~85 -0.28 2% 14% 139
3.2mm CdTe power generation glass(10% transmittance) +1.14mm PVB +5mm clear tempered glass  8 8 0.32 5.03 90 94.3 0.95 121.7 1.1 12.5 -40~85 -0.28 2% 14% 125
3.2mm CdTe power generation glass(20% transmittance) +1.14mm PVB +5mm clear tempered glass  16 8 0.39 5.03 80 94.3 0.85 121.7 0.98 11.1 -40~85 -0.28 2% 14% 111
3.2mm CdTe power generation glass(30% transmittance) +1.14mm PVB +5mm clear tempered glass  24 9 0.46 5.03 70 94.3 0.74 121.7 0.86 9.7 -40~85 -0.28 2% 14% 97
6mm low iron glass+ 1.52mm PVB+ 3.2mm CdTe power generation glass+1.52mm PVB+6mm low iron glass 0 7 0.27 4.79 96 95 1.01 119 1.17 13.3 -40~85 -0.28 2% 14% 133
6mm low iron glass+ 1.52mm PVB+ 3.2mm CdTe power generation glass(10% transmittance)+1.52mm PVB+6mm low iron glass 8 8 0.32 4.79 86.4 95 0.91 119 1.06 12.0 -40~85 -0.28 2% 14% 120
6mm low iron glass+ 1.52mm PVB+ 3.2mm CdTe power generation glass(20% transmittance)+1.52mm PVB+6mm low iron glass 16 8 0.39 4.79 76.8 95 0.81 119 0.94 10.7 -40~85 -0.28 2% 14% 107
6mm low iron glass+ 1.52mm PVB+ 3.2mm CdTe power generation glass(30% transmittance)+1.52mm PVB+6mm low iron glass 24 9 0.46 4.79 67.2 95 0.71 119 0.82 9.3 -40~85 -0.28 2% 14% 93
Note: All the above data were calculated by Glazing Design 1.3 under the condition of JGJ/T151-2008 standard, for your reference.
 

FAQ

Q: What is the life span of the photovoltaic system? How much essential maintenance must be evaluated? 
A: The operating life of the photovoltaic system is 25 years. The household system is inspected once or twice a year, mainly to check whether the circuit is damaged to ensure the system's safety and normal operation.

Q: How long does it take to change?
A: Generally, the components do not need to be replaced if they are not damaged in 25 years. The system will still be operational after 25 years, and the replacement depends on the customer's wishes.

Q: Will hardware devices of photovoltaic system occupy a lot of space?
A: It depends on the specific project, the main area is photovoltaic array. Under normal conditions, the entire system equipment is placed as centralized as possible to save costs, and the equipment installation location can be determined according to the project site. Inverter electric boxes, etc. can generally be wall-monted, and equipment can be mounted on walls or prefabricated brackets in idle locations which may be not necessary to add equipment rooms. Besides, if some projects only need one or two inverters and one junction box, there is no need to set up a machine room. Inverters and DC parts can be placed next to the photovoltaic array or other free locations. The grid-connected box/cabinet is generally placed near the grid-connection point or in the electric room. For commercial buildings or factories, etc., the devices can be placed as long as the electrical room has a place. However, we will be pleasured to share our professional advices with you.

Q: How do I choose the installed capacity of the photovoltaic system?
A: Solar photovoltaic systems can be divided into the following three systems according to the installed capacity of the system:
1.1 Small system, a system with installed capacity not greater than 20kW;
1.2 Medium-sized systems, systems with installed capacity between 20kW and 100kW;
1.3 Large systems, systems with installed capacity greater than 100kW.

Grand Glass will provide you with the customized solutions according to the actual needs of customers and projects, and strive for a satisfactory result.
 
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More information for Photovoltaic Glass 

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