custom solar panel – 第 3 页

What is an Amorphous Solar Panel?

An amorphous solar panel is a type of thin-film solar panel made from amorphous silicon (a-Si), a non-crystalline form of silicon. Unlike traditional crystalline silicon solar panels (monocrystalline or polycrystalline), which have a structured, lattice-like arrangement of silicon atoms, amorphous silicon lacks this ordered structure. This gives it unique properties and applications.

Key Features of Amorphous Solar Panels:

1. Flexibility and Thinness:

– Amorphous solar panels are extremely thin and lightweight, making them flexible and adaptable to various surfaces.

– They can be applied to curved or irregular surfaces, unlike rigid crystalline panels.

2. Manufacturing Process:

– Amorphous silicon is deposited in thin layers onto substrates like glass, plastic, or metal using a process called chemical vapor deposition (CVD).

– This process is less energy-intensive and cheaper compared to producing crystalline silicon.

3. Efficiency:

– Amorphous solar panels typically have lower efficiency (around 6-10%) compared to crystalline panels (15-25%).

– However, they perform better in low-light conditions (e.g., cloudy days or indirect sunlight) and high temperatures.

4. Cost:

– They are generally cheaper to produce due to the lower amount of silicon required and simpler manufacturing processes.

5. Durability:

– Amorphous panels are less prone to cracking or damage because of their flexible nature.

– However, they may degrade faster over time compared to crystalline panels (a phenomenon called the **Staebler-Wronski effect**).

6. Applications:

– Used in small-scale applications like solar-powered calculators, watches, and portable chargers.

– Ideal for building-integrated photovoltaics (BIPV), such as solar windows or roofing materials.

– Suitable for large-scale installations where lightweight and flexible panels are needed.

Advantages:

– Better performance in low-light and high-temperature conditions.

– Lightweight and flexible, enabling unique applications.

– Lower production costs.

Disadvantages:

– Lower efficiency compared to crystalline panels.

– Shorter lifespan and potential degradation over time.

– Requires more space to generate the same amount of power as crystalline panels.

In summary, amorphous solar panels are a versatile and cost-effective option for specific applications, particularly where flexibility, lightweight design, or performance in challenging conditions is needed. However, they are less efficient and durable than traditional crystalline silicon panels.

Posted by Carrie Wong / WSL Solar

WSL Solar has been a quality and professional manufacturer of custom solar panels, solar mini panels, IoT solar panels and solar solution provider in China since 2006.

https://www.wsl-solar.com

What is the Difference Between Crystalline Silicon Solar Panel and Amorphous Silicon Solar Panel?

Crystalline silicon solar panels and amorphous silicon solar panels are two distinct types of photovoltaic technologies, differing in their structure, efficiency, cost, and applications.

Crystalline Silicon Solar Panel

Amorphous Silicon Solar Panel

Here’s a breakdown of the key differences:

1. Structure and Composition

– Crystalline Silicon Solar Panels:

– Made from silicon atoms arranged in a highly ordered, crystalline structure.

– Two main types:

– Monocrystalline Silicon**: Made from a single crystal structure, giving it a uniform appearance and high efficiency.

– Polycrystalline Silicon**: Made from multiple silicon crystals, resulting in a less uniform appearance and slightly lower efficiency.

– Amorphous Silicon Solar Panels:

– Made from non-crystalline (amorphous) silicon, where atoms are arranged in a disordered, random structure.

– Typically deposited as a thin film on substrates like glass, metal, or plastic.

2. Efficiency

– Crystalline Silicon:

– Higher efficiency due to the ordered structure, which allows for better electron movement.

– Monocrystalline panels: ~20-23% efficiency.

– Polycrystalline panels: ~18-20% efficiency.

– Amorphous Silicon:

– Lower efficiency due to the disordered structure, which hinders electron movement.

– Typically ~6-10% efficiency.

3. Cost

– Crystalline Silicon:

– Generally more expensive to produce due to the energy-intensive manufacturing process and high-purity silicon requirements.

– Amorphous Silicon:

– Cheaper to produce because it uses less silicon and can be manufactured using simpler processes like thin-film deposition.

4. Flexibility and Applications

– Crystalline Silicon:

– Rigid and heavy, making them suitable for traditional rooftop installations and large-scale solar farms.

– Amorphous Silicon:

– Lightweight and flexible, enabling use in unconventional applications like curved surfaces, portable devices, and building-integrated photovoltaics (BIPV).

5. Performance in Low Light and High Temperatures

– Crystalline Silicon:

– Performs better under standard test conditions but can lose efficiency in high temperatures.

– Amorphous Silicon:

– Performs better in low-light conditions (e.g., cloudy weather) and is less affected by high temperatures.

6. Lifespan and Durability

– Crystalline Silicon:

– Longer lifespan (25-30 years or more) and higher durability.

– Amorphous Silicon:

– Shorter lifespan and may degrade faster over time (e.g., due to light-induced degradation).

7. Aesthetic Appeal

– Crystalline Silicon:

– Monocrystalline panels have a sleek, black appearance, while polycrystalline panels have a blue, speckled look.

– Amorphous Silicon:

– Thin-film panels have a uniform, dark appearance and can be integrated into building materials for a more aesthetic look.

Summary Table:

Feature	Crystalline Silicon	Amorphous Silicon
Structure	Ordered crystal structure	Disordered, random structure
Efficiency	18-23%	6-10%
Cost	Higher	Lower
Flexibility	Rigid	Flexible
Applications	Rooftops, solar farms	BIPV, portable devices
Low-Light Performance	Moderate	Better
Lifespan	25-30+ years	Shorter
Aesthetic	Sleek black(mono) or blue speckled (poly)	Uniform, dark appearance

In summary, crystalline silicon panels are more efficient and durable but costlier, while amorphous silicon panels are cheaper, flexible, and better suited for specific applications like BIPV or portable devices. The choice depends on the specific needs and constraints of the project.

Posted by Carrie Wong / WSL Solar

WSL Solar has been a quality and professional manufacturer of custom solar panels, solar mini panels, IoT solar panels and solar solution provider in China since 2006.

https://www.wsl-solar.com

How to Choose a Custom Solar Panel for an IoT Device?

Choosing a custom solar panel for an IoT device involves several considerations to ensure optimal performance, efficiency, and compatibility. Here’s a step-by-step guide to help you select the right solar panel:

1. Determine Power Requirements

Calculate Energy Consumption: Measure the power consumption of your IoT device in watts or milliwatts (mW). Consider both active and sleep modes.
Daily Energy Needs: Estimate the total energy required per day (watt-hours, Wh) by multiplying the power consumption by the number of hours the device operates.
Battery Storage: If your device uses a battery, determine the battery capacity and how much energy the solar panel needs to recharge it daily.

2. Assess Sunlight Availability

Location: Consider the geographic location where the IoT device will be deployed. Areas with more sunlight will require smaller panels compared to regions with less sunlight.
Sunlight Hours: Determine the average peak sunlight hours per day for the location. This will help in sizing the solar panel correctly.

3. Select Solar Panel Type

Monocrystalline: High efficiency and space-efficient, ideal for small IoT devices.
Polycrystalline: Slightly less efficient but more cost-effective.
Thin-Film: Flexible and lightweight, suitable for unconventional surfaces but generally less efficient.

4. Determine Panel Size and Output

Power Output: Ensure the solar panel can generate enough power to meet the daily energy needs of your IoT device. Use the formula:
[
\text{Panel Size (W)} = \frac{\text{Daily Energy Needs (Wh)}}{\text{Peak Sunlight Hours}}
]
Physical Size: Consider the physical dimensions of the solar panel to ensure it fits within the design constraints of your IoT device.

5. Voltage and Current Requirements

Voltage Matching: Ensure the solar panel’s voltage output matches the input requirements of your IoT device or charge controller.
Current Output: The panel should provide sufficient current to charge the battery or power the device directly.

6. Efficiency and Durability

Efficiency: Higher efficiency panels generate more power per unit area, which is crucial for compact IoT devices.
Durability: Choose panels with robust construction to withstand environmental conditions like temperature fluctuations, humidity, and mechanical stress.

7. Integration with Power Management

Charge Controller: If using a battery, ensure the solar panel is compatible with a charge controller to regulate charging and prevent overcharging.
Power Management IC: For direct powering, ensure the solar panel’s output is compatible with the device’s power management IC.

8. Customization Options

Shape and Size: Custom solar panels can be tailored to fit specific dimensions and shapes required by your IoT device.
Connectors and Mounting: Ensure the panel has the appropriate connectors and mounting options for easy integration.

9. Cost and Supplier Reliability

Budget: Balance the cost with the performance and durability requirements.
Supplier: Choose a reputable supplier with experience in custom solar panels for IoT applications.

10. Testing and Validation

Prototype Testing: Test the solar panel with your IoT device in real-world conditions to validate performance.
Long-term Reliability: Ensure the panel can maintain performance over the expected lifespan of the IoT device.

By carefully considering these factors, you can select a custom solar panel that effectively powers your IoT device, ensuring reliable and sustainable operation.

Posted by Carrie Wong / WSL Solar

WSL Solar has been a quality and professional manufacturer of custom solar panels, solar mini panels, IoT solar panels and solar solution provider in China since 2006.

https://www.wsl-solar.com

What is an ETFE Solar Panel?

An ETFE solar panel is a type of solar panel that uses Ethylene Tetrafluoroethylene (ETFE) as a protective layer or encapsulant for the photovoltaic (PV) cells. ETFE is a fluorine-based plastic known for its high light transmission, durability, and resistance to environmental factors such as UV radiation, extreme temperatures, and chemical corrosion. Here’s a breakdown of its features and benefits:

Key Features of ETFE Solar Panels:

High Light Transmission: ETFE allows up to 95% of light to pass through, making it highly efficient for solar energy capture.
Durability: ETFE is extremely strong and can withstand harsh weather conditions, including hail, heavy rain, and snow.
Lightweight: ETFE is much lighter than glass, reducing the overall weight of the solar panel and making it easier to install.
Self-Cleaning Properties: ETFE has a non-stick surface that repels dust and dirt, reducing maintenance needs.
UV Resistance: ETFE is highly resistant to UV degradation, ensuring long-term performance.
Flexibility: ETFE can be used in flexible solar panels, enabling innovative applications like curved surfaces or portable solar solutions.

Applications:

Building-Integrated Photovoltaics (BIPV): ETFE solar panels are often used in architectural designs, such as solar facades, skylights, or roofs, due to their aesthetic appeal and transparency.
Portable Solar Devices: Their lightweight and flexibility make them ideal for portable solar chargers or foldable solar panels.
Greenhouses: ETFE panels are used in agricultural settings to allow sunlight to penetrate while generating solar energy.

Advantages Over Traditional Solar Panels:

Better Aesthetics: ETFE panels can be designed to be semi-transparent or colored, blending seamlessly into building designs.
Improved Efficiency: The high light transmission and self-cleaning properties help maintain optimal energy output over time.

Challenges:

Cost: ETFE is more expensive than traditional materials like glass or EVA, which can increase the overall cost of the solar panel.
Specialized Manufacturing: Producing ETFE solar panels requires specialized equipment and processes.

In summary, ETFE solar panels are a high-performance, durable, and versatile option for solar energy generation, particularly suited for applications where weight, flexibility, and aesthetics are important considerations.

Posted by Carrie Wong from WSL Solar

WSL Solar has been a quality and professional manufacturer of custom solar panels, solar mini panels, IoT solar panels and solar solution provider in China since 2006.

https://www.wsl-solar.com

How to Choose a Custom Solar Panel for IoT Device?

Choosing a custom solar panel for an IoT device involves a comprehensive evaluation of various factors related to the device’s power requirements, environmental conditions, and the solar panel’s specifications. Here is a detailed guide to assist you in making an informed decision.

Understanding Power Requirements

Determining the power requirements of your IoT device is critical. This involves assessing the device’s functions, such as data processing, acquisition, transmission, and user interaction. It’s essential to measure the current draw in different operational states, including active and sleep modes, to estimate total power consumption. This understanding will help you calculate the required power output of the solar panel to ensure uninterrupted operation.

Assessing Environmental Conditions

The solar panel’s performance is significantly influenced by the environmental conditions in which it will operate. Consider the availability of light, both natural and artificial, as this will affect the solar panel’s energy harvesting capability. It’s essential to evaluate the sunlight exposure at the location of installation, determining the average hours of sunlight per day, and accounting for potential obstructions or shading that may impact performance.

Specifications of the Solar Panel

When selecting a solar panel, key specifications to consider include:

Output Voltage and Current: Ensure that the solar panel’s output voltage and current align with your IoT device’s requirements. For instance, a panel might have outputs of 4VDC, 5VDC, or 12VDC, depending on the application.

Efficiency Rating: Higher efficiency solar panels convert a greater percentage of sunlight into usable energy, which is beneficial in limited light conditions. As of 2024, solar panels typically range from 19% to 24% efficiency, with some premium options exceeding this thresholdand.

Size and Form Factor: The physical dimensions of the solar panel must suit the design and constraints of your IoT device. Custom solutions may need smaller or more uniquely shaped panels that fit within the device’s enclosure.

Durability and Environmental Rating: If the IoT device will be exposed to harsh conditions, selecting a solar panel that is weather-resistant or has an IP rating (e.g., IP67 for waterproofing) is critical.

Integration and Connectivity

Consider how the solar panel will connect to the IoT device. Look for specifications on connector types and compatibility, ensuring that the wiring can support the necessary current without loss. Furthermore, efficient energy management systems may be required to control the charging and discharging process, which includes the use of power controllers that prevent overcharging and ensure operational safety.

Cost and Return on Investment

Lastly, it is essential to evaluate the cost of the solar panel against your budget and the potential return on investment. While higher efficiency and custom features may demand a higher upfront cost, they can lead to significant savings in energy and maintenance over time. Consider the long-term benefits such as reduced reliance on traditional power sources, lower operational costs, and enhanced sustainability.

By considering these factors carefully, you can select a custom solar panel that meets the specific needs of your IoT device, ensuring efficient and reliable operation in its intended environment.

WSL Solar has been a quality and professional manufacturer of custom solar panels, solar mini panels, IoT solar panels and solar solution provider in China since 2006.

https://www.wsl-solar.com

What is the Difference between Mono Solar Panel and Poly Solar Panel?

Monocrystalline and polycrystalline solar panels are two predominant types of solar technology, each with unique characteristics that affect their efficiency, cost, appearance, and suitable applications.

Composition and Manufacturing Process
Monocrystalline solar panels are composed of a single crystal structure of silicon, which is created by placing a seed crystal in molten silicon to grow a single ingot. This process gives rise to uniform, dark-colored panels that are recognized for their purity and efficiency. On the other hand, polycrystalline solar panels are made from multiple silicon crystals that are melted together and poured into molds, leading to a less uniform appearance characterized by a bluish hue. The manufacturing process for polycrystalline panels is simpler and less expensive, which typically makes them more affordable than their monocrystalline counterparts.

Efficiency Ratings
In terms of efficiency, monocrystalline solar panels generally outperform polycrystalline panels. Monocrystalline panels achieve efficiencies ranging from 20% to over 24%, while polycrystalline panels usually have efficiencies between 18% and 20%. This difference is primarily due to the structure of the solar cells; the single crystal composition of monocrystalline panels allows electrons more freedom to move and generate electricity efficiently.

Performance in Heat
When exposed to high temperatures, monocrystalline panels tend to perform better than polycrystalline panels. They have a lower temperature coefficient, which means their efficiency decreases less drastically as temperature rises. Conversely, polycrystalline panels exhibit a higher temperature coefficient, resulting in a more significant decrease in efficiency in hot conditions.

Cost Considerations
Cost is a crucial factor for many consumers deciding between the two options. Generally, monocrystalline panels come at a higher price due to the complex manufacturing process, with costs typically ranging from $1 to $1.50 per watt before installation. In contrast, polycrystalline panels are priced more affordably, generally around $0.90 to $1 per watt. Despite the initial cost savings with polycrystalline panels, monocrystalline panels may provide better long-term savings through higher efficiency, especially in space-limited installations.

Aesthetic Differences
The visual appeal of solar panels can also influence choice. Monocrystalline panels are usually sleek and all-black, which many find more aesthetically pleasing. Conversely, polycrystalline panels have a blue hue and may appear more variegated due to their composition, which some consumers might not prefer visually.

In summary, while both monocrystalline and polycrystalline solar panels have their benefits and drawbacks, the choice often hinges on efficiency needs, budget constraints, aesthetic preferences, and roof space considerations. Monocrystalline panels are typically favored for their greater efficiency and sleek appearance, making them suitable for residential applications where space is limited. Polycrystalline panels are a more cost-effective option but may require more panels to achieve the same energy output due to their lower efficiency.

WSL Solar has been a quality and professional manufacturer of custom solar panels, solar mini panels, IoT solar panels and solar solution provider in China since 2006.

https://www.wsl-solar.com

What is a Solar Panel？

A solar panel is a device designed to convert sunlight into electricity using photovoltaic (PV) cells. These cells are typically made of semiconductor materials like silicon, which produce an electric current when exposed to sunlight.

Functionality of Solar Panels

Solar panels operate by absorbing sunlight and converting it into electricity through the photovoltaic effect. This process includes several key components: the solar cells within the panel generate direct current (DC) electricity, which can then be converted into alternating current (AC) electricity suitable for household use using an inverter. An average solar panel consists of multiple solar cells that work in unison to produce a higher voltage and current, creating a more substantial power output.

Types of Solar Panels

There are primarily two types of solar panels: monocrystalline and polycrystalline. Monocrystalline panels, made from a single crystal structure, are known for their high efficiency and performance in low-light conditions. In contrast, polycrystalline panels, formed from multiple crystal structures, tend to be less expensive but also have slightly lower efficiency rates. Thin-film solar panels are another category that utilizes layers of photovoltaic material deposited onto a substrate, which allows for a flexible form factor but often at reduced efficiency compared to crystalline panels.

Applications of Solar Panels

Solar panels have a broad range of applications. They are commonly used in residential and commercial settings to power homes and businesses. Additionally, solar panels are employed in standalone systems for remote areas, satellite systems, and even automotive applications. The versatility of solar panels makes them a suitable solution for a wide array of energy needs, including off-grid living and providing power to essential services in remote locations.

Benefits of Using Solar Panels

Utilizing solar panels offers numerous advantages, including reduced electricity costs, minimal environmental impact, and energy independence. Solar energy is renewable and does not produce greenhouse gases during operation, making it a cleaner alternative to fossil fuels. Furthermore, many government incentives, such as tax credits, encourage the adoption of solar technology by offsetting initial installation costs.

Conclusion

In summary, solar panels are essential components of modern renewable energy systems, allowing for the efficient conversion of sunlight into usable electricity. Their growing popularity is driven by advancements in technology and increasing awareness of sustainable energy practices. As solar technology continues to evolve, it is expected that the efficiency and affordability of solar panels will improve further, expanding their applications and benefits.

WSL Solar has been a quality and professional manufacturer of custom solar panels, solar mini panels, IoT solar panels and solar solution provider in China since 2006.

https://www.wsl-solar.com

What is Household Photovoltaics?

In recent years, with the improvement of people’s environmental awareness and the deepening of energy reform, coupled with the reduction of industrial chain costs and the rise of various household station construction models, more and more families have begun to consider installing photovoltaic power generation systems on their roofs. According to data from the National Energy Administration, as of the end of March 2024, China’s total household photovoltaic installed capacity will be 122.94GW. The cumulative number of installed households has exceeded 5 million.

Although household photovoltaic installations have grown rapidly in the past two years, overall, the penetration rate of household photovoltaic market is still low. According to data from Sepu Consulting, the penetration rate of household photovoltaics in 2023 is only 8%, which means that there are at least 60 million roofs to be developed. There are still many people who do not know enough about rooftop photovoltaics or have misunderstandings. Today, let’s talk about household photovoltaics.

1. What is household photovoltaics?
Household photovoltaic is a type of distributed photovoltaic, that is, by installing solar photovoltaic panels on the roof or courtyard of the house, solar energy is converted into electricity for household use, and the excess electricity is sold to the grid (self-generation and self-use, surplus electricity is connected to the grid), or the generated electricity is directly sold to the grid in full to obtain electricity fee income (full access to the grid).

2. What are the benefits of household photovoltaic?
Economic benefits: By installing household photovoltaic systems, families can use solar energy to generate electricity, reduce dependence on grid electricity, and thus reduce electricity bills. Excess electricity can also be sold to the grid for additional income.

Environmental protection and energy saving: Photovoltaic power generation is a clean energy that does not produce pollutants such as carbon dioxide. It helps to reduce carbon footprint, protect the earth’s home, do a little to slow down global warming, and leave a safer and more livable home for future generations.

Increase the utilization rate of roofs/courtyards: Roofs and courtyards usually have large vacant areas. Installing photovoltaic panels can make full use of these spaces, and increase the value per unit area without affecting normal use, that is, increase the utilization rate.

Energy independence: Photovoltaic systems enable families to achieve energy independence to a certain extent, especially in areas with unstable power supply or high electricity prices. Improving the safety and stability of electricity is of great significance to improving people’s lives.

Beautiful: Modern photovoltaic panels are beautifully designed and can be perfectly integrated with the roof to enhance the appearance of the house.

3. Precautions for installing household photovoltaics
Before deciding to install a household photovoltaic system, you need to pay attention to the following aspects:

Roof conditions: Make sure the roof structure is stable, has enough space and a good orientation, and is not blocked by trees or other buildings.

System design: According to the family’s electricity demand and roof conditions, choose the appropriate photovoltaic module array and inverter to ensure the best performance of the system.

Policy support: Understand the local power grid’s open capacity, grid connection requirements and power companies’ photovoltaic grid-connected electricity prices, etc. These policies may affect the return on investment and the benefits obtained.

Professional installation: Choose a qualified and experienced installation company to ensure the quality and safety of the system installation and avoid later maintenance and safety hazards.

4. Answers to common problems
Many families may encounter some problems during the installation and use of photovoltaic systems. The following are common problems and their answers:

1）How long is the life of a photovoltaic system?
Generally speaking, the service life of a photovoltaic panel is about 25 years, while the life of an inverter is 10 to 25 years. Regular maintenance and care can extend the service life of the system.

2）Can the photovoltaic system still generate electricity on cloudy or rainy days?
Although the power generation efficiency of the photovoltaic system will decrease on cloudy or rainy days, it can still generate a certain amount of electricity. Therefore, this situation is usually taken into account when designing the system to ensure the stability of power supply throughout the year.

In addition, some new solar cell technologies can even generate electricity at night or on rainy days. These technologies generate electricity by storing the energy of visible and near-infrared light that is not absorbed and releasing this energy at the appropriate time.

3）How much does it cost to install a photovoltaic system?
The installation cost depends on the size of the system and the choice of components. Generally speaking, the initial investment is large, and the payback period is usually around 5 to 10 years, which varies depending on the region and the system design. For details, please consult the relevant power station construction companies.

4) Is it difficult to maintain the photovoltaic system?
The maintenance of the photovoltaic system is relatively simple but highly professional. The daily work mainly involves regular cleaning of photovoltaic panels, checking the operating status of the system and handling faults. Most installation companies will provide a certain period of warranty and after-sales service.

5) Is there a radiation problem with photovoltaic power stations?
Radiation can be divided into two types: ionizing radiation and non-ionizing radiation, and ionizing radiation is harmful to the human body. Photovoltaic power generation is non-ionizing radiation. Photovoltaic power generation mainly converts solar energy into electrical energy. Compared with daily household appliances, the radiation of the photovoltaic system is negligible, so it can be installed and used with confidence.

In general, installing a photovoltaic power station on the roof not only helps save electricity bills and protect the environment, but also improves asset utilization, and has become a new “green fashion”. However, before installation, it is very necessary to fully understand the characteristics of the photovoltaic system and related precautions to ensure long-term and stable returns.

WSL Solar has been a quality and professional manufacturer of custom solar panels, solar mini panels, IoT solar panels and solar solution provider in China since 2006.

https://www.wsl-solar.com

Manufacturer of Custom Solar Panels

WSL Solar Co., Ltd. has been a Professional Manufacturer of High Quality Custom Solar Panels and Solar Solution Provider in China since 2006.

https://www.wsl-solar.com

What are the Performance Parameters and Types of Solar Panels?

The function of solar panels is to convert the sun’s light energy into electrical energy, and then output direct current to store in the battery. This is the core part of the solar photovoltaic power generation system. The quality and cost of solar panels will directly determine the quality and cost of the entire system. Today we will talk in detail about the performance parameters and types of solar panels.

Solar panel parameters

The performance parameters of solar panels mainly include: short-circuit current, open-circuit voltage, peak current, peak voltage, peak power, fill factor and conversion efficiency.

1. Short-circuit current (isc): When the positive and negative poles of the solar cell are short-circuited and u=0, the current at this time is the short-circuit current of the cell. The unit of short-circuit current is ampere (a), and the short-circuit current changes with the change of light intensity.

2. Open-circuit voltage (uoc): When the positive and negative poles of the solar cell are not connected to the load and i=0, the voltage between the positive and negative poles of the solar cell is the open-circuit voltage. The unit of open-circuit voltage is volt (v). The open circuit voltage of a single solar cell does not change with the increase or decrease of the cell area, and is generally 0.5~0.7V.

3. Peak current (im): Peak current is also called maximum operating current or optimal operating current. Peak current refers to the operating current when the solar cell outputs maximum power, and the unit of peak current is ampere (a).

4. Peak voltage (um): Peak voltage is also called maximum operating voltage or optimal operating voltage. Peak voltage refers to the operating voltage when the solar cell outputs maximum power, and the unit of peak voltage is v. Peak voltage does not change with the increase or decrease of the cell area, and is generally 0.45~0.5V, with a typical value of 0.48V.

5. Peak power (pm): Peak power is also called maximum output power or optimal output power. Peak power refers to the maximum output power of the solar cell under normal working or test conditions, that is, the product of peak current and peak voltage: pm=im×um. The unit of peak power is w (watt). The peak power of solar cells depends on the solar irradiance, solar spectrum distribution and the working temperature of the cell. Therefore, the measurement of solar cells should be carried out under standard conditions. The measurement standard is the European Commission’s Standard 101, which has the following conditions: irradiance lkw/㎡, spectrum aml.5, and test temperature 25℃.

6. Fill factor (ff): Fill factor, also called curve factor, refers to the ratio of the maximum output power of a solar cell to the product of the open circuit voltage and the short circuit current. The calculation formula is ff=pm/(isc×uoc). Fill factor is an important parameter for evaluating the output characteristics of solar cells. The higher its value, the more rectangular the output characteristics of the solar cell are, and the higher the photoelectric conversion efficiency of the cell is.

The series and parallel resistances have a great influence on the fill factor. The smaller the series resistance of the solar cell, the larger the parallel resistance, and the larger the coefficient of the fill factor. The coefficient of the fill factor is generally between 0.5 and 0.8, and can also be expressed as a percentage.

7. Conversion efficiency (η): Conversion efficiency refers to the ratio of the maximum output power of a solar cell when it is illuminated to the solar energy power irradiated on the cell. That is: η=pm (peak efficiency of the cell)/a (area of the cell) × pin (incident light power per unit area), where pin=lkw/㎡=100mw/cm2.

Types of solar panels

1. Monocrystalline silicon photovoltaic cells

The photoelectric conversion efficiency of monocrystalline silicon solar cells is about 23%, and the highest reaches 26%. This is the highest photoelectric conversion efficiency among all types of solar cells at present, but the production cost is very high, so it cannot be widely and generally used. Since monocrystalline silicon is generally encapsulated with tempered glass and waterproof resin, it is sturdy and durable, and its service life can generally reach 15 years, and up to 25 years.

2. Polycrystalline silicon photovoltaic cells

The production process of polycrystalline silicon solar cells is similar to that of monocrystalline silicon solar cells, but the photoelectric conversion efficiency of polycrystalline silicon solar cells is much lower, and its photoelectric conversion efficiency is about 20%. In terms of production cost, it is cheaper than monocrystalline silicon solar cells, the material is simple to manufacture, and it saves electricity consumption. The total production cost is low, so it has been widely developed. In addition, the service life of polycrystalline silicon solar cells is also shorter than that of monocrystalline silicon solar cells. In terms of performance-price ratio, monocrystalline silicon solar cells are slightly better.

3. Amorphous silicon photovoltaic cells

Amorphous silicon solar cells are a new type of thin-film solar cells that appeared in 1976. They are completely different from single-crystal silicon and polycrystalline silicon solar cells in terms of manufacturing method. The process is greatly simplified, silicon material consumption is very low, and power consumption is lower. Its main advantage is that it can generate electricity even under weak light conditions. However, the main problem with amorphous silicon solar cells is that the photoelectric conversion efficiency is low, about 10%, and it is not stable enough. As time goes by, its conversion efficiency decays.

4. Multi-element photovoltaic cells

Multi-element solar cells refer to solar cells that are not made of single-element semiconductor materials. There are many varieties of research in various countries, most of which have not yet been industrialized. The main ones are as follows:

1) Cadmium sulfide solar cells;
2) Gallium arsenide solar cells;
3) Copper indium selenide solar cells (new multi-element bandgap gradient Cu (In, Ga) Se2 thin film solar cells.

The above is an introduction to the performance parameters and types of solar panels. In addition, packaging is a key step in the production of solar cells. Without a good packaging process, no matter how good the battery is, it will not produce a good solar panel. The packaging of the battery can not only ensure the life of the battery, but also enhance the battery’s resistance, so the packaging quality of the solar panel is very important.

WSL Solar has been a quality and professional manufacturer of custom solar panels, solar mini panels, IoT solar panels and solar solution provider in China since 2006.

https://www.wsl-solar.com