The temperature coefficient in PV refers to the change in the output power of a photovoltaic (PV) module or cell as the temperature changes. It is usually expressed as a percentage change in power output per degree Celsius. For example, a PV module with a temperature coefficient of -0.5%/°C will have a 0.5% decrease in power output for every 1°C increase in temperature. The temperature coefficient can vary depending on the type of PV technology used and the materials used in the module or cell.
Heterojunction (HJT) technology is a type of PV technology that uses different semiconductor materials in the same solar cell to improve performance and efficiency. HJT cells typically consist of a thin layer of amorphous silicon (a-Si) or microcrystalline silicon (µc-Si) on top of a crystalline silicon (c-Si) substrate.
HJT cells have a lower temperature coefficient than traditional c-Si cells because the thin layer of a-Si or µc-Si on top of the c-Si substrate acts as a buffer, reducing the impact of temperature changes on the output power of the cell.
Heterojunction technology has been found to have a temperature coefficient of -0.2% to -0.3% per degree Celsius (Mysolar 700W modules have 0,26%), which is significantly lower than the -0.4% to -0.5% per degree Celsius typically seen in traditional c-Si cells.
This makes HJT technology a more attractive option for PV systems that will be exposed to high temperatures, as they will experience less performance degradation due to temperature changes.
Temperature Coefficient (α) = (ΔP/P) / (ΔT) α = [(98-100)/100] / (50-25) = -0.02 / 25 = -0.0008 or -0.08%/°C
It’s important to note that this is just an example and the temperature coefficient can vary depending on the solar panel and its technology.
Also, it’s important to measure power output under standard test conditions (STC) which are: Irradiance of 1000W/m², Air mass of 1.5, and Cell temperature of 25°C.
It’s also worth noting that the temperature coefficient of a solar panel can change over time, due to factors such as aging or environmental conditions, so it’s important to regularly measure and track the temperature coefficient of a solar panel to ensure that it is operating within its optimal temperature range.
The pattern for determining the temperature coefficient of a solar panel is to measure the change in power output of the panel as the temperature changes. The process typically involves the following steps:
It’s important to note that this pattern is a general one, it is always recommended to follow the manufacturer’s instructions to get the accurate temperature coefficient, as well as taking into consideration the measurement standards that were used.
The temperature coefficient is important in hot climate installations because it affects the performance and efficiency of a solar panel. As temperature increases, the output power of a solar panel decreases, which can result in a significant reduction in the overall performance of a solar PV system.
In hot climates, solar panels are exposed to high temperatures for long periods of time, which can cause the temperature coefficient to have a greater impact on the performance of the system. This is because the temperature coefficient becomes more negative as the temperature increases, which means that the power output of the solar panel decreases at a faster rate as the temperature rises.
For example, a solar panel with a temperature coefficient of -0.5%/°C at 25°C may have a temperature coefficient of -0.8%/°C at 50°C. This means that the power output of the solar panel decreases by 0.8% for every 1°C increase in temperature, which can result in a significant reduction in the overall performance of the system.
In addition to this, in hot climates, it’s also important to take steps to keep solar panels cool, such as shading or using a cooling system, to ensure that the solar panel is operating within its optimal temperature range, which improves the overall performance of the system.
Therefore, understanding the temperature coefficient of a solar panel is critical when installing PV systems in hot climates to ensure that the system is designed and optimized to perform well even under high-temperature conditions.
Long warranty for power production >30 Years
Highest Efficiency >22,8%
Low Yearly degradation, only >0,25%
Best Bifiaciality efficiency >95%
Lowest Temperature Coefficient 0,24%-026%/°C
Very low modules failure risk factor
HJT solar panels have the best efficiency in serial production. Scope of it is between 21%-22,53% with R&D plan even to 26%. N-type module has the best performance and most reliable characteristic resistance for most common fail from all over solar technology.
HJT with N-type technology solar Panels with 120 cells have a scope of power between 370W-390W and for 144 cells 425W – 470W. Newest standard 132 cells has standard 700W from Mysolar manufacturer. At the end of 2022 Power of HJT modules will achieve >500W, >600W and now >700W.
N-type technology ensures a long safe warranty for 30 years of production and 12 -30 years for a panel, depends on the producers. It’s more approx. 5 years than common PERC panels.
HJT solar panels with N-type cells are value for money solutions. Compare with standard backsheet modules, the price for Heterojunction is a little bit more. But compared with Bifacial, glass-glass solar panels, HJT is the best solution and has more advantages worth a few % higher price.
Higher power, bifaciality, efficient production under extreme conditions, combined with the world’s lowest degradation, no LID and PID effects and a double glass structure (GLASS-GLASS), allows you to generate significant savings over 30 years of use compared to PERC panels.
Glass is the best protection for the silicon cells that are the heart of the photovoltaic module. A cell is a unit that generates electricity, but it is made of a delicate material that needs to be reinforced and secured externally. For this purpose, we have a good ally in the form of solar glass, which, in addition to being transparent, is an electrical insulator.
HJT PV team is not only a trusted advisor but solar panels broker. We are helping Clients from all over the world connect to trusted and checked HJT producers. Direct cooperation ensures the best prices and fast delivery, to all destinations.