Solar cells are devices that directly convert light energy into electricity through the photoelectric effect or photochemical effect, with crystalline silicon solar cells working in the photovoltaic effect being the mainstream. The quality of solar panel components will be directly related to the use of energy efficiency, how to buy solar panels troubled some people. Today will briefly introduce the knowledge about solar panel purchase.
1. Commonly used cell module types and conversion efficiency comparison
Currently on the market solar cells are divided into amorphous silicon and crystalline silicon. Among them, crystalline silicon can be divided into polycrystalline silicon and monocrystalline silicon, non-crystalline silicon components are mainly thin film components. The photoelectric conversion efficiency of the three materials is: monocrystalline silicon (up to 18% or more) > polycrystalline silicon (about 16%) > amorphous silicon (8%-10%). Compared with crystalline silicon components, the main problem of thin-film solar modules is the low photoelectric conversion efficiency, to convert the equivalent amount of electricity required for the module area is huge, and there is the disadvantage of poor stability. So a comprehensive view, it is appropriate to use monocrystalline silicon or polycrystalline silicon solar cell materials, the current market mainstream is monocrystalline silicon. It is recommended that you choose monocrystalline silicon panels with higher conversion efficiency.
When we buy solar cells, the focus of attention is the power of solar cells, generally speaking, the power of solar panels is proportional to the area of the solar wafer. The area of the solar cell wafer is not exactly equal to the area of the solar package panel, because some solar panels, although large, single solar wafers are arranged with wide gaps, so the solar panel power is not necessarily high.
2. Solar cell battery capacity selection
After the installation of photovoltaic off-grid system, because the solar photovoltaic power generation system input energy is extremely unstable, so generally need to configure the battery system to work. Solar lamps and lanterns are no exception, must be configured to work with batteries. Battery capacity selection generally follows the following principles: first of all, to meet the premise of night lighting, to store the energy of the solar modules during the day as much as possible, but also to store to meet the continuous rainy days and night lighting needs of electricity. Battery capacity is too small to meet the needs of night lighting, battery capacity is too large, on the one hand, the battery is always in a state of power loss, affecting battery life, while causing waste.
The battery is essential in the off-grid system, the solar panel through the controller to charge the storage battery, the storage battery through the off-grid inverter output for user use, storage battery in the PV off-grid system is more commonly used in lead-acid colloidal batteries, lithium ternary batteries and lithium iron phosphate batteries. The average life of energy storage batteries is 5-8 years, and they need to be replaced regularly, so the cost of use is higher. You can choose a grid-connected PV system by clicking on "Household PV: The difference between off-grid and grid-connected" (link to article on grid-connected off-grid) to learn more. Current electricity prices are high, it is recommended that grid-connected systems also support the corresponding energy storage system to use cheap solar power more efficiently.
3. Solar cell power selection
The solar cell output power Wp we are talking about is the output power of solar cells under standard solar lighting conditions, i.e.: 101 standard as defined by the European Commission, radiation intensity 1000W/㎡, atmospheric mass AM1.5, and cell temperature 25℃ conditions. This is not the rated output power as long as there is sunlight, as some people think, or even think that solar cells can be used normally under daylight at night. This means that the output power of solar cells is random, and the output power of the same solar cell is different at different times and in different locations. The actual power generated can be referred to the data under non-standard solar irradiation conditions, and you can determine the appropriate power to choose based on your own daily power consumption and roof area.
It's a good idea to choose Maysun Solar when winter is approaching. We have quality solar panels to meet your needs, such as our TwiSun series of double-glass modules (product link) with higher conversion rates and better appearance.
We are a module manufacturer founded in 2008 and with a lot of professional experience. If you are interested in learning more about photovoltaics, we are here to help you with whatever you need. Contact us now and get a quote. Trust us, it's worth it!