Solar panel in the market look the same . How to choose a suitable solar module ?
Price may be the primary consideration in comparison, but cost is determined by power, size, brand, quality, durability, certification, and so on. In the long term, the cheapest components may not be the most reliable to use. So there's a lot more to consider than just the price.
Type of the module : monocrystal ， polycrystal or thin film ?
Price of the monocrystal module is higher ;
Efficiency of polycrystal module is moderate, relatively less expensive;
Thin film modules are good transparency, shielding effect, fashion appearance,but the price is not cheap. Also on the market building integration modules, with black frame components, high aesthetics; salt and Alkali Resistance, strong wind modules are suitable for special situation.
2.How to check the level of solar module ?
In the production process of pv module, in order to ensure its power generation performance, there will be strict ex-factory inspection, the domestic manufacturers will components according to performance and appearance is divided into A, B, c three grades. Class A components have excellent performance, generally refers to high efficiency, good electrical performance, life of at least 25 years, according to their different products, can be divided into A1, A2, A3 levels. The efficiency of Class B module is lower than that of class a module, which usually has some defects and serious color difference. The battery of Class C module often has physical damage, such as corner defect, edge collapse, broken gate and so on. B, C components because of the existence of defects and quality problems, can not guarantee the follow-up power and attenuation rate. (There are slight differences in the criteria used to classify the different grades.)
3.Efficiency of modules
The efficiency of a solar module is the degree which the light energy received is converted into electrical energy, and the amount of electricity generated by the system. The better efficient ,the more expensive it is, you can evaluate your power usage and choose the right component.
4. Temperature Coefficient, "module aging. "
The temperature coefficient refers to the efficiency of the solar module after installation. The lower the temperature coefficient percentage, the better, because the solar module1`s overheat and accelerate will speed up its aging.
5.The decay of modules
We often say that 310W pv module, the strict meaning is 310Wp, p represents peak, indicating its peak power is 310W, Test Condition is STC Standard Test Condition: irradiance is 1000W / M2, battery temperature is 25 °C, am 1.5 °C. In other words, the 310Wp components represent 310w of the power generated under STC. This parameter decreases as the component ages.
Typically, solar panels have a 25-year power generation guarantee, and if manufacturers do not provide long-term guarantees, their products may not be of very good quality, in this case, please be careful not to be misled by the attractive low price.
6.After understanding these, when the user selecting the pv module , they should find the right PV module for their own power station according to their own actual situation.