Installation of photovoltaic systems, accessories quality is directly related to the power generation effect and use of safety. There are many types of PV accessories on the market, the price difference is large, it is difficult to distinguish good and bad just by looking at the appearance. In fact, test the quality of photovoltaic accessories have a practical approach, remember the 5 skills, buy accessories are no longer afraid of being pit.
Let’s talk about the PV cable, which is the “blood vessel” of power transmission. When choosing cables, do not buy cheap brand-name goods. Some low-priced cables although the appearance looks almost the same, but the internal copper core may be recycled copper, impurities, poor conductivity, resistance, long time will heat, not only affect the efficiency of power generation, but also may cause a fire. Reliable practice is to recognize the big brand, see whether the cable has the relevant certification, such as the national standard certification. General household photovoltaic system, according to the power selection of the appropriate wire diameter cable, such as 5 kilowatts or so of the system, choose 4 square millimeters of multi-core copper-core cable is enough, if the wire diameter is too fine current transmission is not smooth, but if it is too thick and will be a waste of money.
Photovoltaic connectors, although small, but the role can not be small. Poor quality connectors inserted and pulled a few times on the loose, sealing is poor, encountered rainy days, rainwater seepage is easy to short-circuit. Select the connector to choose a good material, such as tin-plated copper material, conductive good oxidation is not easy. Like the common MC4 connector, generally only waterproof sealing ring, insertion and extraction of a clear sense of stuttering, so that the connection is solid. When you buy, you can plug and unplug a few times to try to feel too loose or too tight are not.
Inverter can be said to be the photovoltaic system “brain”, the price is not expensive, be careful when choosing. Some small manufacturers of inverters, false parameters, the surface power is very high, the actual conversion efficiency is low, failure is also relatively easy. Choosing inverters prioritizes brands with good market reputation and after-sales protection. For example, string inverters are suitable for families, not only can they independently monitor the power generation of each string of components, a bad string will not affect other strings, and maintenance is very convenient. Also note that the input voltage range of the inverter must be matched with the PV module, otherwise it will affect the power generation effect.
Distribution box is to protect the circuit “guard”, the quality of the components inside must be qualified. Some of the distribution box circuit breaker, leakage protector with a small factory goods, the critical moment can not play a protective role. Selection of distribution boxes, open to see the brand of components inside, like Schneider, Chint components of these big brands, quality is more guaranteed. And the size of the distribution box should be selected according to the system capacity, too small to load the components, too big a waste of space and cost.
Photovoltaic bracket is related to the safety and life of the whole system. Some bracket steel thickness is not up to standard, or galvanized layer is too thin, with two or three years on the rust, deformation. Selection of bracket can give priority to hot-dip galvanized steel or aluminum alloy material. Hot-dip galvanized steel bracket need to see whether the galvanized layer is uniform, there is no leakage of plating place; aluminum alloy bracket pay attention to the purity of the material, impurities more prone to fracture. Before installation, you can weigh the weight by hand, too light may cut corners.
Lightning protection convergence box in lightning protection plays a significant role, do not save money to save this accessory. Selected lightning protection convergence box to see the parameters of the inside of the lightning arrester, throughput capacity should be large enough, at least to reach dozens of kiloamps, so that in solving the current problem. Because some poor quality lightning protection convergence box, inside the lightning protector is a setup, can not play a role in lightning protection, once encountered lightning strikes, the entire photovoltaic system have to be affected.
Selection of photovoltaic accessories considerations: a look at the brand and certification, don’t be greedy for cheap; two to focus on the core parameters and the actual performance of whether or not to match; more reference to other users of the real comments. In accordance with these pit avoidance techniques to choose accessories, your PV system with heart-saving and peace of mind. If there is still not quite understand the place, at any time to find a professional electrician to consult, do not blindly start.
