How to correctly judge photovoltaic power station in the levels of solar panels?

Solar panel is the key of photovoltaic power generation system, the core, but because of the quality of the products on the market is uneven, mixed. Choose when buying, it feels like a piece of solar panel is a group of heroes, completely don't know how to start. 1, watch

solar panels is a key and core of photovoltaic power generation systems, but the quality of the products on the market is uneven, there are good and bad. Choose when buying, it feels like a solar panels. Some hero completely don't know how to do? 1. Look at the surface of the toughened glass surface look carefully, in order to improve the production schedule, ordinary small manufacturer produces the product is coarser, surface residual silica gel can reduce panel production efficiency. 2, see the color in general, the appearance of monocrystalline silicon and polycrystalline silicon panel color to blue, light blue or blue relatively uniform. If the color of the panels is dark and not the same, so do manual work is certainly not careful. 3, carefully observe the cell batteries, look at whether there is any lateral crack and crack. At present, many unconventional manufacturers use discontinuous chips, there is a big risk, will affect the safety of the panels. 4. Look back to see the quality of the back pressure. After pressure nonuniformity, such as bubbles, wrinkles, etc. , this is a kind of relatively low quality products. 5. Look at the boundary is straight? Due to the solar panel industry with low barriers to entry, many small manufacturers use artificial framework, the framework of the shape is not strict rectangle, rigidity is greatly reduced. 6. Look at the welding carefully observe the cell string welding leaks. At the same time, to see if the cell arranged neatly. 7. Look into look at junction box junction box, junction box is rigid, junction box cover is firmly connected to the terminal block. Check whether the wire lock can rotate freely and tighten. 8, see the conversion high conversion rate guarantee stable income! The conversion efficiency is invisible on the surface. For the current technology, the conversion rate of solar panels now it is hard to reach 17%. Conversion rate = power/area, for example, for a 200 mw single crystal, covers an area of 1580 * 808 mm, and then according to the conversion formula of conversion rate = 200/1580/808 * 10000 = 15. Conversion rate of 6%, or 200 watts panel is 15. 6%. If a company claims that polycrystalline silicon photovoltaic panels conversion rate over 20%, there must be something wrong with it.