By zhanqun1 
Ⅰ、How to quickly distinguish between monocrystalline silicon and polysilicon?
Judging from the shape: the monocrystalline silicon slice is rounded square, the circular slice is formed after processing, the polycrystalline silicon slice is a standard square, and the square ingot slice (as shown in the figure above).
The photoelectric conversion efficiency of the monocrystalline silicon board is higher (usually more than 20%);Polycrystalline silicon board: their efficiency is a bit lower than the monocrystal ones, generally between 15%-17%.
From an application perspective, mono crystalline silicon is more applied to the situations with small spaces but high efficiency, its price is high, especially rooftop solar energy. As to polysilicon with its low cost, suitable for large-scale ground power stations.
Ⅱ、What materials is a photovoltaic panel composed of?
A photovoltaic panel mainly consists of an aluminum alloy frame, glass layer, battery, packaging material (EVA), a junction box, cable, and connector.
Photovoltaic glass: toughened glass, good light transmission, high hardness. The battery is very fragile, and photovoltaic glass cannot be directly attached to it. EVA film is needed to play a bonding role in the middle. Similarly, EVA film also plays a bonding role between the panel and the backplane.
Photovoltaic backplane, the backplane also plays the role of protecting the battery sheet. The backplane must be sealed, insulated, waterproof and aging resistant. Material, generally using TPT or TPE material.
Ⅲ、How much power can a photovoltaic panel produce?
In the figure above, the single crystal silicon folding photovoltaic panel of Huijue Group is an example. His maximum power is 300w, expansion size: wide 2408mm *740mm area about 1.78.58 square meters, assuming that every day 4 hours of effective power generation, the output power is 300w * effective light time * 90%,300W * 4 * 90% = 1080wh, around 1 KWH of electricity, configuration 1-2 blocks can fully meet outdoor travel use.
This flexible folding photovoltaic panel weighs only 9.2 kg and is strong, flexible, and durable. The self-cleaning ETFE thin protection is IP54 waterproof and photoelectrically efficient, with up to 22% conversion efficiency. Meanwhile, it can raise the efficiency of light energy being converted into electrical energy.
Ⅳ、Key parameters when buying photovoltaic panels
Open circuit voltage (Voc) and Short circuit current (Isc) : To be in tune with the system design so as not to surpass inverter or controller input limits.
Temperature coefficient: Choose products that have a low temperature coefficient to ensure more stable performances in high-temperature surroundings.
Weather resistance: This is for the corrosion-resistant and anti-aging ability of the photovoltaic panel in different climatic conditions.
Buying photovoltaic panels according to the aforementioned factors will help you find more efficient and durable merchandise.