powerwin 240w 300w 400w folding solar panel kit

In addition to the renovation of some street lamps in the city, solar street lamps that are energy-saving, environmentally friendly, and easy to install are also a good choice for some places where the power equipment is incomplete or the laying of cables is troublesome.

However, the premise is to purchase solar street lamps of good and appropriate quality. Today we will talk about how to select the core material of the photovoltaic system - 18v 120w solar panels.

Look at the material

There are usually three kinds of materials for making battery panels: monocrystalline silicon, polycrystalline silicon, and amorphous silicon. Among them, monocrystalline silicon has the highest photoelectric conversion rate, that is, it is more expensive, followed by polycrystalline silicon, and amorphous silicon is the worst, which is unstable and will slowly decrease with time. These three kinds can be distinguished from each other in appearance.

The four corners of the single crystal have intercept angles, most of which are arc-shaped, blue-gray, and relatively single texture; The four corners of polysilicon are square, and the surface is mostly gray-white with impurities; The surface of an amorphous silicon battery is very clear and smooth, and there is no grid line, so we must pay attention to distinguish when selecting.

Look at the back

When purchasing, the back of the genset solar panel is often neglected. This place mainly depends on its pressure-bearing effect. After the force is applied to the back, if there are no bubbles, folds, and other irregularities, the surface panel is qualified in this respect.

Look at the border

Generally speaking, the frame of genset solar panels is polished by mechanized operation, to better ensure its accuracy and become a strict rectangle. However, some small factories may not have such equipment, or the equipment is very poor, resulting in uneven efforts to create the frame.

This may cause the frame and the panel to be not in close contact, which will greatly reduce the firmness and affect the service life of the solar street lamp. Therefore, it is best not to find small factories when purchasing 18v 60w solar panels.

Look at the workmanship

In addition to the above, we should also take a good look at the workmanship of the 18v 60w solar panel. The panel is composed of small battery pieces welded in series. The battery pieces of a good panel should be cut as a whole.

Some unscrupulous businesses will use broken battery pieces for splicing. Such battery pieces are easy to break in the later stage, affecting the use effect of solar street lamps; At the same time, pay attention to the welding effect of battery sheets to see whether the pool sheets are arranged neatly and whether there is any missing welding.

In addition, in terms of workmanship, we should also look at the silica gel part. The back of the battery board and the frame are bonded together through it. A good standard is that the silica gel around the back should be evenly distributed and closely penetrated the gap between the back plate and the frame.

If these places meet the standards, don't forget to look at the surface of the battery tempered glass plate to see if there is any silicone dripping on it. This thing will affect the power generation efficiency.