Solar panelsare monocrystalline siliconand polycrystalline silicon.
When you get a solar panel, check if the entire cell has chamfers. If there are chamfers, it can be determined that it is single crystal silicon. If there are no chamfers, then this may be the case. polysilicon. Generally, the color of monocrystalline silicon solar panels is black and darker, and the cells are uniform in color without obvious color difference, while polycrystalline silicon solar panels are blue or dark blue and polycrystalline silicon cells are available in different colors, which appear brighter. the naked eye.
Do not walk on it unless you are afraid of damaging the photovoltaic panels. As there are many cells under the tempered glass of the photovoltaic panel and many smalls solder joints, stepping on them can easily cause the solder wire to break. It is also commonly called a hidden crack. It's not easy to see it with the naked eye at the time, but it has indeed caused damage, so don't step on it!