The function of diodes in solar energy is to protect the panel cells. Generally speaking, it is not necessary to use diodes for small panels (30W) or less. The use of diodes depends on the cell arrangement. the panel and the number of conductor wires. To decide, for example, for a 180W monocrystalline battery panel, the battery cells are arranged into 6*12 rows, and the lead wires are 4, that is, 3 diodes are used at this time. , the battery panel protected by each diode is composed of 24 cells. If multiple small battery panels (referring to 2 wires) are connected in series, a diode can be added to protect the panel's battery cells. If you are only using a single 2.5W battery panel, it is recommended to use a diode. Generally, the power will decrease after connecting the diode. For example, a battery panelie 230 W polycrystalline does not have a junction box (containing a diode) and. a junction box. The final power will differ by approximately 2W.
No need. Bypass diodes are designed to prevent the heat island effect caused by obstructions on the solar panel. In principle, each cell must have one. In practice this is not possible and is the responsibility of the manufacturer. As a user, simply connect a diode to avoid reverse flow. The current of this diode should be more than twice the output current of the solar cell, and the withstand voltage should also be chosen higher than the output voltage. . Try to choose those with lower pressure, such as Schottky tubes. It will not affect the life of the solar panel and there is no need to turn off the battery on rainy days and nights.