How to correctly choose and buy solar photovoltaic panels?

Unstable as a result of the solar photovoltaic power generation system input energy, so generally need to configure the system to work, battery solar lamps and lanterns is not exceptional also, you must configure battery to work. Usually have a lead-acid battery, Ni - Cd accumulator, Ni - H battery

due to the unstable input energy, solar photovoltaic power generation system need to configure the battery system can work normally, solar energy lamp is no exception, the battery must be configured to work. Generally have lead-acid batteries, nickel cadmium battery and nickel metal hydride batteries. Their capacity to choose direct influence on the reliability of the system and price. The choice of battery capacity in general should follow the following principles: first, under the premise of meeting the night lighting requirement during the day the energy of the solar energy battery components should be stored as much as possible, at the same time, the electricity required to continuous rainy days night lighting should be stored. Battery capacity is too small, cannot satisfy the needs of night lighting. Battery capacity is too big. On the one hand, the battery power is always out, affect the service life of the battery, resulting in waste. At present, the solar cells on the market is divided into amorphous silicon and silicon. Among them, the crystalline silicon can be divided into polycrystalline and monocrystalline silicon. According to the photoelectric conversion efficiency of three kinds of materials: monocrystalline silicon ( Up to 17%) gt； Poly ( 12 ~ 15%) gt。 Amorphous silicon ( About 5%) 。 However, crystalline silicon ( Monocrystalline silicon and polycrystalline silicon) Basic does not produce current under the weak light, weak light and amorphous silicon has good type ( Under the weak light energy few) 。 From the point of view of comprehensive, therefore, should use monocrystalline silicon or polycrystalline silicon solar cell materials. The solar cell selection method 1. When we choose and buy the solar cell, with a focus on the solar battery power. In general, the power of solar cells and solar power is proportional to the area of the chip. Solar cell chip area is not completely equal to the area of the solar packaging board, because although some solar panels is very big, but by a single solar wafer to arrange clearance is very wide, and the solar panel power is not necessarily very high. 2. In general, the greater the power of solar panels, the better, the greater the current result in the sun, and the built-in battery can be quickly filled. But in fact, we need in the power of solar panels and solar charger find a balance between portability. It is generally believed that the power of solar charger should not be less than zero. 75 watts. In standard under strong light, the second current of solar panels to power 140 ma. General current generated in the sun is about 100 ma. If the charging current is too small, less than a second power supply, basically does not have a significant impact.