Solar Lanterns are composed of five parts: solar panels, charge and discharge controllers, batteries, load and lamp housing. In the design of Solar Lanterns, involving light, solar cell systems, battery charge and discharge control and many other factors, any one of the problems will cause product defects.
The main function of solar cells is to convert light energy into electricity, this phenomenon is called the photovoltaic effect. In many solar cells in the more common and more practical monocrystalline silicon, polysilicon and amorphous silicon and other three solar cells. In the sunny, sunshine good east and west regions, the use of polysilicon solar cells as well. Polycrystalline silicon solar cell production process is relatively simple, the price is lower than the single crystal, conversion efficiency continues to increase. In the rainy days are more, the sun is not very adequate in the southern region, the use of monocrystalline silicon solar cells as well, because the monocrystalline silicon solar cell electrical performance parameters are relatively stable. The amorphous silicon solar cells in the indoor sun is very weak case is better, because the amorphous silicon solar cells on the sun light conditions are relatively low.
First of all, any Solar Lanterns products we must first understand the solar cells, solar cells have five major performance parameters, namely: short circuit current, peak current, open circuit voltage, peak voltage, peak power.
For the average user, how can we know its five parameter values? Teach you a simple way, let us know this parameter relatively, we can at 12 o'clock in the case of sun with a multimeter to test the five parameters (of course, this measured the value will be a little error).
For monolithic solar cells, it is a PN junction, in addition to when the sun is lit on top, it can produce electricity, it also has all the characteristics of PN junction. Under standard lighting conditions, its rated output voltage is 0.48V. In the use of Solar Lanterns in the solar cell components are composed of multi-chip solar battery connection.
Users can look at the solar battery to understand the price, performance and stability of Solar Lanterns lighting. Here I will charge and discharge controller, load, battery, etc. for the introduction.
Charge and discharge controller
Regardless of the size of Solar Lanterns, a good performance charge and discharge control circuit is essential. In order to extend the battery life, it must be its charge and discharge conditions to be limited to prevent the battery overcharge and deep discharge. In addition, because the input energy of solar photovoltaic power generation system is extremely unstable, the control of battery charging in photovoltaic power generation system is more complicated than that of ordinary battery charging control. For the design of Solar Lanterns, success and failure often depends on the charge and discharge control circuit success and failure.
Without a good performance of the charge and discharge control circuit, it is impossible to have a good performance of Solar Lanterns. Charge and discharge controller must have the following characteristics, namely: anti-charge control, anti-overcharge control, anti-discharge control, temperature compensation.
As the solar photovoltaic power generation system input energy is very unstable, so generally need to configure the battery system to work, Solar Lanterns is no exception, you must configure the battery to work. Generally, lead-acid batteries, Ni-Cd batteries, Ni-H batteries, their capacity selection directly affect the system reliability and system prices. The choice of battery capacity generally follow the following principles: first in the night to meet the premise of lighting, the daytime solar cell components as much as possible to store energy, but also to be able to store to meet the continuous rainy night lighting needs. The battery capacity is too small to meet the needs of night lighting. Storage capacity is too large, the battery is always in a state of loss, affecting the battery life, while causing waste.
Solar energy products to energy saving and environmental protection for the advantage, of course, load to energy saving, long life. We generally use LED DC energy saving lamps and low pressure sodium lamps and so on.
At present, most of the lawn light selection of LED as a light source, LED long life, can reach more than 100000h, low working voltage, very suitable for use in solar lawn light.
Garden lights generally use LED and DC energy-saving lamps. DC energy-saving lamp voltage is DC, no inverter, convenient and safe.
Street lamps generally use low pressure sodium lamp. Low pressure sodium lamp high luminous efficiency (up to 200LM / W) but low pressure sodium lamp price is relatively expensive.
We collected a lot of foreign solar lights information, between the beautiful and energy-saving, most choose energy conservation. Lamp appearance requirements do not be very high, relatively practical on the line. At present there are many domestic lighting is very beautiful appearance, the choice of stainless steel shell. But what about performance? This makes us think again!
A good Solar Lanterns products, the key lies in the system design, how is a reasonable system design? Let us first look at the impact of the system several important factors, which is latitude, solar energy on the surface of the total annual radiation, the longest sunshine days, daily power consumption and the average number of sunshine hours.
Let us imagine: if the solar battery charge is insufficient, what happens every day discharge? Rainy days for several years the system can still lighting it? These questions are designed by our designers.