In the solar garden lamp design, involves the light source, the solar cell system, the battery charge and discharge control many factors, any one link appears the problem will cause the product flaw.
Solar Garden lamp is composed of solar panel, solar charge and discharge controller, solar energy storage battery, load and lamp housing.
The main function of solar panels is to convert light energy into electricity, a phenomenon called photovoltaic effect. In many solar cells in the more common and more practical is mainly monocrystalline silicon cells, polycrystalline silicon solar cells and amorphous silicon solar cells three kinds. In the east-west area of sunny sunshine, the use of polycrystalline silicon solar cells is good, because the production process of polycrystalline silicon solar cell is relatively simple, the price is lower than that of monocrystalline silicon, and the conversion efficiency has been improved in recent years. In the rainy day more than the sun is relatively not very sufficient in the South, the use of monocrystalline silicon solar cells for good, due to monocrystalline silicon solar cell electrical performance parameters are relatively stable. But amorphous silicon solar cells in the indoor sun is very weak, because the amorphous silicon solar cells on the solar light requirements are relatively low.
Solar cells have five major electrical performance parameters:
1. ISC is short-circuit current
2. Im is the peak current
3, VOC is open-circuit voltage
4, the VM is the peak voltage
5, PM is the peak power
Note: PM is peak power = im is peak current xvm is peak voltage.
For a single solar cell, it is a PN knot, which, in addition to being exposed to sunlight, generates electrical energy and has all the characteristics of the PN knot. Under standard illumination conditions, its rated output voltage is 0.48V. Solar panels are made up of a number of solar cell connections in the use of photovoltaic lighting fixtures.
Solar Charge and discharge controller
Regardless of the size of solar lamps, a good performance of the charge, discharge control circuit is essential. In order to prolong the service life of the battery, it is necessary to limit the charging and discharging conditions to prevent the overcharge and the deep discharge of the battery. In addition, because the input energy of solar photovoltaic system is very unstable, the control of battery charging in photovoltaic power system is more complicated than that of ordinary battery. For solar lighting design, success and failure often depends on the success and failure of charge-discharge control circuit. Without a good performance charge and discharge control circuit, there can be no good solar lamps. The charge and discharge controller must have several characteristics:
1. Anti-charge control
2. Anti-overcharge control
3. Anti-discharge control
4. Temperature compensation
Solar energy Storage Battery
Because the input energy of solar photovoltaic system is not stable enough, the general need to configure the battery system to work, solar lamps are no exception, the battery must be configured to work. There are lead-acid batteries, NI-CD batteries, ni-h batteries, their capacity selection directly affects the reliability of the system and the system price. The selection of battery capacity generally follows the following principles: first of all, in order to meet the night lighting, the energy of the day solar modules stored as far as possible, but also to meet the continuous rainy night lighting needs of electricity. The battery capacity is too small to meet the needs of night lighting or can not meet the needs of continuous use; the battery capacity is too large, the battery board can not provide enough charge current, the battery is often in a state of power loss, affecting the battery life, and also cause waste.
Solar lighting products to save energy and environmental protection as an advantage, of course, the load to save energy, long life. We generally use LED lights and 12V DC energy-saving lamps and low pressure sodium lamps.
Most lawn lamp selection led as light source, led life long, can reach more than 100,000 hours, low working voltage, very suitable for use in solar lawn lamp.
The courtyard lamp generally uses the LED lamp or the 12V DC energy-saving lamp, the DC energy-saving lamp voltage is DC, does not need the inversion, facilitates the safety.
Street lamps are generally used 12V DC energy-saving lamps and low pressure sodium lamps, low pressure of high lighting efficiency but relatively expensive, the use of relatively few.
LED Lamp Housing
Most of them choose energy saving between beauty and energy saving. The appearance of lamps and lanterns should not be very high, relatively practical line.
To sum up, in the selection of their own solar garden lights, in addition to the product itself with energy-saving, environmental protection characteristics, but also focus on the use of product stability and product economy.
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