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Solar street lamp composition

Update:23 Jun 2018
Summary:

Solar street light consists of the following components […]

Solar street light consists of the following components: solar panels, solar controllers, battery packs, light sources, lamp posts, and lamp housings. If the output power is AC 220V or 110V, configure the inverter.

1. solar panels:
Solar panels are the core part of solar street lights, and they are also the most valuable part of solar street lights. Its role is to convert the sun's radiant power into electrical energy, or send it to a storage battery. There are three types of monocrystalline silicon solar cells, polycrystalline silicon solar cells, and amorphous silicon solar cells that are relatively common and practical in many solar cells. In the east-west region where there is ample sunshine, it is better to use polysilicon solar cells because the production process of polycrystalline silicon solar cells is relatively simple and the price is lower than that of single crystals. In the southern regions where there are more rainy days and relatively less sunlight, it is better to use monocrystalline silicon solar cells because the performance parameters of monocrystalline silicon solar cells are relatively stable. Amorphous silicon solar cells are better in the absence of outdoor sunlight because amorphous silicon solar cells have lower requirements for sunlight conditions.

2. solar controller
Regardless of the size of the solar lamp, a well-charging charge-discharge controller is essential. In order to prolong the service life of the battery, it is necessary to limit its charge and discharge conditions to prevent the battery from overcharging and deep charging. In areas with large temperature differences, qualified controllers should also have temperature compensation. At the same time, the solar controller should have a streetlight control function, with light control, time control function, and should have automatic load control function at night to facilitate the extension of streetlight work time in the rainy days.

3. battery
Since the input energy of the solar photovoltaic power generation system is extremely unstable, it is generally necessary to configure a battery system to work. Lead-acid batteries, Ni-Cd batteries, and Ni-H batteries are generally used. The choice of battery capacity generally follows the following principles: First, the energy of daylight solar modules should be stored as much as possible under the premise of meeting the requirements of night lighting. At the same time, it must be able to store the electrical energy needed to meet the lighting needs of continuous rainy days. The battery capacity is too small to meet the needs of night lighting, battery is too large, on the one hand, the battery is always in a loss of power, affecting the battery life, while causing waste. The storage battery should be matched with the solar battery and the electricity load (street lamp). There is a simple way to determine the relationship between them. The solar cell power must be more than 4 times higher than the load power to allow the system to work properly. The voltage of the solar battery must exceed the operating voltage of the battery by 20 to 30% to ensure that the battery is normally negatively charged. The battery capacity must be 6 times higher than the daily load.

4. light source
Which kind of light source is used for solar street light is an important indicator of whether the solar light fixture can be used normally. In general, solar energy light fixtures use low-voltage energy-saving lamps, low-pressure sodium lamps, electrodeless lamps, and DLED light sources.

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