Solar Panel
Monocrystalline and polycrystalline solar panels are two different solar panels which are widely applied in the solar industry.
Generally speaking, monocrystalline performs better than polycrystalline, especially in cold weather they have higher energy conversion rates than polycrystalline. To data, Sunpower monocrystalline solar panel can reach as much as 24.1% conversion rates.
So, Monocrystalline panels are installed in all in one solar street lights due to its limited size.
These solar panels act as the role of energy collecting and conversion, in the daytime, they collect energy from the sun and then convert them into electric power which will be stored in batteries as chemical energy.
LED Light source
Suffice it to say, as light sources LEDs are prevailing among illuminating market, for its high performance in energy-saving. It definitely can be counted as a new generation of lighting solution.
LED types vary in size and watts, such as 3528, 3030, 5050, 5630, to adapt to different applications.
Our S2 series integrated solar street lights is with Philips LUXEON 3030 SMD, which has almost 190 lumens per watt. A LED module is formed by these single 3030 SMDs which are soldered to an aluminum substrate in advance.
4 pieces of LED modules in 60w all in one solar street lights
Furthermore, an aluminum heatsink is always applied to the rear side of the led modules to help dissipate the heat generated by LEDs. This is very important, for although manufacturers claim that LED has a lifespan of more than 50,000 hours, its light depreciation can be abnormally high if it is working in a temperature larger than 70 Celsius. So we must make sure that the LED junction temperature is under 70 Celsius.
Lithium-ion Battery
Rather than car batteries, which are designed to discharge a large amount of energy in a short period of time, renewable energy industries prefer deep-cycle batteries, for their excellent characteristics in the enduring power supply, deep discharges and far more cycle times, 3000 times, twice or three times more than that of car batteries.
Batteries cycle times is also affected by the depth of discharge(DoD), we will talk more in Chapter 5.
There are two main types of deep-cycle batteries existed in the solar battery market: lead acid and lithium.
