5 Factors You Need to Consider When Designing Solar Street Lights

As one of the renewable energy, solar energy is becoming more and more popular. And solar street lights market grows rapidly in the past 10 years because of the cost of solar street lights components, such as panel and battery, slowed down a lot. And especially this year in 2019, the solar panel price drop down 20% around compared to the solar panel price in 2018.

With the battery cost slowing down in the following years, we can make an optimistic estimates that the market of solar public lighting will keep on grow rapidly in the following 5 years. The following diagram is the word “solar street lights” in Google trend since 2004 all around the world. It shows the worldwide market request of the solar street lights rises 5 times around.

In the market, there are 3 main types outlook design: Seperated (split) design solar street lights, Two in one solar street lights, All in one solar street lights(integrated solar street lights). The outlook of solar street lights can be different, but the key to decide the solar street lights are the four components: solar panel, battery, led, and solar charge controllers. And the solar panel and battery are the main two components take the most part of solar street lights costs.

At present, the solar street lights price is still the key point to limit the solar street lights markets. So the cost of solar panel and battery is the key to make sure that the solar powered street lights are really helping end customers save their cost in electric bills.

So how to earn money in solar street lights business?

The first and most important thing is how to design it. When customers such as Construction Company, solar energy company and led lights company make the solar powered street lights proposal for the government solar lighting projects, they have no idea how to start. Here we list the 5 main factors need to be considered when design solar street lights.

Factor One: Circumstance

At present, the main place of solar street lights installation is still in rural area and island that the the grid power still hard to reach. The first investment of the grid power will be huge in that place. So the solar street lights solution has totally advantage in Flexible investment.

Customers can try some samples or demo projects to test the real solar street lights quality first, and add the quantities as their initial needs after the testing. Another place that we do not advice to install the solar street lights is the cold place.

Because the solar panel and battery cannot work well in cold winter. To make sure enough lighting time, solar panel and battery need to be settled very big and cost of whole solar street lights system will be high accordingly. In a summary, the circumstance for solar street lights need to be not-low temperature, full of sunshine and lack of grid power.

Factor two: Height and distance

After we make sure the place is ok to install the solar street lights, the next step is to make sure the height and distance of the solar street lights installation. If it is a main street, normally the street lights pole is 8m-9m height with 30-40 meters distance. If it is a park, country road and path way, 4-6m height posts is enough. If it is a high mast for stadium, height needs to be 15-20m.

Factor Three: Brightness, lighting time

After the installation height of solar street lights is confirmed, we can set the led power accordingly. And we set the solar panel power and battery capacity according to the led power, lighting time and dimming way. Normally, for the rural place that there are little person nearby in the night, we set motion dim to save the energy.

When there is no person nearby, the solar street lights will be lighting in a very low energy to save the energy. When there are the persons nearby, the solar street lamps will work in full power. If the place is main street which there is the heavy traffic in the first 6hours of the night, we need to set 6hours in full brightness and 6hours in 30% to 50% brightness.

No doubt that the motion dimming way will cost less energy than the auto-time dimming way. Therefore, we normally set 1.5 times bigger for auto-time dimming way solar lighting solution than the motion dimming way solar lighting solutions.

Factor Four: The quality of the material

It will be a long topic for the solar street lights components. Here we just listed the most important parts. There are 2 main types solar panel: mono-crystalline solar panel and poly-crystalline solar panel. Because the mono-crystalline has a better conversion rate and better performance in cloudy days, mono-crystalline solar panel is what we advise for solar street lighting. And real good solar panel life can be more than 25 years.

The main battery types for solar streetlights is lithium battery and gel lead acid battery. Compared to the gel lead acid battery, the lithium battery has much longer cycle life and support deep discharge. Somehow, there is bad quality lithium battery which the cycle life can be much shorter. And the same battery brand, there are the grade A,B,C for different quality and cycle life battery cells. So check the battery quality carefully when you talk with your solar street lights suppliers.

To the solar charge controllers, there are also two types: MPPT and Pwm. Mppt controllers are more expensive than the PWM. Somehow, the mppt controller performs much better than the pwm controllers. We did a real test, the 60W mono solar panel with mppt controller in cloudy day, its real output power can be 15W around. However, the 60W mono solar panel with pwm controller in cloudy day, its real output power is 6-7W only. But mppt controllers are not proper for all the solar outdoor lights projects considering about the cost.

Led is already the main light source because it is energy saving. Now in 2019, the highest luminous efficacy of led chips can reach 230lm/w around. And the luminous efficacy is really important for solar street lights system. Because the main cost of solar street lighting system is in solar panel and battery.

If we use higher luminous efficacy led chips, we can use lower led power to reach the same lumens. Then we can low down the solar panel power and battery capacity to low down the whole solar street lamps costs. So if we use 230lm/w led chips to replace 160lm/w led chips, the solar street lights cost can low down 30% more.

Factor Five: Installation

Yes, it is also important for the solar street lights installation. If we do not deal with some solar street installation details carefully, the solar street lights will not work well. The first important thing is to make sure there is no shadow on the solar panel even small shadow such as leaf and wire. The send thing is to make sure there is no other bright light source near the solar street lights, because the solar street lights has the function of dark to dawn dim. If the circumstance is bright enough, the solar street lights system will turn the led off automatically in the night.

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