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How to design and calculate Solar Street Light system?


In this blog we will try to help you understand how to design cost effective Solar PV System for Street Light.

First of all let's start from basics: What is solar PV system?

Solar power system is one of renewable energy sources which uses solar PV modules to convert sunlight into electricity. The energy generated can be either stored or used directly, fed back into grid line or mixed with one or more other electricity or different renewable energy source. Solar system is the most reliable and clean source of electricity that can suit a wide range of applications such as residence, industry, agriculture, livestock, etc. Of course, if the first condition is achieved: Enough SUN hours.

Solar Street Light

includes different components that should be selected according to your system type, site location and applications. The main parts for solar street light system are solar panel, solar charge controller, battery, inverter, pole, LED Light.

Below we will briefly mention basic features of each part:

• PV module – converts sunlight into DC electricity. • Solar charge controller – regulates the voltage and current coming from the PV panels going to battery and prevents battery overcharging and prolongs the battery life. • Battery – stores energy for supplying to electrical appliances when there is a demand. • Load – is electrical appliances that connected to solar PV system such as lights, wifi, camera, etc,

Now when you know the basics about all parts it is very useful to undersdand how to design and determine the best system for your solar street light project. In order to that you should:

1. Determine what is power consumption of your street light

The first step in designing a solar street light system is to find out the total power and energy consumption of LED light and other parts that will need to be supplied by solar power, such as WiFi, Camera etc. need to be supplied by the solar PV system.

How to calculate total consumption of your solar system? Simply follow the steps below:

1.1 Calculate total Watt-hours per day for each part used. Add the Watt-hours needed for all parts together to get the total Watt-hours per day which must be delivered to the appliances. 1.2 Calculate total Watt-hours per day needed from the PV modules. Multiply the total appliances Watt-hours per day times 1.3 (the energy lost in the system) to get the total Watt-hours per day which must be provided by the panels.

Image: solar street light solutions from: www.engoplanet.com