Solar street lights are raised off-grid solar plants which convert solar energy into electricity to run a bulb or LED mounted on a pole. They have battery backup which can be sized according to the needs.
These come in various configurations such as:
- With separate LED, battery and inverter
- With LED and battery in-built in one box and an inverter
- With all three components in same unit
- With LED and inverter in-built in one box and battery
Consumer can choose one of these according to their needs.
We also design systems for consumers who have needs other than the ones mentioned above.
Components of Solar Street Light System
The major components of this arrangement are described below:
Solar panels are semiconductor devices which convert sunlight into direct-current (DC) electricity. These are connected either in series or in parallel to add up voltage and current respectively depending on the requirement/designing of the solar plant.
These are long life devices and the warranties provided by the companies are of 25 years. They may well exceed their warranty life in most cases.
Solar panels require very low maintenance as only periodic washing needs to be done. Period of washing varies from location to location but can generally be taken as once in two weeks.
Inverter is an electrical device which converts DC electricity from panels into AC electricity to be used by various appliances in homes, factories etc.
These devices have very high efficiency, generally more than 95%. Manufacturer’s generally provide a warranty of 5 years.
Luminary is the light bulb or LED which is to be used in the solar street light. Now-a-days various configurations of luminaries are available. Luminaries with built-in both inverter and battery (Li-ion) or only built-in inverter are available in the market. This not only reduces the weight on the pole but makes the system simpler. These days, LED luminaries are preferred over bulbs for its longevity and low power consumption and hence, longer backup.
Now-a-days, these luminaries have automatic light sensors which power on the luminary automatically as soon as the ambient light reduces below a threshold.
Batteries are storage devices that store charge to be used in times when there is no generation of electricity.
Luminaries run on batteries at night which are charged during the day.
The sizing of the batteries can be done according to the necessity of backup required and the capacity of luminary on which it is to be used.
Being a street light, pole is necessary so that light spreads across the area.
The poles need to be strong and capable enough to withstand luminary, solar panel and battery’s load. However, there are various designs of solar street lights available and how much weight will be loaded on the pole depends on both the design of street light and its capacity. It should also withstand various seasons, be it, summer, winter and monsoon without getting degraded.
The length of pole depends on the height required for solar street light. This depends on the personal requirement. The poles length can vary from 3 meters to 15 meters.
These are wires through which different components of the solar system are connected with each other.
Solar Panels covert sun’s energy into electricity which charges the batteries during the day. The charge gets stored into the batteries to be used during night. At night, the charge stored in the batteries light the luminaries and gets recharged the following day to be used in the following night.
Many configurations of street lights can be possible:
- With single inverter for many street lights
- With DC Luminary
- With AC Luminary
Various types of luminaries have already been explained. The type of configuration to be used depends on the requirement.
Benefits of installing an On-Grid Solar Power Plant
- No external source of power required to light solar street lights other than sun’s energy
- Solar power is a free source of energy
- Get return on investment within 4 to 5 years.
- Life more than 25 years
- Zero maintenance
- Complete back-up is provided by this system. Batteries can be sized according to the requirement of back-up
- Get 25 years warranty on solar panels and 5 years complete system warranty
- No additional/hidden costs
- Save Earth by saving tons of carbon dioxide emissions per year
In comparison to thermal power plants, solar power plant can save up to 1 kilogram of carbon dioxide emissions per 1 kWh (unit) of solar power. Therefore, by these estimates, one can save up to tons of carbon dioxide emissions per year.
These savings are equivalent to planting hundreds of trees every year.
This not only prevents climate change but also helps reduce respiratory and cardiovascular health issues faced by thousands of people around the world because of increasing pollution.