Hybrid Street Lighting

We supply hybrid street lighting systems across Northern Ireland (NI) and Southern Ireland (ROI) Street and road lights are essential to the general public not only as a means for night illumination but also a form of security and urban beautification. However, street lights consume much power especially along long highways. In addition, due to the need to transfer low voltage power over long distances, much of it is dissipated in the transmission lines. This is a reason why some suburban areas may be without street lights. Our new WindRider wind/solar hybrid light unit is an ideal solution that is self ustainable and saves electrical power, with a good return on investment for many cities. It is designed and tested using advance computer-aided techniques, its rotor blades are aerodynamically engineered to give maximum energy coefficient and the turbine a low cut-in speed. WindRider housing is made with light but robust alloy and steel. Installation is simple. WindRider is reliable even in extreme environments. WindRider comes in three sizes to best fit your needs. Product Benefits Social Benefits Our wind/solar hybrid lights not only provide a real power saving solution to us, they also project an environmentally clean image that improves a modern city. The scene of rotating wind turbines gives the city a lively fast-moving 21st century image. In addition, they advocate energy saving and environmental protection concepts to the wider public.

Economical benefits
Conventional street lights need buried electrical cables for power supply and also electrical transformer substations, they contribute considerably to the construction cost. Due to relatively low AC voltage across a thin cable over a long distance, the power dissipation on the lines contributes to energy waste.

Our WindRider wind/solar hybrid lights on the other hand do not have the above issues and hence has a lower run rate than conventional street lighting system. No power is wasted in the transmission network.

Wind and solar energy is also renewable. Once installed, there is practically no running cost. Little maintenance is required and the wind/solar hybrid lights provide cost effective illumination to the roads.

Educational benefits
Our WindRider wind/solar hybrid lights can directly demonstrate the renewable power in the wind and sunlight, which is clean compared to fossil fuels. It is a good application to protect the environment.

Hybrid Light Unit design

Hybrid Power
The wind/solar hybrid street lighting unit consists of a 400W wind power generator, a 150W solar photo voltaic panel, a set of 55W low voltage light, and two 150AH/12V lead-acid battery units. The wind/solar hybrid street lighting unit is capable of providing 10 to 14 hours of lighting.

Part list

Power Generation considerations
During the system design, it is assumed that the average wind speed in the area of
installation is 4m/s:

Due to unequal condition of each lamp unit construction along the road, it is assumed that the lamp unit annual average wind speed is below 4m/s. The installed wind turbine should generate a daily average power of: Q1 = 0.489KWH

For solar energy, a 1KW solar cell board transforms solar energy at 4,500 ~ 5,500 MJ/year. To give allowance, it is assumed that the solar energy transformed in the area of installation is 4500MJ/year. Hence, the choice of solar panel should generate a daily average power of: Q2=0.411KWH

Hence the total power generated daily by the Wind/Solar Hybrid unit is 0.9KWH. Even if performance is affected by varying wind and sunlight conditions due to season and weather, the wind/solar combination supplements each other such that the average annual power calculated is sufficiently compensated. During the design, we have assumed the lowest performance condition with an additional 0.8 safety factor, the resulting daily average power generation rating is considerably reliable.

Power Consumption considerations
The design uses a 55W low voltage sodium bulb and if other system equipment dissipates power at 10W, then the total power consumption is 65W.

Assume daily operating time is 10 ~ 14 hours, the lamp unit 0.65 ~ 0.91KWH daily. Hence the wind/solar hybrid light unit is capable of illuminating a 55W light every day for 10 ~ 14 hours.

Features include:

• Automatic charge and discharge controller to extend lead-acid
  battery service life
• Self-non-stop operation mode
• Open and short circuit protection, auto-restart capabilities
• Uses specialised Integrated Circuit to control light with over current and over voltage protection, light bulb open and short circuit protection.
• Surge protection
• Light temperature control
• Able to work in adverse weather conditions
• Little maintenance required.

Light Position considerations

For 13-meter wide roads
For vehicle and pedestrian roads, where the traffic volume and vehicle speed are low and the road surface cement/concrete of no wider than 13 meters, the single side arrangement may be used.

The lighting unit uses a IP44 55W low voltage sodium light bulb for illumination with max brightness of 8000 Lm. Using pole and positions as: Pole height H=6m, Spacing S=30m, Light bracket length = 1.5m We obtain an effective range of illumination = 11.5m

Assumptions:

• the area is not polluted, road is in a relatively clean condition
• street light utilization factor U=0.32 (international illumination committee to recommend 0.3)
• maintains coefficient K=0.8;

Based on the pole design and the above assumptions, the road surface average degree of illumination is calculated as follows:

Eav=U×F×N×K/W×S
=0.32×8000×1×0.8/11.5×30
=5.93Lx

From the degree of illumination chart, we can see that the minimum illumination Emin is no less than 3Lx. Hence the Uniformity of illumination can be calculated as:

Emin/Eav=3÷5.93=0.5

This meets most city’s 13-m road illumination requirements of:
Degree of illumination Eav is no lesser than 3.5Lx
Uniformity of illumination Emin/Eav no lesser than 0.3.

For 30-meter wide roads
For vehicle and pedestrian roads, where the traffic volume and vehicle speed are higher and the road surface cement/concrete of no wider than 30 meters, the double side arrangement may be used.

The lighting unit uses a IP44 55W low voltage sodium light bulb for illumination with max brightness of 8000 Lm.

Using pole and positions as: Pole height H=8m, Spacing S=25m, Light bracket/boom length = 2m

We obtain an effective range of illumination = 13m

Assumptions:

• the area is not polluted, road is in a relatively clean condition
• street light utilization factor U=0.32 (international illumination committee to recommend 0.3)
• maintains coefficient K=0.8

Based on the pole design and the above assumptions, the road surface average degree of illumination is calculated as follows:

Eav=U×F×N×K/W×S
=0.32×8000×1×0.8/13×25
=6.3Lx

From the degree of illumination chart, we can see that the minimum illumination Emin is no less than 3Lx. Hence the Uniformity of illumination can be calculated as:

Emin/Eav=3÷6.3=0.47

This meets most city’s 30-m road illumination requirements of:
Degree of illumination Eav is no lesser than 5.6Lx
Uniformity of illumination Emin/Eav no lesser than 0.35.

Project references

Hybrid street lighting

We are situated in Castlerock, between Coleraine and Limavady, County Londonderry, NI, our hybrid street lighting supplier services stretch right across Northern Ireland including counties Fermanagh, Tyrone, Derry, Antrim, Down and Armagh. We even supply hybrid street lighting to Southern Ireland. To find out if KMK New Energies can supply you with hybrid street lighting, click here to find out more.