Project - EA2 UK First Solar Powered Permanent Traffic Signal

The Logic:​

After detailed review of all the load introducing components, we were able to size a solar array capable of maintaining the electrical supply even in full winter conditions. This was subjected to planning review and once passed developed into a detailed design.

• Solar Power from the panels charges the main batteries and supplies the power for the traffic lights and controls.​
• During darkness the batteries automatically support the load.​
• In a fault condition resulting in loss of power from the inverter (or during switching) the online UPS system supports the load to ensure this is continuous and no outage is seen by the traffic signal controller. 
• The auto dialler monitors the fault condition relay and generator start function and automatically dials the emergency phone numbers (text and speech) should it be required.                                                                                                                                                                                                                                                                                                                                                                                                                                                      The solar power solution was subjected to vigorous review by the client and Suffolk Country Council. Following on site witnessing of the control mechanisms and redundancy within the system this has been accepted by the council for use with the traffic signals making the system the first non-DNO connected traffic signal system in the UK.