6.2. Selecting chargepoint type
Different specifications of charging infrastructure to consider
The cost and planning requirements for a network connection can vary greatly. The size of the new connection will depend on the number and type of chargepoints to be installed.
The available energy supply is a key factor influencing decisions on the selection of chargepoints for a public charging development.
The table below provides a simple illustration of the time and cost associated with installing different types of chargepoint. As you can see, both time and cost increase as the scale and complexity of the installation grows.
It should be noted that streetlight retrofits are often not possible in Scotland, particularly when these are sited to the back of the pavement. This is because a trailing cable between the vehicle and lamp would present a trip hazard to pedestrians.
The speed at which a chargepoint charges a vehicle is dependent on both the power rating of the chargepoint and also on the capability of the car itself. Typically, slow chargers are rated up to 3kW AC, fast chargers up to 22kW AC, rapid chargers up to 43kW AC or 50kW DC, and ultra-rapid chargers up to 360kW DC.
These types of chargepoints represent the breadth of those on the public network in Scotland. Megawatt-scale charging solutions are emerging as an option for some of the largest road vehicles, specifically those that operate shift patterns that require a high charging turnover. This may include buses and articulated lorries that travel long distances and have little downtime. The cost considerations section outlines the hardware and installation costs of some chargepoint types.
All installations should adhere to the IET code of practice, with particular attention paid to the necessity for TT earthing and risk assessment of distances to other metallic street furniture.
