Road building and EVs
- Feb 18, 2022 11:55 am GMT
The current rage for charging EVs is using in road or over road chargers, so that you never have to stop to charge the batteries, and in fact you don’t need much battery as the system is envisioned by many.
Both systems have analogs in the railroad industry with Overhead catenary ~98% and third rail ~92% efficient. Much of the difference in voltage (25KV vs. 750V).
For EVs the idea is to install inductive coils continuously in each lane, if the chargers are installed to provide the maximum power transfer the EV needs to stay within roughly 7 inches of the center of the lane.
The first question that comes to mind is do you install in intersections, on and off ramps and other areas like this where the electrical infrastructure become complex, or only in the driving lanes?
Inroad it is potholes – if the coils are exposed by potholes or failing surfaces? If the end of a coil is exposed, how to you keep it erupting and causing damage or shorting the lane out for some distance?
For overhead catenary it is height and voltage – Higher voltages are much easier to create and maintain, lower losses, and higher efficiency in transfer. They require less in the way of substations and connections to the grid. For height – what is safe for people and animals, and what is also the right height to avoid high vehicle issues, but minimize tall electrode whips that reach to the lines?
Many practical issues are still open on charging while moving, and little discussion about the issues, and practical solutions have been discussed.
If we are going to provide in route charging this discussion needs to accelerate.