EV Route Charge Planner Range AI

Trip feasibility reduces to usable energy divided by an efficiency that is not constant. Efficiency in miles per kilowatt-hour runs from about 1.8 to 2.2 for full-size electric trucks up to 3.5 to 4.5 for aerodynamic sedans, and it falls with speed because aerodynamic drag rises with the square of velocity. The temperature term reduces effective efficiency below 70 degrees F at 0.8 percent per degree down to a 40 percent floor, and above 85 degrees F at 0.5 percent per degree to a 15 percent floor. Cold penalizes twice over: lithium-ion cells have higher internal resistance and less usable capacity when cold, and cabin heat must be drawn from the pack rather than from waste engine heat. Road testing published by AAA in 2019 measured roughly 41 percent range loss at 20 degrees F with the cabin heater running. Charging stops are planned across the 20 to 80 percent window because DC charge power tapers sharply as the pack fills, and the final 20 percent can take as long as the preceding 60. The model adds 60 percent of pack capacity per stop at an assumed 150 kW average, so a 75 kWh car gains about 45 kWh in roughly 18 minutes. Real sessions are usually slower: delivered power depends on the vehicle's maximum accept rate, pack temperature, whether a cabinet is shared with an adjacent stall, and arrival state of charge. Cost comparison assumes 0.35 dollars per kWh for public fast charging against 0.13 at home.

Range measurement was standardized before mass-market electric cars existed. SAE J1634 defined a chassis dynamometer procedure for electric vehicle energy consumption and range, and the Environmental Protection Agency adopted a version of it for the window sticker figures that appeared when the Nissan Leaf and Chevrolet Volt reached buyers in December 2010. The agency introduced MPGe at the same time so that electric and gasoline vehicles could be compared on a single label, which is also why published range numbers reflect a laboratory cycle rather than highway driving in winter. Fast charging developed as a standards contest. CHAdeMO was released in Japan in 2010 by a consortium that included Tokyo Electric Power and several automakers. The Combined Charging System was agreed by European and American manufacturers in 2011 and 2012. Tesla opened its proprietary Supercharger network in 2012 using a different connector, published that connector as the North American Charging Standard in 2022, and saw Ford, General Motors, and most other manufacturers commit to it during 2023. Planning software followed the hardware: PlugShare began as a crowd-sourced charger map in 2011, and A Better Route Planner, created by Bo Lincoln in Sweden around 2016, popularized optimizing a whole trip through short 20 to 80 percent charging segments instead of filling to 100 percent. In the United States, the 2021 infrastructure law funded the NEVI program to place fast chargers along designated corridors.