Study: EV Range Drops by 25% Due to “Psychological Safety Buffer”
A doctoral candidate at Technische Universität Chemnitz in Germany concludes that 20% to 25% of the range of an electric vehicle is actually lost in the real world due to what he calls a psychological safety buffer.
Of course, this isn’t always true, as there are countless EV drivers who routinely run their rides down to less than 5% charge or even lower, but the general finding is that most driver’s aren’t willing to push an EV to near its range limit.
A study was conducted around 79 Mini E drivers who logged more than 249,000 miles over the course of 6 months.
Thomas Franke, the man who put forth the “psychological safety buffer” conclusion writes:
“In sum, the suboptimal range utilization found in previous studies is explained by the proposition that there are three psychological range levels besides the technical range that characterize the transition from the objective physical to the subjective psychological range situation: (1) The competent (i.e., maximum achievable for the user), (2) the performant (i.e., available on an everyday basis) and (3) the comfortable (i.e., actual usable) range. It shows that 20-25% of the range resources that are available on an everyday basis are lost as a psychological safety buffer.”
“[The results imply] that the primary objective of vehicle development should not be to increase battery capacity but to increase the comfortable usable range for the driver. If you consider how much increasing the technical range of electric vehicles by 20 percent costs today, it is very promising if one could achieve such an increase potentially also through optimized information and assistant systems.”
Like by including an accurate state of charge meter, perhaps?
For a more detailed analysis of the study, follow the source link below.
Source: Green Car Congress