How solar is that solar car?

Above (click to zoom) is a chart showing WLTP-standard solar-only driving ranges for the three solar cars from my last post (battery ranges not shown here):

  • Solar Team Eindhoven’s Stella Era, winner of the BWSC Cruiser class
  • Lightyear One, a commercial solar car from the Netherlands
  • The Sion electric vehicle from Sono Motors

These solar-only driving ranges are marked on a smoothed distribution of electric vehicle driving patterns reported in this paper (distance driven per vehicle-day on days when the vehicle was driven).

The sleek Stella Era has a solar-only range more than 4 times the mean 70 km driven. On more than 99% of trips, Stella Era can operate solar-only, and, on average, its solar panel produces substantial excess electricity which can be donated to other vehicles.

Lightyear One has a solar-only range less than the mean 70 km, but is still able to operate solar-only on 57% of trips.

The less expensive Sion is able to operate solar-only on 19% of trips, and has a useful solar boost to its battery the rest of the time.


2 thoughts on “How solar is that solar car?

  1. A nice follow up to your previous piece Tony.
    Of course, one crucial piece of data is missing from the source paper – the time that elapses between individual trips in each day. If we were able to factor in the re-charging that would occur on a typical working day(ie whilst the car is parked) then the percentages would be significantly improved for both the Lightyear and Sono vehicles.

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