Twelve hundred kilometers on a single battery charge in Australia

Twelve hundred kilometers is the distance solar vehicles in the Cruiser class of the Bridgestone World Solar Challenge must be able to cover in one go this fall. This new rule, which limits teams to recharging only twice between the start in Darwin and the finish in Adelaide, significantly impacts the design of its new solar family car, believes Solar Team Eindhoven.

To make a family car that represents a major step towards cleaner mobility, that is and remains the aim of Solar Team Eindhoven, to use the words of PR manager Marije Sesink, student of Sustainable Innovation. “We see the car as really being a powerbank on wheels, with a larger battery and ever more power available to share. What can we do with that surplus, how can we put this energy to good use?”

How the team is dealing with this question remains for the time being a secret. In keeping with tradition, the complete design, including the necessary new features which Sesink says the team are working on, is being kept under wraps until the car's presentation (expected in early July). But the public can expect some sneak previews of the car's exterior in the coming months promises the spokesperson.

Not out of place

It is no secret that once again STE is building a family car that runs on solar energy, and is basing its design yet again on an aerodynamic droplet form. Nor, says Sesink, will the look of the new four-wheeler be out of place in the Eindhoven solar fleet, “but the car will include a number of major changes”.

Read on below the photo.

For the outside world, a question mark still hangs over whether the successor to Stella Vie will once again have five seats. It is at least known that in Australia the car may carry no more than four occupants - one of the other new rules of this year's World Solar Challenge. Sesink laughs mysteriously, “But that's not to say that we couldn't make a five-seater car”.

The most striking change in the regulations is, however, the limit mentioned above on the recharging opportunities for the Cruiser teams. Participants set off from Darwin with a full battery and may then recharge only twice as they make their way to Adelaide. In the last edition, the team was allowed to recharge every night during the journey. “So now the longest leg we must to be able to cover this time round is twelve hundred kilometers - even in bad weather,” explains Sesink.

Big impact

And that involves some serious challenges - and considerations. By way of illustration, Stella Vie can cover 650 kilometers on a single battery charge, “on a sunny day you can add 350 kilometers to that thanks to the solar panel on the roof. That brings you up to a thousand kilometers”. This means the participating cruisers will have to be permanently equipped with a more powerful battery if they want to reach the finishing line in Adelaide, “which has a big impact on how your car is going to look. But it also creates opportunities, especially in our vision of the car as a powerbank on wheels.”

Read on below the photo.

Another major change is that the 'practicality score' as it is known (in other words, how practical is the car?) will yet again carry more weight, accounting this year for as much as half of the final ranking. And even though this has been an element for which the Eindhoven team has always been able to win the necessary points in the past, “you simply never know exactly what this year's jury will be looking for”.

And besides, even though each and every previous team has been very successful, “that doesn't offer any guarantees,” Sesink is keen to emphasize. “Of course it gives us confidence, but we still have to work just as hard as the teams before us and all the other teams taking part. The bar has been set high.” As to whether team 2018-2019, after the succession of developments and performances that have gone before, can still surprise? Sesink laughs mysteriously again, “I think it can”.


On March 1st Solar Team Eindhoven hopes to start on the production of its solar car, most of which will take place at Brainport Industries Campus, near Eindhoven Airport. “There we have a large hall, with a range of facilities, at our disposal where we can easily handle the large moulds we use to make the car.” But ultimately the planned new solar car will be assembled in the team's own workshop, in TU/e's Momentum building.

With twenty-seven members, the team that started this past September is a little larger than the previous team. Hardly a luxury in view of the new WSC rules mentioned above and the challenges they pose, says Sesink. As the provisional participants list, released this week, reveals, a little over twenty other cruiser teams from across the world are currently getting their teeth into these same challenges.

Read on below the photo.

Whereas some competitors, according to Sesink, have set to work using previously built cars, once again the team from Eindhoven will be creating an entirely new car from scratch over the course of nine months. And, as ever, that can't be done without external support. Thus an online crowdfunding campaign has been launched, giving supporters the opportunity to sponsor parts of the auto (ranging in round 1 from a solar cell to the headlights); in addition, since its formation, the team has been engaged in talks with potential industry sponsors. Because despite all the name-building already achieved, “you have to start talking to possible partners afresh every time”.

Not that the student team already had a full and clear story to tell in September, she admits. “But I see that as an advantage - it's what the companies themselves would find interesting that we want to be discussing. We want to take a close look at developments in the automotive industry and at, for instance, what startups like Lightyear and Amber are doing. In this way we are really trying to become part of the Brainport Region.”

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