The PowerCore SunCruiser is a solar-powered road vehicle. It was created at the

Bochum University of Applied Sciences Bochum ( , also , ; wep, Baukem) is a city in North Rhine-Westphalia. With a population of 364,920 (2016), is the sixth largest city (after Cologne, Düsseldorf, Dortmund, Essen and Duisburg) of the most populous German federal state of North ...

to compete at the World Solar Challenge in 2013. The PowerCore SunCruiser is the fifth vehicle built by the University of Bochum and categorized as an EC vehicle class L7e, which includes full road approval. The car was presented to the public on 25 July 2013. It offers space for three persons, can reach a top speed of over 100 km/h, and is driven by two wheel-hub motors in the back wheels. Its maximum power is 8.5 kW. The vehicle's empty weight is around 340 kg, of which the batteries take around 63 kg. The range on a fully charged battery in the absence of sunlight is 700 km when driven at a uniform speed of 65 km/h. Its multi-layer solar cells operate at 29.7% efficiency. The performance of the 3 square meter solar cells on the roof is 833 W.

Batteries

The accumulators make use of 1316 Panasonic NCR 18650B lithium-ion batteries. For the model driven at the World Solar Challenge in 2013, the battery had a total weight of 63 kg and was able to store 15.9 kWh of energy, achieving a nominal voltage of 100.8 V.

Solar cells

Tandem solar cell Multi-junction (MJ) solar cells are solar cells with multiple p–n junctions made of different semiconductor materials. Each material's p-n junction will produce electric current in response to different wavelengths of light. The use of multiple ...

s consisting of

gallium arsenide Gallium arsenide (GaAs) is a III-V direct band gap semiconductor with a Zincblende (crystal structure), zinc blende crystal structure. Gallium arsenide is used in the manufacture of devices such as microwave frequency integrated circuits, monoli ...

are used. On the roof are 944 cells, which can deliver a voltage of 2.28 V and a current of 0.47 A. The maximum

efficiency Efficiency is the often measurable ability to avoid wasting materials, energy, efforts, money, and time in doing something or in producing a desired result. In a more general sense, it is the ability to do things well, successfully, and without ...

of a cell is 29.7 %. In order to achieve this degree of efficiency nine different

MPPT Maximum power point tracking (MPPT) or sometimes just power point tracking (PPT), is a technique used with variable power sources to maximize energy extraction as conditions vary. The technique is most commonly used with photovoltaic (PV) solar sy ...

s (maximum power point tracker) are used. The overall electrical performance of the array is 833W.

Motor

The motor is a development of the Bochum University of Applied Sciences. The permanently excited synchronous machine develops a maximum torque of 110 Nm and a nominal torque of 16 Nm.

Race

World Solar Challenge

The vehicle was specially built for the World Solar Challenge 2013 (WSC 2013), 6 October 2013 that took place in Australia. It started in the so-called "Cruiser-class", which, according to a progenitor model from Bochum - BOcruiser. This class segment emphasised the practicality of the vehicle as a daily commute with the development of solar energy in the focus. For the first time, a solar car from Bochum crossed the goal of 3,000 km without a glitch through the Australian Outback, and was at the end, world vice-champion. The University of Bochum reported the WSC 2013 race participation in a journal.

The European Solar Challenge

In October 2014 the PowerCore SunCruiser together with the previous model and the "Weltumrundler" SolarWorld GT took part in the MacCready Solar Challenge (ESC). This took place in Zolder, Belgium, on the former Formula 1 race track. The SunCruiser took first place and became European champion in 2014. The car won the endurance category race in about 9 hours and reached the second-fastest lap. Diary entries, pictures, galleries and videos by ESC 2014 are on the solar car web site of the

University of Bochum The Ruhr University Bochum (, ) is a public research university located in the southern hills of the central Ruhr area, Bochum, Germany. It was founded in 1962 as the first new public university in Germany after World War II. Instruction began in ...

The Team

The racing team was made up of around 30 students, and also involved students who designed and built the vehicle. The team was sub-divided into groups having individuals specializing in different aspects of the development of the vehicle and the organizers.

References

{{Reflist Solar-powered vehicles