eLi12+

The vehicle for the 2013 season

eLi12+ is the modified successor or eLi12.

The Shell Eco-marathon 2013 was the only competition we started in with the eLi12+. Thanks to the addition of solar panels, we managed a further improvement in efficiency, resulting in second place with a range of 957.75 kilometres per kWh or ca. 8580 km/l. This fuel economy was achieved through the integration of solar cells. Especially the wiring of the solar cells into two seperate modules with an MPPT each results in maximum efficiency of the panel even with non-optimal orientation towards the sun.

Technical Details

Key Data

  • Carbon Monocoque
  • Weight: 26 kg (ready to drive)
  • Maximum Speed, nominal: 30 km/h

Chassis

  • Carbon fibre reinforced plastic (CFRP) monocoque fabricated with Prepreg technology
  • Aluminium wafers as sandwich material
  • Weight without attachments: 8 kg
  • All attachments made from CFRP
  • Side windows made from Makrolon
  • Front window made from plexiglass

Power train

  • Lithium-Polymer accumulators as energy storage
  • Nominal power: 140W
  • Electric motor with energy recovery
  • Spur gear transmission
  • Monocrystalline silicium solar cells as energy supply
    • Two solar modules with one MPPT each

Electronics

  • De-central design using a CAN-bus for communication between controllers
  • Self-developed wiring harness
  • Android Smartphone with custom app
    • Shows live data to driver
    • Communication to driver

Running gear

  • 3 wheels for reduced rolling friction
  • Custom-designed and custom-made tubeless CFRP hollow chamber rims
  • Rear wheel steering (awarded the Technical Innovation Award, SolarRace Región de Murcia 10/2012)
  • Steering connected via bowden cable
  • Aerodynamically optimised front axle design
  • Hydraulic disc brakes
  • Magnesium brake calipers
  • Aluminium steering arm with integrated electronics