Project idea © Ingrid Schubert 2011 Nowadays the emphasis is placed more and more on ecological means of transport.  That’s why the pedelec is used increasingly in the streets. The aim of the project  “Photovoltaic Power Plant for Pedelecs – 4P” is to build a solar powered charging station  for pedelecs and to combine it with a hire station. Also there will be a test rig for  pedelecs. We decided to split the project in two separate areas. The first team will  implement the construction of the test station, while the second group will build the  charging- and the hire-station. The project will be presented at the end as a unit, but it is  also a presentation of  two individual projects possible. In the long run it might be  conceivable to present the whole project in bicycle shops for example. The solar  charging station should show, that it is possible to charge the build in battery of the bike  in an environmental friendly way. An LED-display and our own physical experience will  show the effect of the electric supported ride. The alteration will refer to the DIN EN  60204-1 (VDE 0113-1). Furthermore it will be possible to establish the charging station  in combination with the hire station in cities. The request for hiring a pedelec should be  possible by sending an SMS. To present the benefit of pedelecs, a test station will be  build additionally. This should demonstrate how the electric power system supports the  pedalling and affects the driving behaviour.  2. Voltage ratio between the single components 3. Explanation of the voltage ratio  A voltage of 12 V DC is triggered through the solar radiation. This voltage is conducted  to the outer switching cabinet first and from there it is triggered further to the main  switching cabinet through electrical lines. The 12V are, on the one hand, converted in  the control box with the help of a DC/DC converter in 24 V DC and are, on the other  hand, used for charging the back-up batteries. The 24 V DC serve for the voltage supply  of PLC (ILC 150 GSM/GPRS) and the touch panel. Furthermore, a voltage of 36 V DC is  created in the control box which is necessary for loading the pedelec. In order not to be  dependent on the solar radiation, it is possible to charge the unit with a 230 V AC  voltage from the default network.  4. How is the solar station incorporated in the concept?  Should a customer want to hire a pedelec at location A, his way leads to the combined  solar charging station with joined hiring booth. If there is a charged bicycle at the station,  the customer is given the possibility to hire this bicycle on the touch panel. The request  for hiring a pedelec can be entered by the customer directly on the touch panel. The  customer will receive a confirmation that the bicycle can be taken from the hiring booth  by sms. Now the customer can take the bicycle and can return it at another charging  station if applicable.  5. Which distinctive features are there in our bus system?  First of all, an overview of the bus system with all components  The test station The test station serves for the demonstration of the energy which is effective with the support of the electric motor in the pedelec. The pedelec is assembled to a cycle trainer. To this, in turn, a generator is connected that creates voltage. The voltage varies between 0 and 10 V DC according to how strong you pedal. The adduced voltage is processed by the SPS and shown on the LED display accordingly. The stronger one pedals, the more LEDs light up. By connecting and disconnecting the electric support, one can experience how strong such support can be. By means of the brake at the generator an up-hill drive can be simulated. How does the test station work? The test station functions as follows: One mounts the bicycle which has been put into a cycle trainer and pedals. The back wheel activates a connected generator. This generator creates an initial voltage between 0 10 V DC. The initial signal of the generator is captured by an analogous front-end interface of the SPS. Subsequently, it is converted by the SPS accordingly so that the signals necessary for the LED display can be sent to the digital output interface. Amongst others, the initial voltage should be shown on the touch panel. Further data are, for example, efficiency created, driven time, etc. With the brake connected to the generator, an up-hill drive should be simulated. By means of the control unit, the strength of the brake can be set. Here it can be very well demonstrated and experienced what the support of the motor can produce in everyday life.