Taking into account the context of rural sector, the technology should be kept simple and robust, involve material easy to find locally, so as to facilitate construction, operation and maintenance of the process. In this context the Scheffler reflector is chosen for being a good solar concentrator. Indeed, the Scheffler reflector is open source technology, which means anybody can copy it without paying for a patent. This is considered as a key advantage in the scheme of the project. The Figure 2 shows the Scheffler concentrator of 2.7 m2 of mirror surface used for the roasting experiments.
The Scheffler concentrator requires only one axis trac king and is mechanically balanced on this axis. This makes manual tracking easy and automatizing it needs only one single small motor. As open- source technology, extensive documentation on the characteristics and construction details of the Scheffler reflector are available online.