The BOSS grain mill guarantees the possibility to obtain flour from different kinds of most common cereals (maize, wheat, barley, teff, millet, rice etc), spices and nuts from the sun energy! It is ideal for smallholder farms, rural communities, cooperatives or projects in places where no electricity grid is available. The efficient engine is run by an adapted Off-Grid solar system with high efficient solar modules and electronics and a battery storage to have power available at any time. The wooden mill is installed on a a stable structure with an aperture to easily fill a flour wagon or flour sacks. The mill funnel can be filled with up to 25 kg of cereals.