Compadre is a social enterprise that empowers coffee farmers in the central Peruvian jungle by providing them with solar-powered technology to roast and sell their beans. Compadre purchases the roasted coffee from the farmers then packages and sells the coffee on. The aim is to provide the small coffee producers with a greater source of income, while reducing their ecological footprints.
The solar-powered coffee roaster uses a Scheffler solar concentrator and a roasting drum to roast coffee beans. The product works by using the reflection and concentration of the sunlight in a single focal point, where the roasting drum and coffee beans are located. This energy concentration brings the drum’s temperature above 200°C and coffee can be roasted without electricity or gas.
SDG 1: No Poverty
SDG 7: Affordable and Clean Energy
Target Users (Target Impact Group)
Small and Medium-sized Enterprises
Distributors / Implementing Organizations
Compadre provides small coffee farmers with the technology.
Direct competitors include Solar Hybrid Coffee Roaster.
The Roaster is made locally by the manufacturer for the farming communities identified by Compadre.
Intellectural Property Type
User Provision Model
Compadre provides small coffee farmers with the technology, along with training on how to roast their own beans.
Distributions to Date Status
In 2019, 18 farming families were using the Compadre Coffee Roasters to roast their product.
Roasting capacity (kg/hr)
3 – 4 kg/hr Interview with representative.
Roasting duration (hr)
0.33 hrs to roast 1 kg of coffee beans. Interview with representative.
Number of trays
No Interview with representative.
Operating temperature (°C)
220 oC max temp. Interview with representative.
The solar hybrid coffee roaster is composed of two main parts: the Scheffler solar concentrator and the roasting drum. The solar concentrator harnesses the sun’s energy and reflects it to a single focal point located in the roasting drum’s aperture. Inside the roasting drum, the coffee beans are located, where they receive the concentrated solar energy and reach temperatures above 200 °C in under 20 minutes. When clouds appear and decrease the incoming power, the roasting drums use electrical heaters to make up for the energy deficiency. These electrical heaters are powered by the photo-voltaic system installed in the location of the processing plant.
Provided by the manufacturer. Basic maintenance training is given to the users of the solar roaster.
Available from manufacturer. Interview with representative
The manufacturer estimates that some parts can last 20 years while others need to be changed every 2 or 3 years. Interview with representative
Manufacturer Specified Performance Parameters
Compadre aims to create better economic opportunities for coffee producers' families by increasing their income and creating a more ecological coffee chain. They aim to boost the value of small scale farming.
Vetted Performance Status
In 2019 the manufacturer worked with 18 families and estimates a 50% increase in their income as a result of Compadre's model. NESsT worked with Compadre in the technical and functional validation of its coffee roaster, and the coffee product quality has also been tested by Mikel Coffee. Interview with representative
Potential hazards related to the operation of this product include accidental burning.
Complementary Technical Systems
The Compadre coffee roaster comes with a 1.5 kWp photo-voltaic system with 600 Ah battery bank and a 2 kW inverter. Interview with representative
Academic Research and References
Hadzich, M., Veynandt, F., Delcol, J., Hadzich, L. M., Pérez, J. P., and Vergara, S., 2014, “Design of a Solar Coffee Roaster for Rural Areas,” Energy Procedia, 57, pp. 3215 – 3224.
Compliance with regulations
Compadre uses food-grade materials for the machinery parts that are in contact with the coffee beans. They have also acquired sanitary and health certificates for the roasted coffee. Interview with representative.
Watch videos of Café Compadre at Expo Live 2020 and an interview with one of the co-founders. Café Compadre’s Facebook page and Youtube channel. Product Video The coffee roaster technology is not for sale as Compadre’s business model is not based on machine sales, but on the coffee sales. Solar hybrid coffee roaster design specifications Basic maintenance training NESsT Mikel Coffee