Kawanda Solar Dryer

Why to choose this solution?
Preservation of agricultural produce is one of the central problems faced by small-scale farmers in Tanzania. Most frequently, horticultural crops in the markets spoil and some remain not harvested and left in the fields due to inadequate market. Poor infrastructure also increases time to get crops to markets and often results in crops being damaged. At the end of the growing season, the supply of crops diminishes until the next harvest. Solar dryer allows small-scale farmers to transform their harvest into storable and tradable goods, which they can sell off-season at higher prices.
Savings per day or production:
Avoids wastage of crops in particularly vegetables and fruits. Kawanda solar dryer can reduce wastage of a harvest surplus, allow storage for food shortages, and in some cases facilitate export to high-value markets.
Cost in money and in own time to construct:
Investment costs of solar dryers vary highly depending on the size of the solar dryer. Construction cost for solar dryer of 4-12 trays range from 1.3 to 4 million Tanzanian Shillings equivalent to US$ 565 to 1,740. The payback period for such dryers ranges from 2 to 4 years depending on the rate of utilization. About 2-5 days are needed to construct a Kawanda solar dryer of 12 trays, constructed using wooden materials.
8-10 years, unless visqueene plastic is punctured with sharp edges or damaged by sun after some time.
Maintenance needed:
Replacement of visqueene plastic whenever is damaged.
Resources needed in use:
Raw materials such as fresh vegetables, fresh fruits, etc can be used for drying. Materials should be well cleaned and chopped before being dried.
Problems and limits:
Drying process is considerably slowed down during cloudy or rainy season, unless the system is integrated with a conventional energy-based system. Many people are still unfamiliar with solar-dried products, which makes market promotion important.
Where and how can you get it or make it?
"Available in Tanzania, TaTEDO and other stakeholders have trained more than 50 local carpenters on how to construct, maintain the solar dryer and how to use the dryer and dried products."
Skills needed to produce, install. maintenance, use:
Short training needed on how to construct and maintain the solar dryer. Users of solar dryer need short introduction on how to use.
How to use it:
How to maintain it:
Climate effect (if any):
The energy input needed in solar dryer is less than what is needed to freeze or canning. Solar drying prevents food from decaying and spoilage which would have resulted into methane release to the atmosphere.
Where it is used and how many users are there?
Used by more than 1,000 farmers and entrepreneurs in Kilimanjaro, Arusha, Dar es Salaam, Tanga, Iringa and Morogoro regions of Tanzania.
Why is it successful?
Support services provided to entrepreneurs including capacity building through trainings and awareness contributed to the success. Existence of the Tanzanian Food Processors Association (TAFOPA), its objective is to promote womens entrepreneurship development in the food processing sub-sector through the improvement of existing micro enterprises managed by women, and the encouragement of new ventures with a potential to grow into SMEs.
If you can make it, a short description, typical problems, materials needed.:
Materials used for construction include timber/wood, visqueene plastic, Mesh-covered drying trays to hold the produce, iron sheet for construction of chimney.
How to make it (if possible):
Short training is needed on how to make it
How is it delivered and by whom?
Main actors of solar dryer include suppliers of agricultural produces, agro-processors, sales agents, development partners, end users. Awareness raising, demonstration and market promotion of agro-processed products through exhibitions, radio, newsletters, and other medias have been used to popularize and create demand for solar dried products.
Successful financial model
In most cases grants and loans have been used to cover initial investment costs. Operational and maintenance costs are covered from income generated through sales of the solar dried products.
What policies and strategies helped the success?
Tanzania Horticultural Development Strategy 2012-2021, Agricultural Sector Development Strategy (ASDS), the Agricultural Sector Development Programme (ASDP).
More info:
Manual on how to use solar dryer available at TaTEDO office, can be accessed through request email address: energy@tatedo.or.tz
Name of the association uploading the case:
TaTEDO, Centre for Sustainable Energy Services
When was the case uploaded? (YYYY-MM-DD):