Food Security Guatemala Project #29146

Solar Fruit Dehydrators for MicroEntrepreneurs

by Appropriate Technology Collaborative

Solar Fruit Dehydrators for MicroEntrepreneurs

Project Report | Feb 16, 2026
Faster Drying, Greater Capacity: Field Improvement

By John Bottenberg | Acting Executive Director, ATC

Back View

Project Report | February 14, 2026
Faster Drying, Greater Capacity: Field Improvements Confirmed
By John Bottenberg | Acting Executive Director, ATC

Since our last update, we’ve received encouraging feedback from the cooperative farmers using the newly installed third-generation solar dehydrators in Guatemala.

Performance Improvements in the Field

José and the team report that the updated design is performing significantly better than previous versions. The most important improvement has been replacing acrylic with glass in the solar collector panel. The glass retains heat more effectively, allowing higher and more consistent internal temperatures.

As a result, drying times have improved dramatically:

Oregano (Mexican mint/Cuban oregano): reduced from approximately 4 days to about 2 days
Banana slices: reduced from up to 1 week to about 2.5 days

This improvement not only increases efficiency but also reduces the risk of spoilage during extended drying cycles.

Larger Units, More Production

The new dehydrators are also larger than earlier models, providing additional tray space. Farmers can now process greater volumes of herbs and fruit at one time, increasing both food preservation and income potential.

According to the cooperative, the dehydrators are being used consistently. With faster turnaround times and increased capacity, the units are becoming integrated into regular production rather than occasional use.

Real Impact for Micro-Entrepreneurs

Dried herbs and fruits are being prepared for local sale, creating new revenue streams while preserving nutritious food for family consumption. Faster drying cycles mean:

More batches processed each month
More stable shelf-life for market products
Reduced post-harvest loss
Improved year-round food availability

These practical improvements strengthen the original goal of this project: equipping rural cooperatives with sustainable technology that supports both nutrition and income.

Next Step: Open-Source Drawings

The remaining milestone for this phase is finalizing the updated technical drawings. John Barrie will complete and publish the revised open-source plans once he has recovered from recent surgery. Making these finalized drawings available ensures that other communities can replicate and adapt the improved design.

We appreciate your continued support in helping small farmers transform sunlight into practical opportunity.

John Bottenberg
Acting Executive Director
The Appropriate Technology Collaborative

Front View

Side View

Banana Slices

Mexican Mint / Cuban Oregano

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Oct 20, 2025
Local Build, Real Results: Two Units Complete

By John Bottenberg | Acting Executive Director, ATC

The Completed Units

Following our June milestone announcing the completion of our third-generation solar dehydrator design, we’re thrilled to share that field fabrication and installation are now complete in Guatemala.

In August 2025, John Barrie worked alongside local carpenters to build and install two full-scale solar fruit dehydrators at a cooperative farm in San Lucas Tolimán. Each unit was fabricated locally using regionally available materials—an important step toward long-term sustainability and community ownership of the technology.

The new dehydrators have already been used to dry bananas, mangos, apples, and other crops, achieving steady drying performance even during overcast conditions. Farmers report that product quality and shelf life have improved significantly, reducing spoilage and creating new opportunities for income generation.

Key Highlights

2 solar dehydrators built and installed locally
Local carpenters trained on fabrication and maintenance methods
Cooperative farm testing under real production conditions
Dried fruit samples produced, packaged, and sold at local markets
User feedback incorporated into final engineering drawings

Our next steps include finalizing the open-source technical drawings and developing a simple “solar drying cookbook” to help micro-entrepreneurs turn harvested fruit into shelf-stable market products.

This progress marks a tangible leap from design to local impact—turning solar energy and community skill into sustainable livelihoods.

Next Milestones

Publish and share finalized drawings (December 2025 – January 2026)
Collect data on income generation and food-waste reduction
Plan training sessions for women entrepreneurs (2026)

Thank you for your continued support in helping small farmers turn sunlight into opportunity.

John Bottenberg
Acting Executive Director
The Appropriate Technology Collaborative

Drying Trays

Dehydrator Trays

Fruit on Tray

Ready for storage or Sale

Links:

The Appropriate Technology Collaborative Home Page

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Jun 20, 2025
Final Design Complete and Field Testing to Begin

By John Bottenberg | Acting Executive Director, ATC

We are excited to share a major milestone for our Solar Fruit Dehydrators for MicroEntrepreneurs project: the launch of our finalized third-generation solar dehydrator design. This innovation marks a significant step forward in our mission to provide sustainable food preservation technology to rural cooperatives in Western Guatemala.

Why This Matters
In Western Guatemala, nearly half of all children suffer from chronic malnutrition. This project directly addresses that crisis. Solar dehydrators extend the availability of nutrient-rich produce, reduce food waste, and generate year-round income for smallholder farmers. This means better nutrition for children, more stability for families, and new economic opportunities where they are most needed.

From Classroom to Community
Originally developed as a capstone design project at Michigan State University, our solar dehydrator has undergone rigorous field testing and continuous improvement. Our latest model integrates lessons learned over the past several years, with enhancements in durability, weather resistance, and usability based on direct feedback from Guatemalan families and farming cooperatives.

Design Improvements Include:

Robust Construction to withstand tropical weather conditions.
Improved Pest Protection through better screening and elevated platforms.
Streamlined Assembly for local build teams using available materials.

Next Steps
In July, we will assemble and install the finalized design at a cooperative farm in San Lucas Tolimán. The cooperative will use the dehydrator over the next two years, documenting the quantity of food preserved, nutritional impact, and additional income generated. This real-world data will help confirm design robustness and help make the design available to other customers.

ATC remains committed to building locally appropriate, sustainable technologies that improve health, support education, and generate income. We deeply appreciate your support on this journey and look forward to sharing the stories and results from San Lucas Tolimán in the coming months.

Thank you for being part of the solution.

With gratitude,
John Bottenberg
Acting Executive Director, The Appropriate Technology Collaborative (ATC)

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