Works free and holds more than electric.
Construction
Wooden box with angled glass lid. Black bottom. Mesh shelves. Bottom-to-top ventilation.
Principle
Sun heats black bottom. Hot air rises, draws fresh air below. Moisture carried out. 50–70°C inside.
Effectiveness
Apples 1–2 days. Tomatoes 2–3. Herbs half a day. Cost $20–50.