Eight solar dehydrator designs, ranging from $0 to ~$50.

1. Car-dashboard dehydrator. Zero cost, hot summer day.
2. Screen tray + dark surface. Lay screens on black asphalt or metal.
3. Cardboard box dehydrator with plastic wrap.
4. Window-screen tower — stacked screens with airflow.
5. Glass-fronted box with tilt and vent.
6. Double-chamber convection design — air intake below, exit above.
7. Solar-oven-style with reflector panels.
8. Hybrid electric-assisted backup design.

Search "DIY solar dehydrator plans" for specific build instructions. Free PDF plans abound.