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Last edited: 3 October 2025
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The ULOG 1.0 solar box cooker
The ULOG 1.0 is a solar box cooker developed by the group, ULOG Freiburg, in the early nineties. It is a cooker that was designed to work primarily in the locations close to the equator, as it solar orientation is fixed pointing upwards to an overhead sun.

The ULOG Standard-size and ULOG Family-size solar cookers have been Performance Evaluation Process (PEP) tested by Solar Cookers International.
- PEP results and the full report for the Standard-size ULOG 1.0
- PEP results and the full report for the Family-size ULOG 1.0
They made available a comprehensive set of build instructions for those wishing to make their own. They also sell a model called the ULOG Light which is a more versatile design, and is available in kit form.
Audio and video[]
- December 2022:
First Construction Of The ULOG Cooker In Hinche Haiti.-2
The ULOG 1.0 Cooker is demonstrated by Elie Joseph
Documents[]
- ULOG 1.0 construction manual (English)
- April 2023: ULOG Solar Box Cooker construction manual update for tropical areas (English)
