Solar stereo cube
The CCAT solar stereo system was designed and constructed by four students from Humboldt State University during the Spring 2021 semester for class ENGR 305 Appropriate Technology. This project was built for the Campus Center for Appropriate Technology (CCAT) to play music for volunteer days and special events using only solar power. We used a prebuilt bluetooth speaker and powered it using three 15W solar panels. The system is contained in a single structure that can be rolled around for convenient use and storage.
Includes: Three solar panels in parallel to meet the current needs of the stereo, and simple voltage regulator to meet the voltage needs (which was an awkward 15V) of the stereo unit. The rest, including the battery, is built into the stereo.
You can read more about the design at https://www.appropedia.org/CCAT_solar...