An electric Little Free Library (eLFL) is a regular Little Free Library retrofitted with a solar PV panel, battery storage, and charging electronics. It is developed by students at UW-Madison in collaboration with the Great Lakes Community Conservation Corps (GLCCC). It serves as a way to provide free community access to clean electricity.
While currently focused on Madison, this project’s roots began with an initiative originating in Racine. The Great Lakes Community Conservation Corps (GLCCC) is an organization based in Wisconsin which works with veterans experiencing homelessness and disadvantaged youth by providing them job skills training. GLCCC recognized that often their trainees did not have a permanent residence and hence a safe place to charge their personal electronics. They identified a two-fold need: (1) community solar-powered charging kiosks for their trainees to charge their electronics for free; and (2) training the trainees to fabricate the kiosks to improve their job market potential and to serve as green ambassadors. GLCCC received a grant from the Wisconsin Office of Energy Innovation in 2021 to build these kiosks and they partnered with UW-Madison to get technical assistance on the prototypes.
To kick off this project, a makeathon (“Solympics”) was organized in Summer 2021 during which UW students made kiosk prototypes. A unique feature of this makeathon was that the GLCCC veterans participated as advisors to provide immediate feedback to the students, helping them devise contextually relevant designs. The winning team designed a Little Free Library (LFL) retrofitted with a small solar charging system called the electric LFL or eLFL. The design was developed into a field-ready prototype and was installed at the GLCCC facility in Racine, WI in March 2022.
Graduate students in the Energy Analysis and Policy program at UW studied the need, feasibility, costs, and benefits of such an eLFL for communities in Madison. They deployed a prototype at Lisa Link Peace Park, located on State Street in Madison for a month in the spring of 2022, collected data, and sought to provide a road map for future implementation of electric/solar-powered charging stations. Through meetings with local non-profits, elected officials, community experts, and end-users, they determined that there is a need for electricity and access to electricity for under-served individuals and communities. The prototype deployment led to daily uses of the eLFL (both for charging and books), meaning it is to deploy energy kiosks in areas of high need. The group concluded that the benefits of the eLFL (electricity access, resource sharing, information sharing) far outweigh the costs of the eLFL deployment and the project (time to seek permission, cost of the materials). More details can be found in their capstone project report.
Prototype Specifications:
- 50W solar PV panel
- 12V, 20Ah Li-ion battery
- 4 USB-A outlets
- multi-port charging cables to support phones of different makes
- Sensors:
- battery voltage, current
- load current
- temperature
- real-time clock
- door state (LFL door open/closed)
- Indicators: LEDs to indicate deep-discharge of battery
- SD card to log sensor data
The electronics for the prototype costs $300. For more details refer to this report.
Electric Little Free Library: Solar Kiosks for Energy Access – Graduate students in the Energy Analysis and Policy program at UW studied the need, feasibility, costs, and benefits of eLFL’s for communities in Madison. Their project report andf presentation slides are linked here:
(Listed in no particular order)
Faculty and Staff
- Giri Venkataramanan, Professor, Electrical and Computer Engineering, UW-Madison
- Lennon Rodgers, Director UW Makerspace
Graduate Students
- Maitreyee Marathe, PhD Student, Electrical and Computer Engineering
- Rebecca Alcock, PhD Student, Industrial and Systems Engineering
- Christian Martinez, Master’s Student, Electrical and Computer Engineering
- Brittany Bondi, Master’s Student, Environment and Resources
- Stephanie Bradshaw, PhD Student, Atmospheric and Oceanic Sciences
- William Keenan, Master’s Student, Public Affairs
Undergraduate Students and Student Organizations
- Gabriela Setyawan
- Savannah Ahnen
- Tricia Nazareth
- Varun Balan
- Engineers for a Sustainable World (ESW)
Partners
- Great Lakes Community Conservation Corps
- Little Free Library
- Wisconsin Office of Energy Innovation
Questions? Contact: Maitreyee Marathe – mmarathe [at] wisc [dot] edu
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- Watch now: An itsy bitsy solar-powered, phone-charging Little Free Library installed on Marquette Street
- Solar Little Free Libraries provide power to people who need it most
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