FablabSU

Meeting Date: 15-2-2022 Location: Polytechnique and Sorbonne Université People present: Stanislas, Lilit # of Hours: 3.5 hours (+ 1.5 hours from 8-2-2022) # of Hours Planned: 4 hours Total # of Hours YTD: 9 hours

Planned tasks to complete: The plan for the day was to: Understand how cells are electrically connected Complete IV measurement on cells Come up with module design - must be possible to create with low cost resources, accessible and efficient Inventory of module components

Summary of today’s meeting: Sizing of the panel, measurements based on voltage and size of the cell. About 20 cells will be needed if the voltage of the cell is 0.6V to receive 12V total. See below for the planned sizing. The height may need adjustments based on the bus wiring distance and exit wire connections.

Understanding how the cells are electronically connected. Connecting tab wire to the negative side of the cells Then to solder the negative side to the positive side Steps for this process was recorded in another file named “Steps for DIY PV” Understanding the bus wire connection and research on which material to use for the panel Inventory of module components: Available: Cells, flux pen, tab wire, bus wire Need: panel material (when chosen) front and back, frame, exit wires, diode Plexiglass is cheaper and transmits more, better insulation properties which make it resistant to intense sunlight and cold. Tempered glass has a longer life span and better resistance against hard-impact forces. The idea now is to use plexiglass, metal frame and resin or EVA as the back seal Action items: Plan for next week: Choose and order panel materials Begin IV measurements of good cells to be used for the panel Begin soldering the negative side contacts of the cells Verify the design sizing Planning for characteristic measurements