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--- projects:blinker:work_logs:8_solar_cells [2022/04/02 06:54] – tjhowse
+++ projects:blinker:work_logs:8_solar_cells [2022/04/04 00:31] – tjhowse
@@ Line 53: / Line 53: @@
 ==== Success again ====
-Once I got my [[projects:laser_cutter:overview|laser cutter]] set up, things started to improve again.
+{{:projects:laser_cutter:pasted:20220331-000734.png}}
-===== Video =====
+Once I got my [[projects:laser_cutter:overview|laser cutter]] set up, things started to improve again. I collected all of the bigger bits of the failed previous attempts and shot lasers at them at varying intensities, movement speeds and number of passes. I settled on 2 passes at 70% power on my 80W CO2 laser tube moving at 50mm/s, lasering the backside of the cells. This caused the seam to bend upwards slightly providing a guide for the crack.
+{{:projects:blinker:work_logs:pasted:20220403-060140.png}}
+First attempt. Note the cut is approximately parallel to the fine white lines.
+{{:projects:blinker:work_logs:pasted:20220403-060227.png}}
+More success.
+{{:projects:blinker:work_logs:pasted:20220403-060040.png}}
+Repeatable results.
+{{:projects:blinker:work_logs:pasted:20220404-002747.png}}
+Soldered up one five-cell array.
+I used some fine copper wire to join the cells. I used leaded solder, a chisel tip, Chipquik SMD291 flux and 270ºC. I dipped the wire in the flux and laid it across the contact on the panel, wet the iron tip with a good amount of solder then swept across the copper while I held it in place. Once I got my technique sorted it was pretty straightforward.
+Holding this cell in diffuse sunlight gave 2.7V open circuit voltage.
+===== Videos =====
 Failure:
@@ Line 65: / Line 83: @@
 {{ youtube>E3jePteZ7Yw?large }}
+{{ youtube>DGBrjxjcLxw?large }}
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