Additional steps taken:
- Enabled Atmega328P's BOD at 1.8V level to enable usage at 3.3V or lower voltage
- Use of 5V LDO between solar panel and supercaps
- Supercaps in series with 5.4V (only 5V max used) and 5F as result
- Use of 3.3V LDO between solar panel and supercaps
- Test with renewed hardware using a standard blink sketch
Details of progress in main text of project.