Supercapacitor experiments

Each cap can handle 2.7V long term, 2.85V short term. Balancer starts discharging overcharged caps through 1 ohm power resistor once they overshoot 2.8 - 2.85 V.

Self discharge current is expected to stabilize at relatively low value after 100 hours of being charged.

• Absorbtion current (initial)
• Leakage current (constant)

Replacing lead acid battery with supercapacitor

• UPS (replaced 12V 7Ah)
  • There is some inefficiency in conversion from 12VDC to 220VAC
  • UPS stops discharging at 10.2V (under load, which might translate to ~11V with no load)
  • 8W LED was running for over 5 minutes
  • 100W incadescent bulb was running for 30 seconds
• Piaggio scooter (replaced 12V 10Ah AGM, immobiliser has 3mA idle current)
  • Charges to 14.4V (in ~1 minute)
  • After sitting for
    • 9 hours voltage drops to 12.2V (cranks up)
    • 15 hours voltage drops to 11.2V (cranks up)
    • 22 hours voltage drops to 10V (cranks up)
    • 34 hours voltage drops to 8.2V (cannot crank up)