In my case it is 110 seconds.
I believe this was mentioned before, but I cannot find it. How many cycles are the ultra capacitors rated for?
The cycle life of the particular model of ultracap used in LIO is rated at 0.5 million cycles by the manufacturer, however
, that is based on far more aggressive usage such as:
- Charging the cap to its rated voltage (which we do not do in LIO)
- Discharging the cap down to 50% of the max rated voltage (which we do not do in LIO)
- Much higher discharge and charge currents (which cause higher internal temps).
And keep in mind that the manufacturer of the ultracap considers "end of life" when the capacitance value drops by 20% compared to a brand new cap. So it is not like the cap just "dies" after a certain number of cycles. It will continue to work just fine in our application...
even if the capacitance ever dropped by 20% over many years of use.
Back in 2014 when I was developing LIO and speaking with the engineers of the ultracap company, they mentioned my application is significantly gentler than the conditions that they used when they came up with that 0.5 million cycles figure, and could only guess that the cycle life in LIO would easily be > 1 million cycles.