University of Manchester conducted a 5 month test project and has independently verified the quality and longevity of the ELe battery packs.
Assuming a linear capacity loss with cycle number then a worst case scenario is for a ‘day’ cycle consisting of a 10A 10 hour charge profile and overall computer loading of 750W for 7 hour, then the ELE-POD is predicted to be able to perform 2830 cycles before 80% capacity remaining is reached.
2830 cycles is equivalent to daily usage for almost 8 years. Or, assuming a UK school year is 195 days, the ELE-POD will reach 80% remaining capacity after 14 years and 6 months.
Accelerated capacity loss tests with a scaled ‘day’ cycle showed a marginal reduction in capacity loss per cycle if the cells are scheduled to start charging straight after the one hour balancing rest period at the end of discharging as opposed to delaying the charge to finish just in time for the balancing rest before the next discharge cycle.
Extrapolating to 70% EOL is with more risk as the assumed linearity may take the actual value further
from that predicted. Consideration might also be given to changing the BMS parameters to
accommodate ageing cells. Certainly monitoring individual cells and replacing them as necessary may
be a more cost effective way of prolonging battery health.
If 70% of the original capacity is considered EOL then 4244 cycles can be performed by the ELE-POD
of the ‘day’ schedule. This is equivalent to 11 years of continuous use, or 21 years and 9 months for a
UK classroom environment.
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