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. 2019 May 2;10:2038. doi: 10.1038/s41467-019-09988-z

Table 3.

Input variables for the NPV expression

v p System Price of power components (in $ per kW)
v e System price energy component (in $ per kWh)
γ=11+r Discount factor based on the discount rate r (scalar)
T Useful Life of the battery system (in years)
x i Storage degradation factor (scalar)
η Round-trip efficiency factor of the storage system (scalar)
N Number of charge and discharge cycles per year (scalar)