I am trying to understand how SAM calculates calendar degradation using the empirical Calendar Degradation for a Lithium-Ion LFP battery. Supposedly the equations below are used to calculate degradation, however when I try to replicate this calculation with the same equation and variables it gives me different results than the ones shown on the graph.
Looking into the code, the constant "0.00266" is supposed to have "1/sqrt(day)" units, however at a first glance it seems that for the graph values, hours (days*24) are used for the calculation instead of days. For the blue and red curve with moderate SOC, using hours gives me approximate values to the ones shown on the graph. But for the high SOC cases, green and yellow, days gives me the result shown.
I would like to understand if I'm making any mistakes or why this is modelled like such.
Thank you