APBS writes out the electrostatic potential in dimensionless units of kb T ec-1 where
As an example, if you ran your calculation at 300 K, then the potential would be written out as multiples of kb T ec-1 = (1.3806504 × 10−23 J K-1) × (300 K) × (1.60217646 × 10-19 C)-1 = (4.1419512 × 10-21 J) × (6.241509752 × 1018 C-1) = 2.585202 × 10-2 J C-1 = 25.85202 mV |