  The charge transport properties of zero-temperature multi-orbital quantum dot
systems with one dot coupled to leads and the other dots coupled only
capacitatively are studied within density functional theory. It is shown that
the setup is equivalent to an effective single impurity Anderson model. This
allows to understand the level occupation switching effect as transitions
between ground states of different integer occupations in the uncoupled dots.
Level occupation switching is very sensitive to small energy differences and
therefore also to the details of the parametrized exchange-correlation
functionals. An existing functional already captures the effect on a
qualitative level but we also provide an improved parametrization which is very
accurate when compared to reference numerical renormalization group results.
