The load which is connected to the solar panel array in a solar
photovoltaic power generating system, draws continuous power
from it. The solar panel array and the battery are interfaced
through a charge controller which switches between on and off
states. The switching ripple of the charge controller contributes
to the power loss which depends on the solar array capacitance
(Kim et al., 2013; Kumar et al., 2006). Solar cell is a dc device,
which exhibits complex impedance and is affected by ambient
condition. Therefore, the knowledge of ac parameters of a solar
cell, their variation with respect to illumination and bias is important
as these parameters change with the duration of the day and
ambient temperature. The requirement of high power necessitates
the design of high performance power conditioning circuits to
match with the input at the operating condition as a mismatch
in impedances may lead to poor output. Therefore, knowledge of
solar cell impedance is essential to develop an efficient system.
Impedance spectroscopy (IS) is an important technique which
is, generally, used for characterisation of solid-electrolyte systems.
With this technique, dynamic behaviour of a device with a small