To estimate the power outputs, polarization curves were drawn
during stable phase of SBES operation (on 20th day). The cell
design point (voltage change region) of a particular fuel cell system
can be obtained by considering the point at which highest PD
noticed on the polarization curve intersects with voltage and CD
(Barbir, 2005). Polarization curve documented e discharge at
5kO on 20th day of operation (Fig. 2b).