437641.fig.003a
(a)
437641.fig.003b
(b)
437641.fig.003c
(c)
437641.fig.003d
(d)
Figure 3: (a) Output current of RCP circuit in weak sunlight intensities with varying pumping frequency. (b) Output current in moderate sunlight with varying pumping frequency. (c) Output current in strong sunlight with varying pumping frequency. (d) The pumping frequencies at MPPs with varying sunlight intensity from 1.5 mA to 58 mA.