2.8. Exercises
2.8.1. Characteristic of a photovoltaic panel
A photovoltaic panel is formed of two modules, which are connected in parallel. Each of these modules is made up of 24 cells, which are connected in series. The characteristic of a cell is given in Figure 2.70.
a) Draw the current—voltage characteristic (i–v) of such a generator.
b) What is the short-circuit current of the panel?
c) What is the open-circuit voltage of the panel?
d) What is the peak power?
Answers
a) A module is made up of 24 cells in series. The voltage of a module is thus the sum of the cell voltages and the drain current is the maximum current delivered by a cell. We thus have an equivalent generator of 12 V – 2 A.
A panel is made up of two modules, which are connected in parallel. The voltage of a panel is the voltage of a module and the current is the sum of the maximum module currents. We thus have an equivalent generator of 12 V – 4 A (Figure 2.71).
b) The sort-circuit current Icc of the panel is 4 A (Figure 2.71).
c) The open-circuit voltage Voc of the panel is 12 V (Figure 2.71).
d) At the Maximum power output point, the voltage Vm is worth 10 V and the current Im is worth 3.48 A (Figure 2.72). The peak power P ...
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