a) Connect 8 modules in series to obtain 256 volts. It is not too much since exceeds the required value by less than 3%. To obtain a current of 2 A, we can connect seven such series arrangements in parallel, which will give 2.1 A of output current.
b) The power of each module will be
The power of each of the series chains:
The power of the array (seven series chains connected in parallel):
c) The number of cells in one module: