Answer
See answers.
Work Step by Step
Each cell outputs a voltage of 0.80 volts, so to build up to 120 volts, the cells need to be in series.
The number of cells needed to output 150 volts is $\frac{120V}{0.80V/cell}=150 cells$.
The current put out by this series combination is still 350 mA, the output of an individual cell. To reach 1.3A of current, we can place sets of 150 solar cells in parallel with each other. The voltage would be 120 volts, and the currents would add.
The number of sets needed to output 1.3A is $\frac{1.3A}{0.350A/set}=3.71\;sets\approx 4\;sets$.
The total number of cells is 4(150) = 600.
Calculate the required area.
$$600(0.03m)^2=0.54m^2$$
In summary, 4 sets should be wired in parallel, each consisting of 150 cells in series with each other.
This will produce 1.4 A at 120 V.
