[Caesar Soze]

(m^2 / 406 W) * (2300 W) ~= 5.7 m^2

Not 60 m^2. Where is the error?

[AdamSelene235]

(m^2 / 406 W) * (2300 W) ~= 5.7 m^2 Not 60 m^2. Where is the error?

You left out the 10% efficiency of the Si cells and so you need to scale the area of the cells by nearly 10X.