Estimate the size of solar array required to provide $600$ We at end of life for a spacecraft in a

$430$ km earth orbit. Mission lifetime is $5$ years and the array has the following parameters:

Array pointing accuracy $\backslash$pm $5\backslash$deg

Efficiency decrease $3\%$ per year

Secondary power system efficiency $($battery charging$)85\%=0\mathrm{.}85$

Array efficiency at $0\backslash$deg C $15\%=0\mathrm{.}15$

Cell packing factor $0\mathrm{.}8$

Temperature coefficient $0\mathrm{.}1\%=0\mathrm{.}001/\backslash$deg C

Operating temperature $40\backslash$deg C

Solar flux at earth distance $1370$ W$/$m$2$