Using representative numbers for the efficiency of the individual subsystems, estimate the size of

solar array required to provide $900$ W of regulated electrical power at end$-$of$-$life for a spacecraft in

$16$

Issue: $211/12/2023$

a $350$ km zero$-$inclination equatorial orbit. The mission lifetime is $4$ years. The array has the following

specifications:

Pointing accuracy: $\backslash$pm $5\backslash$deg

Efficiency decrease: $3\%$ per year

Secondary power system efficiency: $85\%$

Array efficiency at $0\backslash$deg : $15\%$

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

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

Operating temperature: $40\backslash$deg C

Solar flux in LEO: $1360$ W m$2$