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## Homework Statement

Calculate the solar array power capacity required at the start of the mission

- Mission duration is 10 years
- Distance from the Sun at end of mission is 4.8x[10][/8] km
- The power requirement for the spacecraft at the end of life is 510 W
- Solar array degradation over mission life = 30%
- Sun angle off normal = 45°
- Silicon solar cell efficiency at the spacecraft operating temperature = 12.5%
- Total power output from the Sun = 3.8x[10][/26] W
- The mass per unit area of a solar array is 2 kg [m][/-2]

## Homework Equations

Could only think of P(t) = [P][/o][e][/(-0.693t/[τ][/(1/2)])]

where P(t) is power at any given time, P_o is initial power, t is duration of mission and τ_1/2 is the time required for half of the power to be used up.

## The Attempt at a Solution

No real progress :(

help please