3. Calculates the annual net cost savings of not having to launch this mass for the Powersat case. 4. Calculates the cumulative savings over various periods of time. 5.4 Assumptions For the purposes of this preliminary analysis, the following assumptions have been made for both Powersat options: For Propellant Calculations • The Powersat allows the propellant requirements to be reduced by 40% relative to the 75 kW Freedom propellant needs to reflect the reduction in solar array size but also takes into account the small drag increase due to the rectenna, • The propellant needs for the 75kW version are defined in Section 4.1.1. For Battery Calculations • The average power outage per year is 5%, • The average loss of coverage per orbit is 10%, • Battery replacement mass and rate are defined in Section 4.1.1.
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