Page 195 - Intro to Space Sciences Spacecraft Applications

182 Introduction to Space Sciences and Spacecraft Applications
Cleft GaAs Gallium arsenide
GaAsCuInSe2 Gallium asenide copper indium selenium

Select the Battery Qpe: Drives the specific energy density (mass),
and depth-of-discharge (DOD) of the batter-
ies based on the battery database (Table 8-6).

NiCd Nickel-cadmium
NiH2 Nickel-h ydrogen

Once the input conditions have been satisfied, the power subsystem
designer calculates the basic functional values of the system in the fol-
lowing manner:

solar Panel Area (m2> =
(BOL Solar Panel Power) x (Area Scaling Factor)
(Solar Cell Wattlsq meter)

Solar Panel Mass (kg) =
(BOL Solar Panel Power) x (Mass Scaling Factor) (8 - 2)
(Solar Cell Kg/sq meter)

The minimum number and mass of the batteries is calculated based on
the energy storage needs. The number of batteries may be increased for
redundancy.

Min. Number of Batteries =
(Total WH Stored)
([Bus Voltage] x [AWBatt]) (8 - 3)

Battery Mass (kg) =
(Bus Voltage) x (AWBatt) x
(Num of Batts) x (Batt Mass to Power Density) (8 -4)

The mass of the power control and conditioning systems is based on a
percentage of the power produced.

Power Control Unit Mass (kg) = 0.02 x (Day Power) x 2 (8 -5)