Power Policy

Overall: PASS

• Released orbit: 600.0 km circular SSO at 97.8 deg
• Orbit period: 5760.0 s with worst-case eclipse fraction 0.400
• Architecture: sunshield-integrated annular solar blanket with dual lithium-ion battery modules and regulated 28 V PCDU
• Released total power budget: 650.000 W
• Allocated load sum: 612.000 W with 18.000 W PCDU housekeeping
• Sizing regulated load used for closure: 650.000 W

Solar array sizing

• Deployed surface: sunward face of the outer sunshield annulus
• Active area: 5.100 m^2 against 5.123 m^2 available at 0.700 coverage
• String layout: 20 strings x 30 cells at 70.500 V/string
• BOL array power at design incidence: 1516.357 W
• Radiation-derived EOL power retention: 0.898 against released minimum 0.880
• Regulated solar-bus power at EOL: 1279.560 W

Battery eclipse closure

• Battery chemistry: lithium_ion_nmc
• Nameplate battery energy: 1382.400 Wh
• End-of-life usable energy to loads: 955.515 Wh
• Worst-case eclipse load energy: 416.000 Wh over 0.640 h
• Recharge power required during sunlit arc: 465.349 W
• Orbit-average regulated solar-bus requirement: 1115.349 W

PCDU concept

• Architecture: dual-fault-tolerant MPPT regulated 28 V distribution unit
• MPPT channels: 4 | Battery charge channels: 2 | Load-shed channels: 8
• Max solar input: 1800.000 W at 120.000 V
• Max regulated bus power: 900.000 W at 28.000 V
• Max battery charge power: 600.000 W

Checks