Calculating Lithium-Ion Battery Size for 90KVA 200/115V 400Hz 3-Phase AC System

The discussion focuses on sizing lithium-ion batteries to power a 90 KVA, 200/115 V AC, 400 Hz, 3-phase avionics system. The original approach resulted in oversized battery capacity due to not accounting for conversion losses and actual load demand. The system’s full load is 90 KVA, but actual steady-state load may be lower (e.g., 45 KVA), which should guide battery sizing. Power factor (0.9 assumed) and average power consumption (~81 kW) are key parameters. Battery sizing depends on required backup duration before commercial power restoration. Conventional solutions for emergency backup in such high-frequency avionics systems typically involve diesel generators coupled with 400 Hz motor generators rather than large battery banks, due to complexity, size, and cost. A hybrid approach using a UPS with a generator can reduce battery size by covering only the transfer time. Reference to FAA Advisory Circulars is suggested for compliance with avionics emergency power requirements.
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