Elecrical Power System A320 Family 

Yes i agree .

DC ESS correctly said that is fed by the DC BAT, but DC BAT is fed in normal operation by the DC 1

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Since summer 2018, two 28Ah rechargeable batteries are being fitted on Airbus’ A320 single-aisle jetliners. They will provide safe and reliable power to start the auxiliary power unit, as well as emergency backup for critical systems. On the ground, the batteries have an automatic cutoff logic that prevents them from being completely discharged. In flight, battery endurance is approximately 22 minutes

There are two types of electricity. Alternating Current (AC) and Direct Current (DC). Both are completely different and both do have some common gadgets, like a light bulb, which can work without any difficulty. It is important to understand that the AC (normally a single phase) has only one live wire called 'a phase' and the other one is a neutral wire which is ideally a zero potential charge.

APU Generator has Altitude restrictions. FL250 and below above that if you wanna start, you need either of the engines to work. That’s when the emergency generator comes into play.

APU would be a good idea depending on the Airbus A320 altitude but it takes some time up to start, thus RAT comes in scene.

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In Aircrafts, the electrical system is primarily an AC system. Aircraft electrical components operate on many different voltages both AC and DC. However, most of the systems are 115 VAC with 400 Hz, 28 VDC and 26 VAC is also used in aircraft for lighting. AC power is received from an IDG Integrated Drive Generator which supply three-phase 115/200 V 400 Hz constant-frequency The DC power generation : AC output from IDG is fed to a transformer rectifiers, which convert the AC voltage into 28 VDC DC is also supplied from a battery installation. The battery provides 28 VDC.

@@AviaLearn thank you for explain !

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EPGS: Electrical Power Generation Distribution System. EEPGS : Enhanced Electrical Power Generation Distribution System

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Bob?

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Una mejor pregunta es: ¿porqué no entiendes Ingles?