Which component isolates battery banks to prevent backfeed?

Which component isolates battery banks to prevent backfeed?

• A. Regulator
• B. Electronic Isolator
• C. Inverter
• D. Transformer

Answer: (B)

Isolating battery banks to prevent backfeed means stopping current from flowing backward from one bank into another while still letting the loads be powered. An electronic isolator does this with solid‑state switches or diodes that block reverse current. When a bank is supplying the bus, the isolator connects that bank to the load path and prevents the other bank from feeding into it. This keeps each bank independent unless needed, protects the batteries from cross‑charging or unintended discharge, and helps avoid fault propagation between banks. The regulator’s job is to maintain the correct voltage, not to prevent cross‑coupling between separate battery banks. The inverter converts DC to AC and may include safety isolation on its output, but it isn’t used to prevent backfeed between DC battery banks. The transformer handles AC voltage transformation and isolation within AC circuits, not the DC battery‑to‑battery isolation required to stop backfeed.

Isolating battery banks to prevent backfeed means stopping current from flowing backward from one bank into another while still letting the loads be powered. An electronic isolator does this with solid‑state switches or diodes that block reverse current. When a bank is supplying the bus, the isolator connects that bank to the load path and prevents the other bank from feeding into it. This keeps each bank independent unless needed, protects the batteries from cross‑charging or unintended discharge, and helps avoid fault propagation between banks.

The regulator’s job is to maintain the correct voltage, not to prevent cross‑coupling between separate battery banks. The inverter converts DC to AC and may include safety isolation on its output, but it isn’t used to prevent backfeed between DC battery banks. The transformer handles AC voltage transformation and isolation within AC circuits, not the DC battery‑to‑battery isolation required to stop backfeed.