Telecom site DC battery backup single line diagram
This critical power single line diagram documents a telecom site DC battery backup system. Utility power is stepped down to an AC distribution panel, while an 80 kW standby generator can take over through a 200 A automatic transfer switch. The panel supplies a 30 kW rectifier plant that maintains a -48 VDC distribution bus.
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Scenario
This telecom shelter uses AC utility or generator power to keep a -48 VDC rectifier and battery-backed distribution bus available for communications equipment.
Key decisions
- AC transfer: A 200 A ATS selects the utility or standby generator.
- DC architecture: The rectifier and battery share a -48 VDC distribution bus.
- Battery reserve: A 600 Ah battery string carries DC loads during source transfer.
- Fused feeders: Radio, transmission, and controls have independent DC overcurrent protection.
- Load separation: RAN and backhaul equipment are shown as separate critical consumers.
When to reuse this
Use this for a small telecom shelter or tower equipment room with -48 VDC plant. Add site-specific battery autonomy and rectifier redundancy during detailed design.
Frequently asked questions
Why use -48 VDC at telecom sites?
What happens during a utility outage?
Are the fuse ratings final?
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