5000W RMS Amplifier Design

flux

Here’s the estimate and practical sizing guidance.
Input current estimate
  • Output power: 5000 W
  • Efficiency: 85%
  • Input power ≈ 5882.35 W
  • 12 V input current ≈ 490.20 A
Recommendations
  • Main protection:
    • Size the primary overcurrent protection for the continuous draw plus inrush margin. For a single main device, target about 500–600 A, time‑delay, high-DC-interrupt rating. Example category: Fuse.
    • If you’ll use both +12 V inputs in parallel, place one device per feed and size each at about 250–300 A.
    • Include inrush management for the bulk input capacitors (NTC or active precharge) to avoid nuisance trips:
  • Wiring and terminals:
    • Total continuous current ≈ 490 A means ≈ 245 A per positive conductor if two +12 V feeds are paralleled (same for two returns). Verify the continuous ampacity of 4 AWG at your installation conditions; this current level typically necessitates moving to larger conductors (e.g., 1/0 or 2/0 AWG) or using multiple paralleled 4 AWG per polarity with short runs.
    • Use set‑screw blocks with ratings that meet or exceed the chosen conductor size and continuous current. See Terminal Block.
    • Keep cable runs as short as possible, minimize voltage drop, and consider copper busbars for distribution on the PCB enclosure side.
  • Remote turn‑on:
    • Route on a separate, low‑current connector away from the high‑current power feeds to avoid coupling noise.
Notes from best practices
  • Large input bulk capacitors will produce significant inrush; use soft‑start or precharge to control it.
  • When adding bulk capacitors, ensure their ripple current rating and ESR meet the converter’s requirements to avoid instability and overheating.
If you want, I can size the precharge components and propose specific fuse form factors once you confirm whether you prefer a single main fuse or one fuse per input feed.
Assume 10–14.4V range
Voltage drop target
Fuse type preference
Precharge sizing
Connector/terminal selection
boldincouncil123

boldincouncil123

@calculator redo the current for 10V and 14.4V input, same 5000W at 85% efficiency.
Thought for 28 sec
Thought for 10 sec
Running calculation.
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Audio Electronics | Copilot Preset twAH

Audio Electronics | Copilot Preset twAH thumbnail
Use this Copilot's template to design audio applications like amplifiers, mixers, processors, etc. Modify project requirement properties to adapt to specific needs.
#template #project-template

Properties

Audio

RoHS, FCC, CE

12V

-40 ºC to 85ºC

LED, Potentiometer

Bluetooth 5.0, 3.5mm Jack, Screw Terminals

Class D

Line-level from standard audio source

2 (stereo)

THD of less than 0.1% at full power

20Hz to 20kHz

Hz

Pricing & Availability

Distributor

Qty 1

Controls