Raspberry Pi 5 undervoltage warnings when servos move despite high-power battery supply

[ShrutiMakawana]

Describe the bug
Raspberry Pi 5 reports undervoltage warnings when servos start moving, even though the system is powered using a high-power UGREEN 300W power bank

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To Reproduce
Steps to reproduce the behavior:

1. Power Raspberry Pi 5 using UGREEN 300W 48000mAh power bank via USB-C (140W PD port)

2. Power two Waveshare servo driver boards separately using the remaining 100W USB-C ports through USB-C to 12V barrel adapters

3. Connect:

   • 17 servos total (9 + 8 configuration)
   • Intel RealSense camera
   • Anker USB hub
   • 2 additional cameras

4. Start moving multiple servos simultaneously with cameras

5. Raspberry Pi reports undervoltage warnings (Undervoltage detected!)

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Expected behavior
Raspberry Pi 5 should maintain stable power without undervoltage warnings during servo movement.

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Screenshots
If needed, I can provide:

• undervoltage warnings
• power setup photos

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Desktop (please complete the following information):

• OS: Raspberry Pi OS
• Device: Raspberry Pi 5
• Power Source: UGREEN 300W 48000mAh Power Bank

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Additional context

Current power architecture:

• Pi powered directly from 140W USB-C PD port
• Two Waveshare servo driver boards powered separately from two 100W USB-C port
• USB connection between Pi and camera and servo drivers is used only for data communication

To mitigate the issue, I added:

• XY-3606 DC-DC buck converter (24V/12V to 5V 5A)
  Also 2200 uF capacitor on both servo drivers power input

New setup:

*UGREEN power bank 140W port -> Type c to 12 Barrel Jack connector -> buck converter -> Type c two wired cut -> Raspberry pi

This significantly reduced undervoltage events, but occasional warnings still occur during heavy servo activity.

Important observation:

• Using the official Raspberry Pi 5 power adapter (5.1V/3A) does NOT produce undervoltage warnings.

Would appreciate guidance on:

• Recommended power architecture or solution

[ShrutiMakawana]

Can Please anyone help regarding this issue ? Thank you !