Computer Audio Asylum

Music servers and other computer based digital audio technologies.

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RE: Raspberry Pi 4 buying advice

Posted by AbeCollins on August 28, 2020 at 00:18:33:
Many of your questions are a just a matter of personal choice. Kit vs piece parts and what you already have on hand.
To determine the power draw you would need to know what all is connected to the RPi and if they get power thru the RPi. A USB disk, USB powered DAC, etc.
And as you know, just because a power supply is rated for 3-Amps doesn't mean that's what the whole system is actually drawing.
You might want to get a USB Power Meter. They have them for USB-C and placed inline with USB-C power to the RPi, it will show you the current draw and maybe calculate the power. Otherwise just multiply the current draw times the voltage (5V). From there you can calculate the approximate runtime based on your battery's capacity in Watt-Hours.