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I'm working on a Raspberry Pi 4 NAS server and I found a power supply (5v 3A) on aliexpress:

https://s.click.aliexpress.com/e/NedqZhCc

Is the power supply going to be capable of supplying my NAS server, if not, what should I be looking for?

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Your cheapie power supply looks OK. You might like to read the following article just to make sure.

How much power does the Pi4B use? Power Measurements - RasPi.TV 2019jun25

https://raspi.tv/2019/how-much-power-does-the-pi4b-use-power-measurements

In case you are considering UPS, here are some references:

Raspi UPS HAT Board

http://www.raspberrypiwiki.com/index.php/Raspi_UPS_HAT_Board

http://www.raspberrypiwiki.com/images/6/6f/How-to-use-via-i2c.pdf

https://www.youtube.com/watch?v=n2amD_gU4A4

Of course you can consider the official power supply. But they are much more expensive:

Testing Official Rpi4 PSU

https://www.raspberrypi.org/forums/viewtopic.php?t=243942

I don't like wall warts, so I am using this desktop version:

XiaoMi CDQ06ZM PD 60W 6-Port USB-C Desktop Charger (18W PD Port x 1, 18W QC Port x 1 and 2.4A Ports x 4)

https://www.amazon.com/Chargers-Xiaomi-Charging-Charger-Universal/dp/B07MDRFM3Q

https://uae.digshop.com/products/xiaomi-power-delivery-60w-6-port-usb-c-desktop-charger/

And this discussion is good.

Choosing a Pi4 power supply - 2019jun

Choosing a Pi4 power supply

I don't know how power hungry is you NAS drive. You might like to read my answer to the followng question to get a rough idea of the problems with HDD and SSD.

Can the 3b+ power two usb SSD drives?

Can the 3b+ power two usb SSD drives?

Actually QC3.0 Charger is usually OK for Rpi4B.

Can I power 2 raspberry pi 3 B+ using a USB hub?

can i power 2 raspberry pi 3 B+ using a USB hub?

.END

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