blueagent004
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Joined: Fri Oct 19, 2018 1:21 am

will Raspberry Pi 3 fry if i use a 5V/850mA power supply?

Fri Oct 19, 2018 1:40 am

i've read on the official wiki that a 5V/2000mA power supply is recommended for the Raspberry Pi 3 model B+.

so a month ago i ordered a USB power adapter on ebay which matched this criteria.

today i got the package but apparently the seller sent me an under-powered usb adapter of 5V/850mA

i need to test my brand new raspberry pi3 to see if it's working or not, i waited and waited for that darn new usb power adapter from ebay and now i've been sent the wrong one.

so can i just use the 5V/850mA usb power supply to just do a simple, one-time test to see if my brand new raspberry pi3 is working or not?

i won't be using it for long, i just need to test the Pi3 to see if its working or not, i've already ordered another 5V/2000mA power supply from another seller on ebay but it won't arrive for another month, i'm sick and tired of waiting, i'm so, so sick and tired of waiting like this, i feel the urge to just use the 5V/850mA adapter i've received to test my Pi3 but i'm worried that the low power will damage my pi.

would someone please be so kind as to let me know if i'll break my raspberry Pi3 if i use the 5V/850mA adapter to test it?

thank you so very much for your help!
Last edited by blueagent004 on Fri Oct 19, 2018 3:48 am, edited 6 times in total.

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ksharindam
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Re: will Raspberry Pi 3 fry if i use a 5V/850mA power supply?

Fri Oct 19, 2018 2:51 am

Using underpowered Raspberry pi will not make any damage to the raspberry pi. It will fry the raspberry pi only if the output voltage is greater than 5.25 V.
I used a 700mA power supply for my raspberry pi 2 for a long time.
If you connect power hungry device (such as USB modem) through USB port of the raspberry pi, the Pi will reboot.
My Qt projects at ... https://github.com/ksharindam

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Imperf3kt
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Re: will Raspberry Pi 3 fry if i use a 5V/850mA power supply?

Fri Oct 19, 2018 2:53 am

You will be okay using that to test your Pi works, but it will probably be unstable and crash.
It won't hurt your Pi, but it may hurt the SD card.

In my experience, it should work fine if it actually delivers the full 850mA to the Pi, but don't plug too many USB peripherals in.
Stop plugging your fan directly into the GPIO 5v
https://www.electronics-tutorials.ws/power/transient-suppression.html

blueagent004
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Re: will Raspberry Pi 3 fry if i use a 5V/850mA power supply?

Fri Oct 19, 2018 3:19 am

ok thank you so much for letting me know! i truly appreciate it!

W. H. Heydt
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Re: will Raspberry Pi 3 fry if i use a 5V/850mA power supply?

Fri Oct 19, 2018 4:15 am

blueagent004 wrote:
Fri Oct 19, 2018 1:40 am
i've read on the official wiki that a 5V/2000mA power supply is recommended for the Raspberry Pi 3 model B+.
Say what? The recommended power for a Pi3B+ is 5v, 2.5A. Whoever wrote 2A is blowing smoke.

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HawaiianPi
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Re: will Raspberry Pi 3 fry if i use a 5V/850mA power supply?

Fri Oct 19, 2018 4:49 am

blueagent004 wrote:
Fri Oct 19, 2018 1:40 am
i've read on the official wiki that a 5V/2000mA power supply is recommended for the Raspberry Pi 3 model B+.
Incorrect. The recommended power supply for both the Pi 3B and newer 3B+ is 5V/2.5A (5V at up to 2500mA).

The official Raspberry Pi Universal Power Supply is the most recommended because it is a proven performer, and it's pretty affordable (of course that depends on where you are, and who you buy it from).
so a month ago i ordered a USB power adapter on ebay which matched this criteria.
An unfortunate waste of money, since that is not the recommended power supply.
today i got the package but apparently the seller sent me an under-powered usb adapter of 5V/850mA

i need to test my brand new raspberry pi3 to see if it's working or not, i waited and waited for that darn new usb power adapter from ebay and now i've been sent the wrong one.

so can i just use the 5V/850mA usb power supply to just do a simple, one-time test to see if my brand new raspberry pi3 is working or not?
Your Pi 3B+ can probably boot on 850mA, but if you experience a failure you won't know if it's the power supply or the Pi3B+ computer.
i've already ordered another 5V/2000mA power supply from another seller on ebay but it won't arrive for another month
Likely more money wasted...
i'm sick and tired of waiting, i'm so, so sick and tired of waiting like this, i feel the urge to just use the 5V/850mA adapter i've received to test my Pi3 but i'm worried that the low power will damage my pi.
Sorry to say, but you should have just gotten the official power supply. While the crappy ebay PSU might not damage your Pi, it also won't run it correctly. Seriously, stop buying crap from ebay, and get a power supply you know will work.

https://www.raspberrypi.org/products/ra ... er-supply/
My mind is like a browser. 27 tabs are open, 9 aren't responding,
lots of pop-ups...and where is that annoying music coming from?

k-pi
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Re: will Raspberry Pi 3 fry if i use a 5V/850mA power supply?

Fri Oct 19, 2018 9:08 am

I have to agree, buy the official power supply, it may cost a little bit more, but it's guaranteed to work flawlessly with your RPi3B. 8-)

jahboater
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Re: will Raspberry Pi 3 fry if i use a 5V/850mA power supply?

Fri Oct 19, 2018 9:33 am

k-pi wrote:
Fri Oct 19, 2018 9:08 am
I have to agree, buy the official power supply, it may cost a little bit more, but it's guaranteed to work flawlessly with your RPi3B. 8-)
+1

When I order mine from PiHut, they usually arrive the next day.
Why wait ages for cheap rubbish from ebay?

Actually I think the official PSU is very cheap, especially considering its high quality and reliability.

PS:
Don't throw your 850ma PSU away, it will probably be OK for a Pi Zero.

drgeoff
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Re: will Raspberry Pi 3 fry if i use a 5V/850mA power supply?

Fri Oct 19, 2018 12:31 pm

If the ebay listing said 2000 mA and the one you received says 850 mA, contact the seller. If that doesn't get you a refund or a proper replacement, open a case with ebay.

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