Please do not post a support request without first reading and following the advice in https://retropie.org.uk/forum/topic/3/read-this-first

Power Supply Help



  • Hi i know i have been asking a lot of questions recently but that is only because i have had my Pi for only like 4-5 days now and right now with my Pi 3 i am using a 5 volt 2 amp power source and need help with this or with something like this.
    And the reason why i am asking is because i read the max amp needed is 2.5 but on the NorthPada one people are saying the 3 amp is better to have and also the main reason for those 2 anyways is to have an on/off button instead of unplugging it every time i power down the system.



  • Using a 3 amp supply is fine, the pi will only draw as much power as it needs. The button on the wire is definitely convenient. I've never heard of northpanda as a brand, sometimes those cheap chinese power supplies can be cheaply made with corners cut in ways that can actually make them susceptible to short circuits, so just be careful in that regard. Sometimes you can find reviews and teardowns for power supplies online. It's best to trust the official Pi Foundation power supply or supported brands like Canakit.



  • @Capeman said in Power Supply Help:

    Using a 3 amp supply is fine, the pi will only draw as much power as it needs. The button on the wire is definitely convenient. I've never heard of northpanda as a brand, sometimes those cheap chinese power supplies can be cheaply made with corners cut in ways that can actually make them susceptible to short circuits, so just be careful in that regard. Sometimes you can find reviews and teardowns for power supplies online. It's best to trust the official Pi Foundation power supply or supported brands like Canakit.

    Thanks for the help and understanding of this because for me i keep getting the low power warning when playing games like Kirby for the SNES which i find a little annoying at times because it just sucks that pops up and it feels like i am playing it on like 5 fps and this is with like nothing else on the screen meaning no enemies no items nothing just the starting point.



  • If you're using anything rated under 2.5 amps, you are going to get the power warning icon. Also, a properly rated but cheaply made power connector will sometimes do the same thing because it will not be able to deliver consistent voltage and/or current. When it comes to most raspberry pi add-ons, cheap is often good, but the power supply is one of those things you can't cut corners on.

    Best part is the official power supply isnt even expensive.
    https://www.pi-supply.com/product/official-raspberry-pi-power-supply-newest-version/

    If you want the power button function just get one of these to go along with it. This is the one Adafruit sells, so you know its been tested for quality.
    https://www.amazon.com/gp/offer-listing/B00KAE3F58/ref=dp_olp_new_mbc?ie=UTF8&condition=new



  • Also, anything connected to the USB ports will draw some power further decreasing the ability to maintain the juice required by the Pi.



  • @Capeman I would suggest that the canakit power supply is probably quite cheaply made inside, I have three of them, and all three of them give a small elecrtic shock if you touch the negative part of the cable output.
    I should do a voltage test to determine if infact they are using non isolated AC rails inside.





  • @spruce_m00se i use two canakits. I like them. I have never zapped myself with them. It might be that you built up static electricity easily in your house. Also could be faulty wiring in your house. If you have an open neutral somewhere in your house you could be getting back feed. Most common is at the panel or if you have a bad gfci.



  • @edmaul69 said in Power Supply Help:

    gfci.

    its very possible that there is a problem in the house somewhere. its a rented apartment, so I wouldnt bother hunting it too much, I have also noticed the issue at work when plugging it in, but again, also possibly a bad ground somewhere etc.



  • @spruce_m00se its actually kind of common in business' with a lot of lighting. Idiots have no clue when they are wiring them up. We used to have fun at a place i worked at. There was a little entrance for employees to go behind the glass counters. If you touched the metal on the counters on both sides of you it would juice you. A neutral wire was grounded out on one of the cabinets lighting system. Before i worked there they paid me to find and fix the electrical problem. Then when they moved, i wired the whole stores electrical to make sure it was done right.



  • @edmaul69 yeh , well I live in Dubai, and the workforce here that do that kind of thing cannot be commented on. so it could well be what you say.



  • I was reading into brands this morning, apparently the northpada charger you listed is very well made and tested to be a good quality power supply. The cord is short at only 1m, but 3a output is worth it. I'd say that is a good option also.



  • @Capeman said in Power Supply Help:

    I was reading into brands this morning, apparently the northpada charger you listed is very well made and tested to be a good quality power supply. The cord is short at only 1m, but 3a output is worth it. I'd say that is a good option also.

    Right now the connection from my Pi to the plug anyways is only like .5m because i have an extension leading onto my desk because of my home phone.



  • Hey guys i ended up getting the Enokay Power Supply 2.5A which is working perfectly right now no power issues at all and just wanted to ask if i get something like this will i have any kind of power issues at all for extending it further or no?



  • You linked to an HDMI mini to full size adapter. Not sure if that's what you meant to do.



  • @Capeman said in Power Supply Help:

    You linked to an HDMI mini to full size adapter. Not sure if that's what you meant to do.

    Look at the link again because it shows this alt text



  • @Ecks It might have power issues if the power wires are thin, but one reviewer there doesn't seem to have an issue. In my super famicom mod, I made my own microusb extender with pc psu wires, but my wiring is much longer. Price doesn't seem reasonable. Try ebay and buy from a chinese seller that lists the AWG size. The lower the number the thicker the wires.



  • @Darksavior said in Power Supply Help:

    @Ecks It might have power issues if the power wires are thin, but one reviewer there doesn't seem to have an issue. In my super famicom mod, I made my own microusb extender with pc psu wires, but my wiring is much longer. Price doesn't seem reasonable. Try ebay and buy from a chinese seller that lists the AWG size. The lower the number the thicker the wires.

    Thanks and the reason why i asked about this as well is because i am thinking of installing my Pi inside of my arcade joystick when i make it which i already have a small extension for HDMI and USB just so i could plug in another controller in the future and also just curious if this could be good to use as well alt text because everything is going to be closed up inside anyways so just would like to have an option of accessing the SD card port still.



  • cable extensions wont draw any additional power


Log in to reply
 

Contributions to the project are always appreciated, so if you would like to support us with a donation you can do so here.

Hosting provided by Mythic-Beasts. See the Hosting Information page for more information.