How to Power a Raspberry Pi: Pro Tips for Every Use
Finding a power supply compatible with your Raspberry Pi can be a mess, as each model has specific requirements in terms of power and connectors. But don’t worry, I’ve gathered all the information for you and will explain everything in this article.
A Raspberry Pi must be powered with a compatible power supply. All models run on 5.1 volts, but the Pi 5 needs 5A, the Pi 4 and Pi 400 require 3A, while other models work fine on 2.5A. It’s not recommended to use a standard phone charger or USB cable to power a Raspberry Pi.
In this article, I’ll show you what can be used to power the Raspberry Pi and what you should pay attention to when getting a power supply.
If you’re feeling lost in all the Raspberry Pi jargon, I’ve got something to help you out. I’ve created a free glossary that explains all the essential terms and abbreviations in a way that’s easy to understand. It’s a great resource to have by your side. Get your free copy here.
How Do You Power a Raspberry Pi?
In this section, we’ll cover what voltage and amperage requirements you’ll need for different Pi models and what kind of power supplies to get for each one.
What Are the Power Requirements for Raspberry Pi?
As a general rule, Raspberry Pi models can be powered with a 5.1V power supply. Although their voltage requirements are the same, recent models require more current output. The Pi 5 needs 5.0A, while the Pi 4B and Pi 400 need 3.0A to work efficiently.
Here’s a table with all the information you’ll need to choose a power supply:
Check this: Pi5 vs. Pi4: I tested them, here's the result
| Model | Voltage | Recommended Capacity |
| Pi Zero / Zero W | 5.1V | 1.2A |
| Pi Zero 2 W | 5.1V | 2A |
| Pi 1 A / A+ | 5.1V | 700mA |
| Pi 1 B+ / 2 B | 5.1V | 1.8A |
| Pi 3 A+ / B / B+ | 5.1V | 2.5A |
| Pi 4 / 400 | 5.1V | 3.0A |
| Pi 5 / 500 / 500+ | 5.1V | 5.0A |
| Pi Pico | 1.8–5.5V DC | – |
Using an Official Power Supply
You’ll also have to keep in mind that some models use different connectors, so make sure to get a power supply that will fit your Pi.
The newer Raspberry Pi 5, Pi 4B, and Pi 400 use USB-C power connectors, while older models use a micro USB power connector.
| Model | Power Connector | Power Supply |
| Pi Zero / 1 / 2 / 3 | Micro USB | CanaKit PSU Link |
| Pi 4 B / 400 | USB-C | Official PSU Link |
| Pi 5 | USB-C | CanaKit PSU 5A Link |
| Pi Pico | Micro USB |
The easiest way to avoid any issue with your power supply is to grab the official one for your specific model. This way you’ll be sure it respects the requirements and that it’ll work like a charm with your Pi. The table above provides links to power supplies proven to work with your Pi.
Bonus tip: When I started, the hardest part wasn’t the setup, it was figuring out what to build next. I ended up creating a list of 75+ project ideas with links and difficulty, so it’s easier to just pick something and try it. Grab the list here.
If you want a clearer path than jumping from tutorial to tutorial, my book gives you a step-by-step roadmap to really understand your Raspberry Pi.
Check the book hereYou can get answers from real experts in minutes.
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Power Issues: Lightning Bolt Icon
If a lightning bolt icon appears at the top right of the screen on Raspberry Pi OS, it means that your power supply is not providing enough power to the Raspberry Pi.
You should purchase a PSU that meets the requirements listed in the above table as underpowering your Pi could cause damage to the micro-SD card or the board itself.
Power Considerations for Peripheral Devices
Adding peripheral devices may increase the power requirements for your Raspberry Pi, but there are a few tips that can help avoid the most common issues.
If you use a wireless keyboard and mouse, the dongle to control these devices can be plugged directly to the Raspberry Pi’s USB ports. If you go this route, try to purchase a keyboard and mouse that share the same dongle; otherwise, you’ll need to use 2 USB ports, which eat up more power.
Personally, I use this one from Riitek, which only takes one adapter.
USB flash drives used as additional storage or boot media can also be connected directly to the Raspberry Pi’s USB ports. Their low power requirements shouldn’t cause any issues.
However, what if you want to add larger storage options, such as a solid-state drive (SSDs are great for making your Raspberry Pi run faster) or hard-disk drive (HDD)? For these situations, I recommend using a powered USB hub instead of attaching it directly to the Raspberry Pi.
These devices drain much more power and may lead to “under-voltage detected” errors. Using a powered USB hub will ensure that they draw power from your main outlet instead. It’s not an expensive upgrade at all—you can find some great options on Amazon (like this one).
Using a Regular USB Cable to Power a Raspberry Pi
It’s possible to power a Raspberry Pi by plugging a regular USB cable into a port on your computer. This isn’t the best way, however, as the computer won’t deliver enough current to power all of your accessories.
However, it’s a convenient way to get started it if you have nothing else available. You’ll probably run into the lightning icon error if you ask too much of your Pi.
To power your Pi with your PC, you’ll need a USB cable that has a standard USB connector on one end to connect to your computer. On the other end, the cable needs to be either a Micro USB connector or a USB-C connector, depending on the Pi model you’re using.
Check the table above for the right connector for each model. For example, you’ll need this kind of USB cable for a Raspberry Pi 5, 4, or 400.
Using a Phone Charger to Power a Raspberry Pi
Bonus tip: When I started, the hardest part wasn’t the setup, it was figuring out what to build next. I ended up creating a list of 75+ project ideas with links and difficulty, so it’s easier to just pick something and try it. Grab the list here.
It is NOT recommended to use a phone charger to power the Raspberry Pi. In general, these chargers don’t produce the exact voltage and amperage written on the label.
Also, the newer Pi 5 and Pi 4 models require higher amperage than most phone chargers can provide.
Therefore, it’s recommended to purchase a power supply unit (PSU) that’s designed specifically for the Raspberry Pi. You can purchase them from an official reseller, just like where you purchased your Pi.
Powering the Raspberry Pi With a Solar Panel
If you’re looking for a neat outdoor project, check out this option I’m planning to use for my solar-powered weather station. After reading several articles, I’ve selected the following hardware for my station:
- 12-Watt Solar Panel is how you’ll collect energy from the sun.
- Portable power platform which attaches to the Raspberry Pi. It’s the brain that will control battery charging and will shutdown the Pi if the battery drops too low.
- 3.7V 5000mAh battery to store the charge from the solar panels.
- BME280 sensor that measures humidity, pressure, and temperature and which measures only 1” x 1.5” in size.
- Raspberry Pi Zero 2W: The 2W comes with Wi-Fi/Bluetooth and a 40-pin header attached.
The BME280 and devices for measuring wind speed and rainfall amount will be attached to the Raspberry Pi Zero. The Zero will then transmit the data via Wi-Fi to a Raspberry Pi 4 running PostgreSQL database for data storage and report generation.
You can find more details about this project in this video if you are interested:
Want even more ideas? I put together a free resource with over 75 Raspberry Pi project ideas, each with a quick description, tutorial link, and hardware requirements. Whether you’re just starting out or looking for something to do this weekend, this list will keep you busy for a while. Just click here to get instant access.
By the way, you can also use a device like the RasPad 3 which includes a battery inside the case. It will work for a few hours, so it might be enough in many cases. You can find my review of the RasPad 3 here with more details about this.
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What if Your Raspberry Pi Still Won’t Boot?
If you followed all the recommendations listed above and your Raspberry Pi still doesn’t boot, it’s probably an issue unrelated to the power supply. Many reasons can cause a Pi to not boot correctly.
In fact, I have an entire article about it that you can find here. Please don’t hesitate to read it if you experience any issues with your Pi.
Not getting the same result?
Even when you follow every step, small differences in OS version, hardware or config can change the outcome. Instead of wasting time guessing, get help from people who have already fixed the same kind of issue.
- Get help on your exact issue
- Access step-by-step videos for tricky setups
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People forget (or don’t know) that even if your Power Supply shows 5.1V it does not mean you will get it on Raspberry – problem being: cable (thickness, length) as well as cheap (low quality) connectors. Also switches on the cables. When your Pi is asking for 2-3A, you might lose 0.5V on these cables/connectors and in fact you will get only 4.5V on Pi.
So either better cabling or higher voltage. Pi can easily work with 5.6V: when idle, RPi 4 takes around 0.8A with SSD connected to USB3 directly – when under full stress (i.e. CPU 100% – all cores and full write to SDD) it will very fast get into 2.2A. And I am talking headless (no display) Pi 4B.
The low voltage warning starts around 4.8V on 5V GPIO pins but the critical point is connected SSD – usually disk is becoming read-only or looses the connectivity. With microSD Pi works even at around 4.4V. I spent some time testing these issues while building big power supply with UPS to my 5 pieces of Pi I have in my home.
Pi Zero W is much less hungry – of course Pico is not even computer so this one is usually never hungry 😉