Raspberry Pi 5 Power Supply Alternative: 9 Specs, 19 Threads
I do not own a Raspberry Pi 5. The machine that runs this blog is a Mac mini, and I have said so in every Pi 5 post here. But the Pi 5 series on this site keeps landing on the same part: in my NVMe not detected census three of 77 threads ended on the power supply, the PoE HAT post spent a paragraph on the 600 mA USB cap, and Google autocompletes “raspberry pi 5 power supply alternative” eleven times off the seed “raspberry pi 5 power supply”. So this is a desk job, not a bench job. I normalised the published specs of nine supplies sold for the Pi 5, opened every listing on the first page of an Amazon search, and read 19 forum threads about the warning that appears when the Pi decides your supply is not good enough. The short version is that the alternative you want has to advertise a 5 V 5 A profile, almost no ordinary charger does, and most of the threads were not about third-party supplies at all.
What the Pi 5 actually asks for
The numbers come from the official power supply page in the documentation repo, which I read as the AsciiDoc source. The recommended supply current for a Pi 5 is 5.0 A. The board itself draws about 800 mA at idle. The part that bites is the USB budget: with a supply that negotiates 5 A, the four Type-A ports may draw 1.6 A in total; with any other supply, 600 mA. The fan header draws from the same USB rail, which is why switching the ports off also stops the Active Cooler. The 2023-09-28 launch post spelled out the reason: “When using a standard 5V, 3A (15W) USB-C power adapter with Raspberry Pi 5, by default we must limit downstream USB current to 600mA to ensure that we have sufficient margin.” That launch post also named the price of the fix, a $12 adapter “which supports a 5V, 5A (25W) operating mode.” The same page notes that no Raspberry Pi supports USB PPS, and that on a multi-port PD charger, plugging a second device in forces a renegotiation that can boot a Pi that was powered down.
How the Pi decides is USB Power Delivery. The supply advertises a list of fixed voltage and current pairs, the Pi asks for the 5 V one, and if that entry says 5 A the firmware lifts the USB limit. A Raspberry Pi engineer posting as dp11 quoted the relevant footnote from USB PD R3.1 v1.8 Table 10-2 in an October 2023 thread: “The Fixed PDOs Maximum Current field Shall advertise at least 3A, but May advertise up to RoundUp (PDP/Voltage) to the nearest 10mA. Requires a 5A cable if over 3A is advertised.” So a 5 V 5 A entry is legal, optional, and needs an e-marked 5 A cable, which is why every supply below ships with its own lead. If you are using your own cable, my USB-C cable speed post covers how to read the marking.
Nine supplies sold for the Pi 5, one table
These are manufacturer spec sheets, not measurements. I pulled each from the vendor’s own page or product brief on 2026-09-11; the price column is the vendor’s list price on that date, not Amazon’s.
| Supply | 5 V profile | Other PD profiles | Cable | Vendor price |
|---|---|---|---|---|
| Raspberry Pi 27 W | 5.1 V 5 A | 9 V 3 A, 12 V 2.25 A, 15 V 1.8 A | 1.2 m, 17 AWG | $12 |
| Raspberry Pi 45 W | 5.1 V 5 A | 9 V 5 A, 12 V 3.75 A, 15 V 3 A, 20 V 2.25 A | 1.5 m, 17 AWG | $15 |
| Argon PWR GaN 27 W | 5.1 V 5 A | 9 V 3 A, 12 V 2.25 A, 15 V 1.8 A | 1.5 m | $12.50 |
| CanaKit 5 A PD, 45 W | 5 V 5 A | “up to 45W”, profiles not listed | 5 ft | $14.95 |
| Geekworm GaN PD 27 W | 5.1 V 5 A | not listed | not listed | $12.50 |
| 52Pi 5 V 5 A Type-C | 5 V 5 A | not listed | not listed | $10.39 |
| Vilros 27 W | 5.1 V 5 A | not listed | 5 ft | $14.49 |
| Waveshare PSU-27W-USB-C | 5.1 V 5 A | 9 V 3 A, 12 V 2.25 A, 15 V 1.8 A | not listed | not listed |
| Radxa Power PD 30 W | 5 V 5 A | 9 V 2 A, 12 V 2.5 A in the text, 12 V 2 A in the spec line | USB-C plus a DC barrel lead | not listed |
Three things fall out of the table. First, four of the nine publish the exact same profile list as the official 27 W brick, which suggests the same reference design. Second, four vendors list only the 5 A headline and nothing else, so you are trusting the title. Third, Radxa’s own product brief disagrees with itself on the 12 V line, which is the kind of thing a spec-sheet comparison exists to catch. The 45 W brick, published April 2025, is the only one that keeps 5 A available at 9 V as well; that matters for nothing on a Pi 5, which only ever asks for the 5 V entry, but it does make it a usable laptop charger.
The bottom three rows are the point. Apple’s 20 W adapter guide lists “5VDC/3A or 9VDC/2.22A”. Anker’s Nano 3 30 W spec reads “5.0V=3.0A 15W/9.0V=3.0A 27W/15.0V=2.0A 30W/20.0V=1.5A 30W”. A 30 W charger and a 240 W one both hand the Pi 3 A at 5 V, because the wattage lives on the higher voltages the Pi never requests. In the threads below, an Anker Prime 240 W power bank, a MacBook 140 W adapter and a OnePlus 65 W charger all lost to a $12 brick for exactly this reason.
What the Amazon search page looks like
I searched Amazon for “Raspberry Pi 27W USB-C Power Supply” on 2026-09-11 and opened the first page from a mobile session. It surfaced 14 listings; I could read 13. Ten of the 13 put “5.1V/5A” or “5V 5A” in the title, and the three that did not were GeeekPi, iUniker and CanaKit. The brands were RasTech twice, GeeekPi, iUniker, SANOOV, InnoMaker, IJP, iRasptek, one with no brand in the title at all, Argon, CanaKit, a reseller relisting the official brick under its own name, and one listing that is the official Raspberry Pi 27 W in white. That last one was priced at double the $12 list price on the day I looked, which is the most useful thing on the page: the official supply is cheaper from a Pi reseller than from Amazon. I have not powered a Pi from any of these and I did not find a forum post from anyone who had measured the third-party ones either; the one thread that asked, page 4 of the Pi 5 USB-C PD thread, lists six brands and gets no test results back.
Nineteen threads about the 5 A warning
The message that sends people looking for an alternative reads “This power supply is not capable of supplying 5A. Power to peripherals will be restricted.” I collected 16 threads from the Raspberry Pi forum and three from Pimoroni’s forum, October 2023 to August 2025, by searching for that string and for Pi 5 power supply questions, then reading each one. Reddit is not reachable from this machine, so it is not in the count. I sorted them by what the thread actually turned out to be about.
| What it was | Threads | Example |
|---|---|---|
| A PD charger with no 5 A entry, so the Pi fell back to 3 A | 6 | Anker Prime 240 W power bank crashing under LLM inference; “the Anker Prime does not list 5V/5A” (2024-12-16) |
| No PD at all: battery, bench supply, a HAT feeding the header | 5 | A Build HAT powering the Pi through GPIO, warning cannot be negotiated away (2025-01-07) |
| Official 27 W brick, warning anyway | 4 | Plug not fully seated; USB 3 extension cables; an Argon One V3 case until its firmware was updated (2024-11-30) |
| Is 5 V 5 A even allowed by the spec | 2 | The dp11 footnote quote above |
| Official brick, undervoltage under a real load | 2 | Two Kingston KC3000 drives on an NVMe Base Duo, “Undervoltage detected!”, fixed by soldering 5 V straight to the board (2024-05-04) |
So six of 19 were the case the question assumes, a good charger that is not a 5 A charger. Four were false alarms with the right brick. Five were setups that can never pass PD negotiation because there is no PD in the chain, and for those the answer is not a different supply. On the 2024-01-18 thread one poster had the official supply and the warning, and the reply that solved it was about the USB 3 extension cables in between, not the brick. In the 30 W adapter thread bjtheone gave the cleanest summary of the fallback: “A USB-PD supply without the 5v@5A mode, will end up supplying 5v@3A, which will work under light load conditions.” And in the 2025-01-26 thread a regular wrote that “The Official Pi 5 PSU is the only one in the whole wide world which provides 5V at 5A on request from the Pi,” which the table above shows is false on paper, and which nobody in the thread could refute with a measurement.
The two overrides, and what they cost you
If your power comes from something that cannot negotiate, a battery pack, a bench supply, a PoE HAT feeding the header, there are two documented ways to tell the firmware to stop asking. Both come up in the five no-PD threads.
# /boot/firmware/config.txt, lifts the USB limit to 1.6 A without negotiation
usb_max_current_enable=1
# EEPROM, skips PD negotiation entirely and assumes the rating you give
sudo rpi-eeprom-config --edit
PSU_MAX_CURRENT=5000
# check what the firmware decided
vcgencmd get_config usb_max_current_enable
vcgencmd get_throttledThe bootloader documentation says the EEPROM property “instructs the firmware to skip USB power-delivery negotiation and assume that it is connected to a power supply with the given current rating,” typically 3000 or 5000. In the first powering thread from October 2023, the moderator jamesh described it as “telling the firmware that this is bench power supply and that it should not attempt USB-PD,” and pointed people with a 3 A brick to the config.txt line instead. The cost is obvious: you have removed the only check between a 3 A charger and a 5 A load. A throttled value of 0x50000 on the DC-DC thread is what that looks like afterwards. If you are pushing an SSD off the USB ports, a powered hub moves the load off the Pi’s budget entirely, which is the fix that does not depend on the supply at all.
One firmware detail from the rpi-eeprom release notes is worth knowing if you still have a launch-week board: the 2023-09-21 bootloader fixed a “bug where button press was not monitor for USB-C power supplies that were detected as < 3A.” Power button dead on a weak charger was a firmware bug, not a hardware one.
What I would order
Given that no one has published a measurement of the third-party bricks, the ranking is by what is on paper and who stands behind it. The official 27 W supply has the profile list, a 17 AWG lead, a production commitment through January 2035 in its brief, and a $12 list price; buy it from a Pi reseller rather than the Amazon listing, which was double that when I checked. If you also want a charger for a laptop, the official 45 W keeps 5 A at 9 V and lists at $15. If the official one is out of stock where you are, Argon’s PWR GaN 27 W publishes the identical four profiles and a longer 1.5 m lead, and CanaKit’s 45 W PD brick comes with a 5 ft cable and, on one listing, an inline switch the Pi 5 does not need since it has a power button. What I would not do is buy a 100 W GaN charger and hope: the Pi will take the 3 A entry, cap USB at 600 mA, and the NVMe HAT you bolt on next will be the thing that stops working.
FAQ
Can I use a Raspberry Pi 4 power supply on a Raspberry Pi 5?
Yes, and the Pi will boot. The Pi 4 brick is rated 5.1 V 3 A, so the Pi 5 shows the 5 A warning and limits the USB ports to 600 mA total. That is enough for a keyboard and mouse and usually not enough for a bus-powered SSD. The documentation lists 5.0 A as the recommended supply current for the Pi 5.
How do I get rid of the “not capable of supplying 5A” message?
First check the chain: the plug fully seated, no USB extension between brick and board, no case that sits in the power path with old firmware. Four of the 19 threads I read had the official 27 W supply and one of those problems. If the supply genuinely has no 5 V 5 A profile, replace it with one that does. If there is no PD in the chain at all, set usb_max_current_enable=1 in config.txt or PSU_MAX_CURRENT=5000 in the EEPROM, knowing you have disabled the check.
Is the 45 W supply worth it over the 27 W one for a Pi 5?
Not for the Pi alone. The Pi 5 only requests the 5 V profile, and both bricks advertise 5.1 V 5 A there. The 45 W brick adds 9 V 5 A, 12 V 3.75 A, 15 V 3 A and 20 V 2.25 A, which makes it a real laptop and phone charger for $3 more on list price. Raspberry Pi’s own brief pitches it at people running an NVMe drive and an AI HAT+ at once, but on a Pi 5 the extra current still arrives through the same 5 V 5 A ceiling.
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How this was put together: the spec table comes from each vendor’s product page or product brief PDF read on 2026-09-11 (Raspberry Pi 27 W brief dated October 2023, 45 W brief April 2025, Argon, CanaKit, Geekworm, 52Pi and Vilros product pages, Waveshare’s product page, Radxa’s Revision 1.1 brief). The Amazon page is one search on 2026-09-11 from a mobile session; 14 listings surfaced and 13 opened. The 19 threads are 16 from forums.raspberrypi.com and three from forums.pimoroni.com, found through search results for the warning text and Pi 5 power questions, each read in full and sorted by what the thread turned out to be about; Reddit was not reachable from this machine and is not counted. Quotes were copied from the threads with the poster’s username and date. I do not own a Pi 5 and measured nothing here; every product claim in this post is a manufacturer figure or another owner’s report, and is labelled as such.