hmnit wrote: ↑Sat Jul 20, 2019 10:58 pmHi I just bought the raspberry pi 4 but it says that I have to use a 5v 3a charger. I only have 5v 2.4a power bank(my phone charger is 5v 2a). Can I use this 5v 2.4a? I'm just worried that it might break the raspberry pi or is it just fine? If it has any negative effects on the pi I will get a new charger. Thank you so much for your help.
ps. I also live in a 220v country does this difference matter?(from a 110v country)
Can you provide a reference to this advice? Presumably it is not documentation issued by Raspberry Pi themselves.it says that I have to use a 5v 3a charger.
Oh boy here we go again.... bring out the popcorns and drinks!
I doubt it says "charger" anywhere in the official documentation, because Raspberry Pi computers do not have batteries or anything else that needs to be charged. What you want is a 5V/3A POWER SUPPLY.
Sorry, it does say power supply on the documentation. I did not know charger and power supply were totally different. It was my lack of understanding. Thank you though for explaining thoroughly to someone who is new to Raspberry pi.HawaiianPi wrote: ↑Mon Jul 22, 2019 3:29 amI doubt it says "charger" anywhere in the official documentation, because Raspberry Pi computers do not have batteries or anything else that needs to be charged. What you want is a 5V/3A POWER SUPPLY.
A charger may work, but may have poor voltage regulation and not work reliably under heavy loads. Typically this won't harm the Raspberry Pi, but it may corrupt data on the SD card, and in rare cases it may cause the SD card to fail (read-only).
Every time a new, more powerful Raspberry Pi computer is released we go through this. Someone always wants to use a phone charger instead of purchasing the (very affordable) official power supply. It's up to you if you want to do this. It may work fine, and in the event it doesn't, it probably won't do any harm (other than data corruption). Just be aware of the slim possibility of your SD card going read-only and requiring replacement.
If your charger is a higher powered unit for a laptop, then it likely won't work at all, since the Pi4 misidentifies itself to e-marked/PD type chargers (which are typically laptop chargers). If it has a removable USB cable you might be able to get it working with a non e-marked/PD cable between the charger and the Pi4 (again, this is entirely up to you, and at your own risk).
If the "charger" will maintain a minimum of 4V75 at the Pi while supplying 3A, it will be fine. As above, that is a "worst case" requirement and you may not actually need 3A anyway. The cable (24AWG) is a bit thin, the official PSU uses 18AWG (thicker) for a good reason. (The clue is "supports 2A+". The design goal is 3A unless you know the current requirement of your particular setup.)
A power supply (PSU) is basically a charger with hair on it's chest. The major difference is that a PSU specifies that the output current can be supplied *and* maintain the specified voltage. A charger may or may not do that. This is because a battery being charged isn't very fussy about input voltage, so long as it is enough above the battery voltage to charge said battery. A Pi, really, really "wants" full voltage (at least 4.75v) *and* whatever current, up to its maximum rating, at the same time. So what it comes down to is that a PSU has much more robust voltage regulation, especially when subject to maximum rated load.
USB-C cables have multiple power wires, so 24 AWG might be enough, depending on how many internal power wires the cable in question actually has (3x24 AWG should be fine, but if it only has 1...).