jason_kidd wrote: ↑

Tue Aug 20, 2024 10:57 am

RPI actually recognises it as "PD compliant". It states in the bios that it is 15 watt PD. In my particular case i think the power brick can not maintain a steady 5 volts even in 3 amps so yeah, it is a rather bad product. Or maybe it is a bad cable.

However, what i realized is that the 5 volt PD spec with larger than 15 watts is quite rare (not supported by most third party power bricks). Manufacturers rather prefer to up the voltage instead. I think this discussion has been made in the forum before. Despite the fact that PD standard has this option among its spec sheet, it also has to be supported by the manufacturers of the power supplies.

In any case, maybe for the next Raspberry Pi, a "more widely supported" PD spec can be selected and the buyers would be happier about that. Or even better, a wider range of PD specs with varying voltages. I mean if PD is the way to go for RPI, it can definitely be better utilized.

And please do not tell me to buy the official power supply because it is "very cheap". We have been over this before.

Sometimes the adapter is able to give 3A @ 5V, but most cables drop voltage when higher currents are drawn. So there is always under-voltage warning. Few adapters went to 4.4V when I checked. Most of these adapters are not designed to go to the 3A in 5V. When higher power is needed, they usually increase the voltage, as you have mentioned. But even if they could supply 3A at 5V, the voltage drops on the cable will cause problems. Since most of these are adapters for phones, even if the voltage falls to 4.6V, they might not have much problem.

Most cables do not limit the impendence as the voltage usually increases for higher wattage adapters. So, a little drop in voltage is not an issue for most cable manufacturers. But it becomes very significant at the lowest voltage of 5V. I tried a board from Tindie which said it will convert the USB-PD to 5V 5A. The voltage is about 5.3V on the board and it drops to 5.15V just when RPi 5 runs on USB boot over the USB-C cable. The USB-C cable drops 0.15-0.2V just over that small current. It cable is pretty short though. It works pretty well with Pi5 8GB in USB Boot. I tried using a load resistor on the cable end. When the board was giving 5.3V, the USB-C cable dropped the voltage to about 4.95-4.98V in 3A continuous current draw. This is for a 20cm long cable. If the adapter is giving about 5.0V, the same cable will drop the voltage to 4.65V at 3V, which will give under-voltage warnings. Cable becomes very significant when current is high and voltage is low.

For this board, they asked to disable power negotiation and use PSU_MAX_CURRENT=5000 and usb_max_current_enable=1. The USB boot wasn't working until I changed this. There was a weak power source or similar warning before I changed this setting

jason_kidd wrote: ↑

Tue Aug 20, 2024 10:57 am

And please do not tell me to buy the official power supply because it is "very cheap". We have been over this before.

Liz Upton reported running a MacBook from the official Pi5 PSU. Cost comparison between the Pi5 PSU--12GBP--and the Apple PSU--90GBP--would indicate that, all things considered, the RPT Pi5 PSU is, indeed, very inexpensive. So....do you want to spend a bit more now, or spend it later after a great deal of frustration, aggravation, and swearing? It's your call...

W. H. Heydt wrote: ↑

Wed Aug 21, 2024 7:01 pm

jason_kidd wrote: ↑

Tue Aug 20, 2024 10:57 am

And please do not tell me to buy the official power supply because it is "very cheap". We have been over this before.

Liz Upton reported running a MacBook from the official Pi5 PSU. Cost comparison between the Pi5 PSU--12GBP--and the Apple PSU--90GBP--would indicate that, all things considered, the RPT Pi5 PSU is, indeed, very inexpensive. So....do you want to spend a bit more now, or spend it later after a great deal of frustration, aggravation, and swearing? It's your call...

The official Pi5 PSU maybe cheap, it needs mains voltage on the input side. Also the stack of electronic waste doesn't get smaller. I once asked here on the forum if it could also work from a DC voltage like 48V (or 12V actually from my car). Generic, no mains adaptor can, as it is all world-wide, AC so labeled 100-240, in some countries it probably has to deal with up to 264, I have seen 253 on sunny days.
As there is some sort of rectifier in the input stage, I was wondering if this PSU was maybe so special (like the odd 5A for 5V) that it also would deal with a constant low DC voltage at the input, like typically 48V you get from residential batteries for solar power storage. Sine-wave zero-crossing is 0V so you never know. I have run various machines on 4x11.1V LiPo's ('48v'). I could cut some metal with a grinder (for 230V AC), slow rotating though.
Anyhow I bought some coin-sized USB-C PSU modules that implement USB-C PD, those can use something typically 9-36V, low-voltage, no risks for electrocution. I also replaced the barrel-jack of special HP laptop PSUs with it, they are 19V or so.

redvli wrote: ↑

Thu Aug 22, 2024 7:16 am

The official Pi5 PSU maybe cheap, it needs mains voltage on the input side. Also the stack of electronic waste doesn't get smaller. I once asked here on the forum if it could also work from a DC voltage like 48V (or 12V actually from my car). Generic, no mains adaptor can, as it is all world-wide, AC so labeled 100-240,

I used to have an electric shaver that would charge from 100-250V AC or 12V DC. Somehow the built in charger/PSU could handle both ranges.

Unreadable squiggle

I do find it odd that we make a very cheap, very high quality, fully compliant power supply which is 11ドル.60 incl. VAT in the UK (Pimoroni, now), and people still buy other power supplies to save at most a pound or two. Less than the cost of a coffee.

I can sort of see that people who already have a PD supply might be slightly miffed, but its still only 11ドル.60, and saves a lot of grief. And it seems likely that if they have another PD supply, they are going to want to use it for its original purpose at some point, meaning the Pi cannot be used.

Software guy, working in the applications team.

redvli wrote: ↑

Thu Aug 22, 2024 7:16 am

Anyhow I bought some coin-sized USB-C PSU modules that implement USB-C PD, those can use something typically 9-36V, low-voltage, no risks for electrocution.

I'd like a coin-sized DC to DC power module that negotiates 5V at 5A with USB-C power delivery.

Can you make a specific recommendation?

ejolson wrote: ↑

Thu Aug 22, 2024 8:23 am

redvli wrote: ↑

Thu Aug 22, 2024 7:16 am

Anyhow I bought some coin-sized USB-C PSU modules that implement USB-C PD, those can use something typically 9-36V, low-voltage, no risks for electrocution.

I'd like a coin-sized DC to DC power module that negotiates 5V at 5A with USB-C power delivery.

Can you make a specific recommendation?

It is not 5A, just the default 3A as most USB-C PSU's do. It is this one: https://www.aliexpress.com/item/1005006482642562.html
I don't know how good they are, so far no problems. Always check yourself for your application.
The 5A I consider just not an option. I won't use some embedded solution if it might needs more than the old/first PoE (12.5W) power. My Pi4-2GB works diskless netboot/netroot and it stays below that limit without power warnings, also with maxload tests that never happen for my use cases.

redvli wrote: ↑

Thu Aug 22, 2024 8:47 am

It is not 5A, just the default 3A as most USB-C PSU's do. It is this one: https://www.aliexpress.com/item/1005006482642562.html
I don't know how good they are, so far no problems. Always check yourself for your application.
The 5A I consider just not an option. I won't use some embedded solution if it might needs more than the old/first PoE (12.5W) power. My Pi4-2GB works diskless netboot/netroot and it stays below that limit without power warnings, also with maxload tests that never happen for my use cases.

So, since it's only 3A, PD is irrelevant for feeding a Pi -- it will default to 3A anyway.
PD is only needed for a Pi5 with USB (or other) peripherals and a workload that take the total consumption above 3A, or the downstream USB consumption above 600mA. Even then, without PD manual configuration is possible.

Location: 345th cell on the right of the 210th row of L2 cache

jamesh wrote: ↑

Thu Aug 22, 2024 8:14 am

I do find it odd that we make a very cheap, very high quality, fully compliant power supply which is 11ドル.60 incl. VAT in the UK (Pimoroni, now), and people still buy other power supplies to save at most a pound or two. Less than the cost of a coffee.

I can sort of see that people who already have a PD supply might be slightly miffed, but its still only 11ドル.60, and saves a lot of grief. And it seems likely that if they have another PD supply, they are going to want to use it for its original purpose at some point, meaning the Pi cannot be used.

I find it odd that you didn't let the Pi 5 negotiate a higher voltage and lower current, as provided by so many other off-the-shelf power supplies.

The argument that it would make the Pi 5 more expensive is negated by the fact that you have to buy the custom PSU anyway.

Oh no, not again.

ame wrote: ↑

Thu Aug 22, 2024 11:22 am

I find it odd that you didn't let the Pi 5 negotiate a higher voltage and lower current, as provided by so many other off-the-shelf power supplies.

The argument that it would make the Pi 5 more expensive is negated by the fact that you have to buy the custom PSU anyway.

But that's just the point: you really, really don't need the extra power in an awful lot of cases. I run both of mine quite happily from Pi 4 PSUs -- the 4s have long-since been PoE-powered; I'm waiting for the fabled 5-compatible HAT -- and they work perfectly with a mouse and keyboard. Yes, if you really *must* have USB-attached storage or the like you will need more, but if you don't, you're probably fine.

Anyway: where would you put the circuitry? There's no room on the board.

As it is apparently board policy to disallow any criticism of anything, as it appears to criticise something is to criticise all the users of that something, I will no longer be commenting in threads which are not directly relevant to my uses of the Pi.

davidcoton wrote: ↑

Thu Aug 22, 2024 9:44 am

redvli wrote: ↑

Thu Aug 22, 2024 8:47 am

It is not 5A, just the default 3A as most USB-C PSU's do. It is this one: https://www.aliexpress.com/item/1005006482642562.html
I don't know how good they are, so far no problems. Always check yourself for your application.
The 5A I consider just not an option. I won't use some embedded solution if it might needs more than the old/first PoE (12.5W) power. My Pi4-2GB works diskless netboot/netroot and it stays below that limit without power warnings, also with maxload tests that never happen for my use cases.

So, since it's only 3A, PD is irrelevant for feeding a Pi -- it will default to 3A anyway.
PD is only needed for a Pi5 with USB (or other) peripherals and a workload that take the total consumption above 3A, or the downstream USB consumption above 600mA. Even then, without PD manual configuration is possible.

A reason for getting some USB-C powerstuff was that the USB-C connector of a PSU for a HP 2-in-one tablet did not fit tight all the time anymore, so empty battery after days or so. The connector still fits tight in other devices like a Pi4-2GB. I also had no charger for in the car 12V. And I wanted a powermeasure device that can do sub-1Watt, so not on main lines, but on 12V or 5V. On 12V I made myself, logs in databases. But for multi-voltage USB-PD way too complex, not worth DIY. Note that USB-C 'sticks out', so for real 24/7 headless Pis I use GPIO pins. I know the extra config.txt settings w.r.t. Pi5, but not applicable for me.

jamesh wrote: ↑

Thu Aug 22, 2024 8:14 am

I do find it odd that we make a very cheap, very high quality, fully compliant power supply which is 11ドル.60 incl. VAT in the UK (Pimoroni, now), and people still buy other power supplies to save at most a pound or two. Less than the cost of a coffee.

I can sort of see that people who already have a PD supply might be slightly miffed, but its still only 11ドル.60, and saves a lot of grief. And it seems likely that if they have another PD supply, they are going to want to use it for its original purpose at some point, meaning the Pi cannot be used.

The official power supply is sold for 14.62 GPB here (official reseller). I paid 4.50 GPB for the one i bought (including the cable). For 10 pounds, i can buy 1 KG of ground coffee, which would last me around 3 months or so. I confess though, it would not be very good coffee :) But still doesn't make it right paying 2 pounds for just one glass of sugar filled caffeinated thing?? from Starbucks. I think that is worse than my half assed PD compliant (but not really) supply :)

I do not regret my purchase. I do not scream up in the air like somebody here claimed. I did try something and it taught me something. In the spirit of "makerdom", i think that would be considered good practice. I like cheap stuff. We all do. That is why this thing (the Pi i mean) exists. I can still use this thing to charge my "cheap" phone which doesnt even have fast charging. What comes funny to me is that somebody said that "you can also charge your ipad with the official charger". Do you really think that i own an ipad? I mean c'mon.

jason_kidd wrote: ↑

Thu Aug 22, 2024 2:43 pm

But still doesn't make it right paying 2 pounds for just one glass of sugar filled caffeinated thing?? from Starbucks

Don't forget you have to pay for the private jet commuting of their CEO.

Location: 345th cell on the right of the 210th row of L2 cache

jason_kidd wrote: ↑

Thu Aug 22, 2024 2:43 pm

The official power supply is sold for 14.62 GPB here (official reseller). I paid 4.50 GPB for the one i bought (including the cable). For 10 pounds, i can buy 1 KG of ground coffee, which would last me around 3 months or so. I confess though, it would not be very good coffee :)

My experience is the worse the coffee the longer it lasts. Maybe grinding the coffee finer and adding a pinch of cocoa powder would help. I don't have a similar solution for power supplies. The worse a power supply the shorter it lasts.

I had enough bad experiences with ATX supplies in the past that I consider a good power supply to be the most important component of a computer. In particular, a fast computer is not useful in any way if it crashes or sets something on fire.

I think USB power delivery is complicated. In my opinion PD is also too expensive for the hobbyist and not reliable enough for commercial use.

ame wrote: ↑

Thu Aug 22, 2024 11:22 am

jamesh wrote: ↑

Thu Aug 22, 2024 8:14 am

I do find it odd that we make a very cheap, very high quality, fully compliant power supply which is 11ドル.60 incl. VAT in the UK (Pimoroni, now), and people still buy other power supplies to save at most a pound or two. Less than the cost of a coffee.

I can sort of see that people who already have a PD supply might be slightly miffed, but its still only 11ドル.60, and saves a lot of grief. And it seems likely that if they have another PD supply, they are going to want to use it for its original purpose at some point, meaning the Pi cannot be used.

I find it odd that you didn't let the Pi 5 negotiate a higher voltage and lower current, as provided by so many other off-the-shelf power supplies.

The argument that it would make the Pi 5 more expensive is negated by the fact that you have to buy the custom PSU anyway.

Three reasons that have already been stated multiple times.

* Cost of components
* No space for components
* Extra power components create a lot more heat, and the Pi 5 is already quite a warm device.

Software guy, working in the applications team.

jason_kidd wrote: ↑

Thu Aug 22, 2024 2:43 pm

I do not regret my purchase. I do not scream up in the air like somebody here claimed. I did try something and it taught me something. In the spirit of "makerdom", i think that would be considered good practice. I like cheap stuff. We all do. That is why this thing (the Pi i mean) exists. I can still use this thing to charge my "cheap" phone which doesnt even have fast charging. What comes funny to me is that somebody said that "you can also charge your ipad with the official charger". Do you really think that i own an ipad? I mean c'mon.

Actually.... I *don't* like "cheap" stuff. What I like is *inexpensive* stuff of good quality. The official PSUs deliver that.

jamesh wrote: ↑

Thu Aug 22, 2024 8:14 am

I do find it odd that we make a very cheap, very high quality, fully compliant power supply which is 11ドル.60 incl. VAT in the UK (Pimoroni, now), and people still buy other power supplies to save at most a pound or two. Less than the cost of a coffee.

I can sort of see that people who already have a PD supply might be slightly miffed, but its still only 11ドル.60, and saves a lot of grief. And it seems likely that if they have another PD supply, they are going to want to use it for its original purpose at some point, meaning the Pi cannot be used.

I suspect expectations inertia is the reason, among those grumbling. IIRC there was a time ~8-10 yrs ago when people like me perceived the Pi as the clever hub of a parts bin computer. You added your own mouse, keyboard, monitor, storage, and other peripherals. At the time I think it wasn't unusual to repurpose a phone charger (if not for the 3B, then for the Pi Zero) or something like that to act as power supply. Changing that expectation, that you only need to buy the board and can outfit the rest of the Pi setup with stuff you already have, isn't easy when that's the heuristic people to which some people are anchored.

For people new to SBCs/Pi. often coming from laptop/desktop world, they're not used to power supplies being an "extra" in terms of what's included in the quoted price for the computer. In light of how many problems seem to be associated with non-official PSU, one wonders why it's not just included (and priced to reflect that). Perhaps a signficant number of Pi (in non-desktop use) are used with some other means of powering it, and that's why?

cspan wrote: ↑

Thu Aug 22, 2024 7:32 pm

I suspect expectations inertia is the reason, among those grumbling. IIRC there was a time ~8-10 yrs ago when people like me perceived the Pi as the clever hub of a parts bin computer. You added your own mouse, keyboard, monitor, storage, and other peripherals. At the time I think it wasn't unusual to repurpose a phone charger (if not for the 3B, then for the Pi Zero) or something like that to act as power supply. Changing that expectation, that you only need to buy the board and can outfit the rest of the Pi setup with stuff you already have, isn't easy when that's the heuristic people to which some people are anchored.

When the Model B was launched, there was a stated assumption that a charger rated for 700mA or more could be used as a PSU. It was, so far as I can tell, assumed that pretty much everyone would have such chargers lying around unused. It rapidly became apparent, especially as follow---on models, such as the Pi2B, showed up that chargers were, generally speaking, not up to the task and quality PSUs were a far, far better option.

I can't speak for anyone else, but I've found that, over the years, there are a lot of uses for official RPT PSUs besides powering Pis. They will reliably charge phones and tablets, for instance. As there has been a move away from including a "charger" with every device, and a move towards standard power connection connectors, that is doubly true. At this point, I find myself buying a lot more PSUs than Pis. That way, if I need a 5v source, I've got them to hand. If I have a Pi that gets moved around, I can leave the PSU in place where it normally lives and have another for travel. If I'm on a trip with multiple people, I can loan out PSUs as needed (someone is *always* missing their "charger").

My daughter and her husband recently took a trip in the company of a elderly writer who needed someone to look after him. Since they all went to Glasgow, and I happened to have--through curious circumstances--a pair of UK Pi4B PSUs, I sent them with her to help cover any charging needs. (I kind of miss the official "universal" PSUs, though I understand why that idea was dropped.)

cspan wrote: ↑

Thu Aug 22, 2024 7:32 pm

For people new to SBCs/Pi. often coming from laptop/desktop world, they're not used to power supplies being an "extra" in terms of what's included in the quoted price for the computer. In light of how many problems seem to be associated with non-official PSU, one wonders why it's not just included (and priced to reflect that). Perhaps a signficant number of Pi (in non-desktop use) are used with some other means of powering it, and that's why?

There is, it is called the Raspberry Pi 5/4/400 Desktop kit, Pi5 is 130ドル. They should be directed toward that.

Other ways people might be using them PoE,. VIA GPIO via Pi4 PSU at 3A, via modern charger bu at 3A

But they just need to read the specifications or pointed iowarss them by the seller. I say that as phone mostly don't come with the charger and they're even more expensive (for both) so people use the old 2A chargers with cables or the computer USB outlet /modern plug socket with them built in, and moan it charges slowly. Mostly because they didn't buy it at purchase time.

Recent phones I have bought (tbh, not that recent, I do not update my phone for the fun of it) have not come with power supplies, just a USB cable. So I actually use Pi power supplies to charge both uUSB and the rest of the family use Pi USB-C power supplies. They are actually as cost effective as any other power supplies, usually cheaper than the phone manufacturers, and at least as good a quality.

Software guy, working in the applications team.

jamesh wrote: ↑

Fri Aug 23, 2024 7:09 am

Recent phones I have bought (tbh, not that recent, I do not update my phone for the fun of it) have not come with power supplies, just a USB cable. So I actually use Pi power supplies to charge both uUSB and the rest of the family use Pi USB-C power supplies. They are actually as cost effective as any other power supplies, usually cheaper than the phone manufacturers, and at least as good a quality.

The 100ドル phone I bought last year came with a charger and a USB cable. I did buy an electric toothbrush last year that came only with a USB powered charging base but no charger.

There was a coupon in the box for a free charger along with some virtue signalling about reducing e-waste by shipping the charger separately. As far as e-waste goes, the button on the toothbrush broke within a year. I wish I hadn't been too lazy to get the charger. It might have powered a Zero.

ejolson wrote: ↑

Thu Aug 22, 2024 8:23 am

redvli wrote: ↑

Thu Aug 22, 2024 7:16 am

Anyhow I bought some coin-sized USB-C PSU modules that implement USB-C PD, those can use something typically 9-36V, low-voltage, no risks for electrocution.

I'd like a coin-sized DC to DC power module that negotiates 5V at 5A with USB-C power delivery.

Can you make a specific recommendation?

This one converts USB-PD to 5V 5A https://pichondria.com/usb-pd-2-0-3-0-t ... berrypi-5/ using a buck regulator and USB-PD negotiation. Since most adapters do not have this 5A mode, this board made sense to me. It just uses USB-PD negotiation to get higher power from the normal USB-PD adapters (which has higher voltage option and lower currents) and then converts it down to 5V.
It is like 6cm long though. It also has soldering pad for something like batteries.

When I connected Apple adapters, it went to some 15-20V input. So, it should work with that voltages comfortably. The manufacturer says it needs at least 6V to turn on.

The problem with 5V 5A negotiation might be that the connectors of these converters will drop significant voltages. If cables are present between adapter and converter, that drops more voltage as well. The voltage drop gets very worse at this 4-5A range. Special cables might make sense at very high currents.

johnny7 wrote: ↑

Fri Aug 23, 2024 10:29 am

The problem with 5V 5A negotiation might be that the connectors of these converters will drop significant voltages. If cables are present between adapter and converter, that drops more voltage as well. The voltage drop gets very worse at this 4-5A range. Special cables might make sense at very high currents.

To avoid voltage drops, the 5A connections should use at least 18AWG cables (lower numbers better), as short as possible. At the converter's higher input voltage, the current (and therefore voltage drop) is proportionately less, and also less significant as a proportion of the voltage -- but cables should still be thick and short.

The "negotiation" is irrelevant to the voltage loss -- given that the Pi needs 5V (within 5%) and given that its current needs are determined by its workload and peripherals, whether 5A is negotiated or not, the actual current used is the same, within the PSU's limit.

I'm not sure what you mean by "special cables". There are of course many unsuitable cables, but "thick and short" covers the needs. Also, avoid having more plugs and connectors than necessary. If you are making cables, ensure the connectors are rated for 5A.

Location: 345th cell on the right of the 210th row of L2 cache

davidcoton wrote: ↑

Fri Aug 23, 2024 10:50 am

johnny7 wrote: ↑

Fri Aug 23, 2024 10:29 am

The problem with 5V 5A negotiation might be that the connectors of these converters will drop significant voltages. If cables are present between adapter and converter, that drops more voltage as well. The voltage drop gets very worse at this 4-5A range. Special cables might make sense at very high currents.

To avoid voltage drops, the 5A connections should use at least 18AWG cables (lower numbers better), as short as possible. At the converter's higher input voltage, the current (and therefore voltage drop) is proportionately less, and also less significant as a proportion of the voltage -- but cables should still be thick and short.

The "negotiation" is irrelevant to the voltage loss -- given that the Pi needs 5V (within 5%) and given that its current needs are determined by its workload and peripherals, whether 5A is negotiated or not, the actual current used is the same, within the PSU's limit.

I'm not sure what you mean by "special cables". There are of course many unsuitable cables, but "thick and short" covers the needs. Also, avoid having more plugs and connectors than necessary. If you are making cables, ensure the connectors are rated for 5A.

I used their cable which was supplied with the board, and it works. It is a USB-C to USB-C. It is short, about 15-20cm, as you have mentioned. But then, to check the drop, I also made my own cable connector using the male USB-C connector bought, which was rated for 5A. Something like https://wmsc.lcsc.com/wmsc/upload/file/ ... 464651.pdf

The connector was actually having a very significant loss than the cable when I used a thick-short cable. LLCR for the above connector is about 40mOhm for VBUS, which I believe would be about the resistance of the contact. The cable was dropping significantly less voltage as it was thicker when compared to the connector. I used a AWG 14 cable at 5cm.

Regarding negotiation, what I meant was the negotiation between the normal adapter and the Pi. What I meant was that, if 5A is negotiated and about 4A is drawn, if the cables are not very short and thick as you have mentioned, the cable might end up losing significant voltage over it. We both have the same point to make. Thick, short, good connector.

By special cables, I meant, cables which are very short and made with thicker conductors, with 5A or better rated connectors. The normal cables available in my country are usually longer, though rated for 5A. They are usually designed for mobile phones. I used a One Plus Dash Charging USB-C to USB-C cable (65W) 6.5A rated at 5V cable which was the one easily available, and it ended up losing very much voltage at 4-5A. Shorter cables were hard to find in my nation, at least, which were rated for 5A. So, it made it hard for me to get a high rated, short length cable. There were many cables rated for 5A or better, but they ended up dropping voltage a lot as they were long.

Since my cable assembly wasn't that great, I ended up using their cable after I had fun with the custom cable.

If the connector-cable assembly had about 40-50mOhm resistance, it meant a drop of 200mV to 250mV at 4-5A. Removing the connector improved this a lot for me.

Apologize for the confusion caused as we both were having the same point.

That board also had soldering pad. So, it looked better wrt to the voltage when I soldered the output of the 5V converter board and used single connector for Pi's input. The voltage drop over the cable reduced a lot when I did this.

jamesh wrote: ↑

Fri Aug 23, 2024 7:09 am

Recent phones I have bought (tbh, not that recent, I do not update my phone for the fun of it) have not come with power supplies, just a USB cable. So I actually use Pi power supplies to charge both uUSB and the rest of the family use Pi USB-C power supplies. They are actually as cost effective as any other power supplies, usually cheaper than the phone manufacturers, and at least as good a quality.

+1
That's my Standard Operating Procedure, as well. It extends all the way up to my grandson's Chromebook, for which I have provided a Pi4B PSU--and it fine and charges from that. So not only phones, but tablets, PayPal card readers, powerbanks, and that Chromebook.