On 10/11/25 15:27, Nathan Lewis wrote:
> My experience with most of the “low cost” switching regulators from
> Amazon and AliExpress are that they’re pretty much trash.
>
> I use a Pololu 5V 7A regulator I got like 15 years ago in Kybernetes 2.
> It barely gets perceptibly warm at a 5A load, meanwhile the regulators
> from amazon get dangerously hot at even a 3A load.
>
> The only exception has been those Tobsun 5V 10A regulators. I’m using
> one in the LeKiwi robot and it’s been great.
I'm using an [old] RC UBEC ;-)
https://hobbyking.com/en_us/turnigy-8-15a-ubec-for-lipoly.html in
EntdeckerL (at the 5V setting!!). That did not let me down yet;-)
-- Marco
>
> - Nathan
>
> On Sat, Oct 11, 2025, at 3:04 PM, Survy wrote:
>> I have been using a RPi 5 for about a year on my mobile robomagellan
>> robot and had A LOT of power issues at first.
>>
>> Here's what finally worked for me:
>>
>> * This step down voltage regulator from Pololu can supply 5V,
>> 5.5A:
https://www.pololu.com/product/4091
>> * Since it has an input voltage range of 5.5V to 50V, I can use it
>> * I power the RPi via USB-C connected to the voltage
>> regulator:
https://www.amazon.com/dp/B091CRLJM2
>>
>> Hopefully this is useful to someone else also using the RPi 5 when
>> using the official power supply isn't possible (for example on a
>> mobile robot).
>>
>> For what it's worth, here's the output to the "vcgencmd" command from
>> the video.
>> vcgencmd get_config usb_max_current_enable
>> usb_max_current_enable=0
>> This means that max current enable is not set. I might try setting
>> that to 1 for peace of mind, but I haven't had any power issues since
>> switching to the Pololu voltage regulator. Before that I got a ton of
>> undervoltage messages in dmesg.
>>
>> Cheers,
>> Survy
>>
>> On Tuesday, September 23, 2025 at 8:26:11 AM UTC-7 Sergei Grichine wrote:
>>
>> Here is a video explaining why our Pi5's on the robots (off
>> batteries) don't perform properly:
>>
>>
https://youtu.be/PddIeZP-wgw <
https://youtu.be/PddIeZP-wgw>
>>
>> There are settings that fix the problem (use caution).
>>
>> Here is an "easy solution":
>> --
>> Best Regards,
>> -- Sergei
>>
>>
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