Agree with your observation that the previous response was, er, less than useful.
Got one. Use it often.you can buy power measuring devices that plug into your wall outlet. They're normally designed for measuring how expensive your TV is or an fridge, etc, but they can also tell you watt draw, amp draw, peak load and a variety of other useful info.
One might want to know how much current a particular setup uses, including Pi and all attached devices. Or--as I did for some tests--one might want to know how much current was needed for a battery powered device, so one might hook up a voltage and current monitor between the battery and the Pi. It could also be used to find out how far the voltage drops under load from a given PSU. All sorts of uses beyond just curiosity.
Voltage: DC 0~25V
Current: 50mA~6A (Adapting QC2.0)
Temperature Coefficient: <100PPM/℃
Operating Temperature: 0~60℃
Relative humidity below: 80%
Stand by current: <30mA
Dimensions: 65L x 23W x 14H mm
There are clamp meters available that can measure DC current however the input power supply (+) and (-) wires must be separated as the clamp must be placed over 1 wire only.
The low voltage limit for Raspberry Pi's is 4.75V. The maximum limit is 5.25V. There are very few 5V USB spec power supplies that supply more than 4.9V while supplying 2A.
While I personally agree, the port is perfectly solid, your numbers may be a tad overestimated.W. H. Heydt wrote: ↑Thu Oct 12, 2017 1:59 amHow many hundreds of thousands of time do you plan to plug and unplug your power connection?
I agree hard to see the difference between a £6 model and a £73 model. The link hopefully showed cheaper alternatives below that expensive model.Martin Frezman wrote: ↑Tue Oct 10, 2017 1:47 pmOf all the ideas presented so far, I think the "USB Power Meter" idea is probably going to be the most workable.
Having looked at them on Amazon, the thing that is curious is the difference in price between seemingly (more or less) identical devices. For example, the one at the link posted earlier (at amazon.uk) was 74 pounds (i.e., something like $100) (wow!). On amazon.com (i.e., in the US), there are a couple of them at about $11 (which is probably about the same as the 6 pound figure quoted above), but then there is one that is $58 and others even higher than that. Yet, they all look about the same - hard to tell from the text if there is any real difference between them.
Recent experience shows that sometimes once is enough.How many hundreds of thousands of time do you plan to plug and unplug your power connection?
Ha!After I weld these 2 gauge jumper cables to my GPIO my Pi will get plenty of power!