This page (revision-30) was last changed on 2019-12-23 04:14 by Murray Altheim

This page was created on 2019-12-23 01:01 by Murray Altheim

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USB Power Supplies
USBPowerSupplies

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At line 11 changed one line
products. Apple is by far the worst: they sell two adapters (listed as the ''Apple 87W USB-C Power Adapter'' and the ''96W USB-C Power Adapter'') that are likely the most expensive on the market and are not showing their output ratings in watts but seemingly their power requirements, i.e, not what they __deliver__ but what they __use__. Of course it says nothing about this on the box.
products. Apple is by far the worst: they sell two adapters (listed as the ''Apple 87W USB-C Power Adapter'' and the ''96W USB-C Power Adapter'') that are likely the most expensive on the market and are not showing their output ratings in watts but seemingly their power requirements, i.e, not what they __deliver__ but what they __use__. Of course it says nothing about this on the box. It's 87 watts, right?
At line 13 changed one line
I made the mistake of buying the 87 watt unit for NZ$120 (wow!), opening the box and finding in fine grey print on the adapter a confusing bunch of different amperage ratings at voltages, but at 5 volts the unit delivers 5 volts at 3 amps. To give you an idea of how far this is off from that advertised 87 watt promise, delivering 87 watts at 5 volts should be showing __17.4 amps__. Apple are clearly using 87 watts to deliver 15 watts (3 amps at 5 volts) of power. You can check this yourself by using an online
Apple is really relying on the ignorance of its customers here.
I made the mistake of buying the 87 watt unit for NZ$120 (wow!), opening the box and finding in fine grey print on the adapter a confusing bunch of different amperage ratings at voltages, but at 5 volts the unit delivers 5 volts at 3 amps (i.e., 3000 mA or milli-amps). To give you an idea of how far this is off from that advertised 87 watt promise, delivering 87 watts at 5 volts it should be delivering __17.4 amps__. Apple's unit is clearly using 87 watts to deliver 15 watts (3 amps at 5 volts) of power. You can check this yourself by using an online
At line 19 added 2 lines
What's strange is that Apple has delivered honest reporting on its other units. Their tiny [5 watt adapter|https://support.apple.com/library/content/dam/edam/applecare/images/en_US/accessories/Adapters/5w-adapter-tech-spec.png] delivers 5 volts at 1 amp. Their [12 watt unit|https://support.apple.com/library/content/dam/edam/applecare/images/en_US/accessories/Adapters/12w-adapter-tech-spec.png] delivers 5.2 volts at 2.4 amps. They provide technical specification for these smaller models, but the Technical Specification for the 96 watt model just says "USB C". What gives?
At line 22 changed 2 lines
If the Raspberry Pi people way your Pi needs 3 amps, that's not how much power the adapter is using, it's
how much it's delivering.
If the Raspberry Pi people way your Pi needs 3 amps, that's not how much power the adapter is __using__ (including power wasted through conversion, heat, etc.), it's how much it's required to __deliver__.
At line 28 added 6 lines
Some of the units I've found say they supply 3 amps but over two separate USB connections, or say they deliver 3.1 amps but have two USB sockets, so is that 3.1 amps for the whole unit or only 1.55 amps per socket? It's hard to tell when vendors aren't honest. I've got one USB charger that has this on the bottom:
{{{
Input: AC 100-240V~, 50/60Hz 0.8A Max
USB 1 Output: 5V
}}}
This page (revision-30) was last changed on 2019-12-23 04:14 by Murray AltheimTop