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EEVblog:

--- Quote from: PaulReynolds on June 25, 2019, 02:27:41 pm ---
--- Quote from: madires on June 25, 2019, 02:07:32 pm ---I think we should also look at the financial side of charging/powering devices. Some numbers about recharging your gadgets via the standard SMPSU based on the average price for power in Germany (EUR 0.30 per kWh) which is quite expensive. The yearly cost for recharging daily:
- smartphone EUR 1 - 1.50
- tablet EUR 4
- laptop EUR 10

Any wireless charging solution has to compete with those numbers. A few bucks more for the convenience of not dealing with a cable might be acceptable. But anything much less efficient or much more expensive is a show stopper.

--- End quote ---

On a large scale and for a business there does need to be a compelling case that the cost of inefficient charging does allow a valuable function to be performed or saves other expensive functions like labour. For individuals it's a matter of convenience and people will pay for that - I can guarantee you 99% of people have no idea what it costs in a year to charge your phone every day. So if you ask it like this "Imagine you never have to plug in your phone, ever, and it just keeps being powered up. What would you pay every year for that convenience?" and then say "$1, $10, $100, $1000". Basically everyone will say yes to $1 and $10, I think a majority (but not large majority) will say yes at $100, and basically no-one will say yes at $1000. So that says that with a yearly charge cost of say $1 at 100% efficiency, you need to keep real world efficiency at >1%, or ideally >10% (very hard to do but you can get marketing covering for that). So while you are correct, I actually don't think this is the primary show stopper (the massive inefficiency meaning 500 million people block doing this every day adds around 200 PWh to the yearly power demand, not very green).

--- End quote ---

That's why regulations like EnergyStar exist, to protect ignorant Joe Public from being able to choose deliberately inefficient designs.
EEVblog:

--- Quote from: madires on June 25, 2019, 02:07:32 pm ---I think we should also look at the financial side of charging/powering devices.
--- End quote ---

No point when it's demonstrably not practical from a usability point of view.
nctnico:

--- Quote from: madires on June 25, 2019, 02:07:32 pm ---I think we should also look at the financial side of charging/powering devices. Some numbers about recharging your gadgets via the standard SMPSU based on the average price for power in Germany (EUR 0.30 per kWh) which is quite expensive. The yearly cost for recharging daily:
- smartphone EUR 1 - 1.50
- tablet EUR 4
- laptop EUR 10

--- End quote ---
Nobody cares about efficiency. Especially if the costs is just a drop in a bucket. For example: A typical European refrigerator consumes between 250kWh and 600kWh each year (between 60 and 200 euro depending on the fridge and where you live).
StillTrying:

--- Quote from: nctnico on June 25, 2019, 11:28:21 pm ---
--- Quote from: madires on June 25, 2019, 02:07:32 pm ---- smartphone EUR 1 - 1.50
- tablet EUR 4
- laptop EUR 10

--- End quote ---
Nobody cares about efficiency. Especially if the costs is just a drop in a bucket.

--- End quote ---
I think they'd notice when when their yearly charging costs increase from 15.5 to 3,000.

jonovid:
is been blasted by KW's of ultrasound all day dangerous?  and its got to be the most inefficient wasteful way to power anything!
you lots of coal fired power stations just to run it  :-DD
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