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It’s finally here: Porsche puts wireless EV charging into production (electrek.co)
submitted 1 month ago by to c/electricvehicles@slrpnk.net
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[–] 8 points 1 month ago* (last edited 1 month ago) (10 children)

The article mentions "about 90%" of efficiency (i understand it as additional losses when compared to wired charging).

I'd say that's quite bad, and can not be easily disregarded.

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  • [–] -4 points 1 month ago* (last edited 1 month ago) (7 children)

    That's not in the cable, that's the "end to end" charging system, and yes, that is comparable to wired charging. Efficiency in the wireless transmission is 96-99%, depending on distance and alignment. This has been studied extensively. Like I said, this is not new technology. Have a web search.

    Here's a couple articles to get you started:
    https://electreon.com/blog/debunking-wireless-ev-charging-myths/

    https://www.energysage.com/ev-charging/wireless-ev-charging/

    https://www.witricity.com/blogs/comparing-efficiency.php

    https://www.osti.gov/servlets/purl/1876291

    https://www.ornl.gov/news/ornl-demonstrates-120-kilowatt-wireless-charging-vehicles#:~:text=97%20percent%20efficiency%2C%20which%20is%20comparable%20to%20conventional%2C%20wired%20high%2Dpower%20fast%20chargers

    https://www.mckinsey.com/industries/automotive-and-assembly/our-insights/perspectives-on-wireless-and-automated-charging-for-electric-vehicles#:~:text=A%20wireless%20inductive%20charging%20system%20is%20at%20least%20one%20or%20two%20percentage%20points%20more%20efficient%20than%20a%20DC%20%5Bdirect%20current%5D%20fast%20charger%20at%20the%20same%20power%20level.

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  • [–] 8 points 1 month ago* (last edited 1 month ago) (5 children)

    Mate, focus (and would you please avoid shoving advice and links when not openly asked?!): 90 percent efficiency claim is directly in the OP.

    The number can even be confirmed at the press release by Porsche (which boldly claims charging efficiency to be "over 90 percent").

    Focus and keep the number in your mind (the number found BOTH in the OP and confirmed at the Porsce's press release) while trying to explain where the losses do take place.

    I totally understand, that losses do happen when the electricity is converted first to DC and then back to high freq.AC and during the inductive charging itself.

    This is expected and is a convenience tax of sorts (getting rid of cables and plugs) and yet, it's less efficient than plugging directly. Once again, only 90℅ efficient.

    I don't have the crayons to explain it to you any simpler 8)

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  • [–] -3 points 1 month ago* (4 children)

    Mate, focus (and would you please avoid shoving advice and links when not openly asked?!): 90 percent efficiency claim is directly in the OP.

    Mate, focus. I did not dispute this number. I address it directly, in the comment you replied to. Come back when you have facts instead of just personal insults.

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  • [–] 2 points 1 month ago* (last edited 1 month ago) (2 children)

    If you fail to understand what's been discussed and compared to (i.e., wireless vs wired charging)

    and yet keep your arrogant stance towards others (in the now deleted comment literally you_were yelling at someone to shut their mouth look this stuff up before starting to write about it

    or another arrogant "have a web search" thrown randomly at me),

    then why would you act surprised at insults as a response to your regular toxic behaviour?!

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  • [–] 2 points 1 month ago* (last edited 1 month ago)

    That's not in the cable

    Well, Sherlock, good catch! That's an affing wireless charging system. /S

    The 90 % efficiency claimed in the OP - is the claimed TOTAL efficiency of the PRODUCT by Porsche (wireless charging station). Of course "it's not in the cable" (rofl), it's in ALL the electric components of the system - which is OVERALL less efficient than a similar (as in function and provided power) charging station.

    Similar, but noticably POORER in efficiency (~ it has 10% more losses than a similar wired charging solution). As even the Porsche marketing claims.

    If you still fail to get it - then you might want to follow your own unsolicited advice:

    Have a web search.

    I can rewrite the whole press release by Porsche for you, but i can not understand it for you.

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