UC Riverside team wins EPA design contest with lawnmower exhaust aftertreatment device
Sandia study finds more California gas stations could provide H2 than previously thought; NFPA 2 code

Daimler and BMW jointly to develop and implement common wireless charging technology

Daimler and BMW have agreed on jointly developing and implementing one common technology for wireless recharging high-voltage batteries of electric drive and plug-in hybrid vehicles.

The wireless charging system consists of two components: a secondary coil integrated into the under tray of the car and a primary coil integrated into a floor plate that can be placed on a garage floor for instance. Electrical energy is transmitted contact-free without the need for a cable, at a power rate of 3.6 kW and with a degree of efficiency of 90%.

Wireless charging of the S 500 Plug In HYBRID. Click to enlarge.

Mercedes-Benz will commence fleet testing of this “unplugged” technology with the S 500 Plug in HYBRID (earlier post) soon, in order to develop a real S-Class solution in recharging the high voltage battery in terms of comfort and ease of operating in the near future.

Mercedes-Benz will launch the S 500 Plug In HYBRID in September. It offers 325 kW (436 hp) of power and 650 N·m (479 lb-ft) of torque, accelerates in 5.2 seconds from zero to 100 km/h, and can go 33 km (20.5 miles) on electric power alone. It has certified fuel consumption of 2.8 liters for 100 kilometers (84 mpg US), equalling 65g CO2/km.

After the S 400 HYBRID and S 300 BlueTEC HYBRID, it is the third hybrid model in the S-Class range.



A decimal place went missing in that article. 33 km all electric range = 20.5 miles.

I almost got excited there for a minute.


Excellent idea: VW, Tesla, Volvo, Nissan and others should join in ASAP to arrive at an early standard.

Electrified vehicles manufacturer should accelerate the installation of standardized quick charge stations. It will soon be a high profit business.


I said wireless charging would become popular, but the guy who is NEVER wrong said NO!

Patrick Free

Putting tons of investments on dead-born 3.6KW model makes no sense to me today. I understand they also look at a 7KW evolution of this, that will have more interest.
For sure 3.6KW will work with meaningless 1st gen German PHEVs with "good for nothing" <10KWH batteries that require 2 x charges per day to do local commutes all electric wearing the battery in 5 years hence zero resale value for these PHEVs when used, but for current best smaller EVs already baring a decent 30KWH (> 100M EV range) allowing to do # 50M per day local commutes with one charge every 2 x days, so a good 3000 x cycles battery can last 20 years and reselling value of used EV/PHEV cars is great, it already reaches its limits, as with 30KWH you’ll need 8.33H to charge on 3.6KW charger, that exceeds the night period, while with 7KW it could do it in 4.3H only, leaving some head room for next BEVs with even larger packs to use it too.
Then look at current Teslas 60 and 85KWH, on 3.6KW they would need 17H or 24H today so just forget it, while with 7KW they could charge in 8.6 to 12H…, so even 7KW is already short for today best Tesla….
And this is not the end of the road. Tesla is planning for +30% in the short term with new Gigafactory means 111KWH, and targeting just after that the nirvana 500M / 650KM battery, that is expected # 160KWH.
So to be “future proof” and correctly anticipate on these next steps with residential recharging points, the minimum target would be the current German 22KW (wired) chargers allowing to slow charge 160KW in 7.3H the day after tomorrow, and to fast charge today small EVs in # 1H.
This is what I’d like to install in my home carpark when I’ll buy my 1st PHEV SUV hopefully next year if I find one with a decent all electric mode…
Then for wireless it may be a big challenge to get to same 22KW, so 7KW may be a decent partial charge step for the mid-term. But I would skip anything below that.



Your dream EV (a Tesla with 160 kWh battery pack and 550+ miles range) and dream wireless (15+ kWh) chargers will be around by 2020 or so.

Meanwhile, the new 7 passenger Volvo, AWD diesel PHEV, could be a good all purpose, low GHG, low fuel consumption vehicle for the next 6+ years.


Oh, the Mercedes and BMW set will definitely go for the wireless.  They really don't care about price or efficiency; they can afford $8/gallon gas too.  But everyone else?  Most people are cost-conscious.

Sometime this is going to spill over into debates about public infrastructure.  If the BMW can't use the J1772 plug at work, people are going to wonder why they bought the plug-in-without-a-plug.  That argues for having both, at least for the time being.


Eventually, there are no good reasons not to have both:

1) Wireless charging @ up to 10KW or so for private garages or charging points, public parking lots, at work parking places etc.

2) Wired, very quick DC charging points @ 160+KW (a la Tesla) or so using an International standardized connection together with automatic payment etc.

The comments to this entry are closed.