• Dec 30th 2010 at 6:57PM
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The CHAdeMO fast charging protocol was developed by the Tokyo Electric Power Company (TEPCO) along with Toyota, Nissan, Mitsubishi and Fuji Heavy Industries (Subaru), CHAdeMO, a DC fast-charging protocol for electric vehicles, is used for all Level 3 chargers in Japan, but the U.S. has been reluctant to apply this single open standard to govern the quick-charge stations that either already are, or will soon be, installed here. However, according to the Japanese news outlet the Yomiuri Shimbun, the U.S. will take a stab at trying out the CHAdeMO system by installing 310 quick-charge stations throughout Arizona, California, Texas, Tennessee, Oregon and Washington State.
The Yomiuri Shimbun claims that the installation of the CHAdeMO chargers in the U.S. is:
The first time a large number of quick chargers using the CHAdeMO method will be used overseas and is seen as an initial step toward the Japan system becoming the world standard.
Industry observers agree, pointing out that successful testing of the quick-charge systems in the U.S. could lead to global adoption of the CHAdeMO protocol.

[Source: Green Car Congress]


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  • 21 Comments
      • 4 Years Ago
      Thanks skierpage, for the IEEE link to the J1772 level 3 proposed specs.

      Looks like it has taken the CHAdeMO spec. and improved on it. Slightly larger since it is an extension of the level 1 & 2 version so the space for the level 1 & 2 power pins is wasted, but has the significant advantage of a single plug on the car and a smaller access door. Also has a larger more robust latch, slightly higher voltage rating of 600 instead of 500 and large ground pin for safety.

      To my eyes, this is a superior design. Nissan has also said that they would retro-fit LEAFs with this new plug when it was ratified. I think the chances of the new J1772 design being adopted are excellent, and any chargers being installed to the CHAdeMO specification should be built with the expectation that they will be converted later to the J1772 specification.

      Since the new J1772 specification is expected to be ratified by August 2011, and it will take a similar time period to install the level 3 chargers, I think it is much more rational to simply delay the charger installations by a few months and make them to the new standard.
      • 4 Years Ago
      CHAdeMO was developed over a number of years and started testing in Japan half a decade ago. The bugs have been worked out and it is being scaled up no in Japan. These tests are about 5 years behind.

      • 4 Years Ago
      CHAdeMO plug must be significantly larger than the J1772 plug in order to handle the increased voltage and current.

      I couldn't find specifications for the CHAdeMO standard, but it goes something like this.
      Uses CAN bus communications to get info from the car about desired voltage and current (this can change during the charge period, such as reducing current when nearing full charge).
      Voltage can be up to 500 volts, not so sure about minimum, but one source said 50V.
      Current can be up to 125 amps. A little confused there because there was a mention about 200A (maybe future?).

      See: http://evsolutions.avinc.com/uploads/products/2_AV_EV50-FS_061110_fleet_dc.pdf

      So yes, this standard is good and needed for fast charge, but I think it should have the same communications protocol as the J1772. I agree with the need for two different plugs, but not two different protocols.

      J1772 was designed for up to 240Vac 80 amps but certified only to 30 amps.
      The SAE J1772 committee is working on a CHAdeMO-like design but staying with their already standardized protocol.

      I think governments should wait for the SAE J1772 committee to publish their high power specification before making a decision on which style to install.
        • 4 Years Ago
        The SAE J1772 DC standard may have a slightly larger plug (the extra area generally being the latch anyway), but the flipside is there is only one receptacle on the car. Surely that is a design and cost advantage?

        Given that everything in the US seems to be coming with J1772 level 2 charging, an increment to it seems to be the better way to go.

        Besides, the SAE one can handle more power.
        • 4 Years Ago
        ClipperCreek makes the TS-70 charging station that outputs 70A , it's the one that the Tesla Roadster uses (though with Tesla's connector, not SAE J1772).

        The reasons why people are making weaker charging stations is cost and few cars that can take more power. The Leaf only has a 3.3 kW on-board charger, supposedly upgrading to 6.6 kW soon. I don't know how much extra the Roadster's 16 kW on-board charger would cost, but I believe no other EV can take over 10 kW.

        It seems most Coulomb Technologies' MyChargePoint public charging stations being installed have a 240V, 30A SAE J1772 port.
        • 4 Years Ago
        Roy: "J1772 was designed for up to 240Vac 80 amps but certified only to 30 amps."

        Rema and Yazaki are only rated for 30 amps, but ITT makes a J1772 connector that can handle 75 amps, or 18kW (at 240V). I don't know why all the charger companies are going for 30A. It seems like a waste of build cost, and a waste of time for the vehicle owners waiting around to charge.
        • 4 Years Ago
        At Goiodcheer:
        At least here in the UK cooker circuits are 30 amp as standard, so perhaps the charge companies are sticking to what is currently normal.
        Perhaps also if they bumped it to 75 amps there would be more likely to be trouble with the local grid to support such high charge rates, so the cost of installation would increase as transformers and so on need upgrading.
      • 4 Years Ago
      Having a single standard for the world would be quite nice.
      • 4 Years Ago
      I suspect they are just reporting about the EV project being handled by ECOtality.
      • 4 Years Ago
      yet another plug standard.
      imagine if they thought ahead..

      get it right already. power levels of chademo in a plug much smaller than j1772.
      it doesn't have to be big to carry an enormous amount of power.
      a 10x10mm pin will carry 1000A no problem and CHAdeMO is less than 200A.

      it doesn't have to be big and clumsy like a damn gas station nozzle
        • 4 Years Ago
        D sonnier, it would be cheaper. it will weigh the car down less. that matters in engineering. it will live longer and because of that lithium is cheaper than lead acid batteries even at same capacity. today. and the final hint, try to realize there is no motor that needs to be cranked..

        think people. if I say something it's not because I need you to inform me of something blatantly obvious.
        • 4 Years Ago
        no Dave it would be cheaper in every way
        • 4 Years Ago
        roy, even if a 12V battery would be desirable, couldn't it be lithium.. couldn't it be much smaller..
        think a little roy
        • 4 Years Ago
        it's simplistic to think engineers do optimal designs. case in point, nissan put a lead acid starter battery in the nissan leaf.
        humans are surprisingly unintelligent
        • 4 Years Ago
        There is more than just a pair of conductors involved, there is also the insulation needed for the higher voltage, and communication lines to assure proper connection before activating the current, and safety features to prevent problems with electrical shorts and improper grounding.

        This was designed by engineers, they didn't make it bigger than necessary for the fun of it.
        • 4 Years Ago
        "they seem to have deliberately shaped and sized it like a refueling nozzle"

        They didn't seem to, they did. Like it or not, the vast majority of mid pack adopters always gravitate to the familiar. It's the way it is. It's why the first radios and TVs came in pieces of furniture and why early cars looked like buggy carts.
        • 4 Years Ago
        @Dan - Yeah, a lithium 12v battery would be a lot lighter, but it would also be a lot more expensive. There's a reason no-one uses lithium 12v batteries. Or even NiMH 12v batteries instead of the tried and true lead-acid 12v battery.
        • 4 Years Ago
        skierpage, all the time although not with me being a sad loser as the premise. but I am continually amazed and frustrated.
        in the case of J1772 I wouldn't go so far as to call them morons. it's a decent looking plug and only a little too big. the chademo plug is way too big. moist shoelaces can carry 125A.
        they seem to have deliberately shaped and sized it like a refueling nozzle and I'm sure they found the familiarity amusing and exhilarating and they were very proud of themselves but it was a mistake. they lack aggressive thinking. they just play it by the book and safe and that drags us down with overhead. also why the Volt is such a suboptimal design.

        a european 230V AC plug has about 327V peak voltage difference. the 500V chademo is not hugely different. and the wires in our cords are separated by only 1mm of cheap plastic.
        a slightly beefier looking wall plug could do the chademo standard. much smaller than the J1772. light and agile not much different from a lamp plug.
        heck I could make a completely safe plug with chademo level power that is plug compatible with standard european house wall socket. like this http://www.allproducts.com/manufacture100/yuyaoyingjia/product1-s.jpg
        the trick would be to have thicker copper just before and after the pins and it will carry 125A with easy. the pin separation is plenty for 500V too.
        just a small clip latch on top so it doesn't hang in the pins or a cylindrical fit and it's golden.

        try to think on your own instead of being a thoughtless child of status quo.
        • 4 Years Ago
        The SAE J1772 committee is considering making a DC version of the Yazaki plug, but it uses two additional chunky DC pins, so it's even bigger than CHAdeMO. See slides 10 and 15 of http://grouper.ieee.org/groups/earthobservationsSCC/IEEE_SAE_J1772_Update_10_02_08_Gery_Kissel.pdf . Supposedly SAE is evaluating this J1772 extension against CHAdeMO right now and will finalize the standard by June of next year.

        @Dan, Presumably you think the J1772 add-on engineers are also morons to make their DC pins so big. Do you ever wonder how everyone else can be "surprisingly unintelligent" while you're just a sad loser critiquing people who engineerin actual products because it's never done to the lofty standards of your mental masturbations?
        • 4 Years Ago
        Nissan put a 12v battery in the LEAF for the same sound reasoning that GM put one in the Volt. All accessories, lights, stereo, power windows etc. run off 12V. This is not just convenience because these accessories already exist, but for safety. A garage mechanic or stereo installer could not legally work with over 50 volts, and for obvious safety reasons I don't think it would be smart to have everything powered from the 400 volt main battery. You apparently have a low opinion of engineers, who are obviously much smarter than you.
        • 4 Years Ago
        Why use an expensive battery technology for the accessories when something tried and true and mostly cheap and ubiquitous is available?
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