Adding a second OEM charger for 6.6kW charging - CANBUS hacking
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Thread: Adding a second OEM charger for 6.6kW charging - CANBUS hacking

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\r\n Default Adding a second OEM charger for 6.6kW charging - CANBUS hacking\r\n

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\r\n Howdy,
\r\nI am interested in adding a second OEM charger to a first-generation Volt to double the charging power from 3.3kW to 6.6kW. This is theoretically possible, according to work by EV developer mauswerkz, by creating a separate CANBUS network for the second charger. The CANBUS module would need to send info to the second charger based on what the car is telling the first charger to do.
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\r\nOf course, there would be HVDC and AC wiring work to do: possible replacement of the J1772 inlet and AC wiring with higher-current-capacity hardware, and duplicate or replacement wiring for the HVDC charger output. Also, it\'d be necessary to sniff the J1772 communication to see if there is adequate current from the EVSE to drive the second charger at full or partial power, or at all.
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\r\nI could see this being pretty useful for me and others that want to minimize gas use during trips that go beyond EV range. I tend to stay close to my rural home most of the time, but regularly take longer errand-running trips that would benefit from higher-power opportunity charging. It\'s not necessary or beneficial for most, but it would be a nice option for some.
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\r\nDoes anyone know of any existing work on adding a second charger, OEM or otherwise?
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\r\nHere are some more links from mauswerkz\' project, which uses a number of Volt parts:
\r\nhttps://hackaday.io/project/4649/logs/sort/newest
\r\nhttp://www.diyelectriccar.com/forums...er-133857.html
\r\nhttp://forums.evtv.me/?forum=403618
\r\nhttp://gm-volt.com/forum/archive/index.php/t-12958.html
\r\nhttps://hackaday.io/project/4649/log...he-small-stuff
\r\nhttps://hackaday.io/project/4649/log...-front-battery
\r\nhttps://hackaday.io/project/4649/log...ing-components\r\n
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    \r\n There have been several "tuners" on this board claiming that they can modify a Volt. Every one of them only talks about improving acceleration, particularly 0-60 time.
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    \nNo "tuner" has even claimed to use more of the battery\'s total capacity, improve the charging rate, or do anything else involving the battery. Either they have no idea why people buy Volts in the first place or they only know how to change some tables, not code, through the bus.
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    \nI wonder if these guys offer Corvette tunes that just improve the mpg.\r\n
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    \r\n Although this doesn\'t answer the OP\'s question, I disagree with Mike\'s comment.
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    • A lot of "tuners" in this forum have modified their vehicles.
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    • The most common modification is to make the accelerator pedal more sport like by default.
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    • A few of us altered the ICE for better mileage.
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    • One improved his 0-60 time, but required the ICE to be running and got a CEL during the process.
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    Regarding using a Corvette tune, that\'s not going to work. Our Volts are heavy and the ICE doesn\'t really idle since it\'s always maintaining the HV battery so a better tune would come from a high compression flex fuel V8 pickup.\r\n
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    \r\n Quote Originally Posted by colchiro\r\n View Post\r\n
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    Although this doesn\'t answer the OP\'s question, I disagree with Mike\'s comment.
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    • A lot of "tuners" in this forum have modified their vehicles.
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    • The most common modification is to make the accelerator pedal more sport like by default.
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    • A few of us altered the ICE for better mileage.
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    • One improved his 0-60 time, but required the ICE to be running and got a CEL during the process.
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    Regarding using a Corvette tune, that\'s not going to work. Our Volts are heavy and the ICE doesn\'t really idle since it\'s always maintaining the HV battery so a better tune would come from a high compression flex fuel V8 pickup.
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    \nAre you personally aware of the engine MPG mods for better mileage? I\'d love to hear more about how well that may have worked.\r\n
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    \r\n Quote Originally Posted by colchiro\r\n View Post\r\n
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    Although this doesn\'t answer the OP\'s question, I disagree with Mike\'s comment.
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    \n
    • A lot of "tuners" in this forum have modified their vehicles.
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    • The most common modification is to make the accelerator pedal more sport like by default.
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    • A few of us altered the ICE for better mileage.
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    • One improved his 0-60 time, but required the ICE to be running and got a CEL during the process.
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    \nRegarding using a Corvette tune, that\'s not going to work. Our Volts are heavy and the ICE doesn\'t really idle since it\'s always maintaining the HV battery so a better tune would come from a high compression flex fuel V8 pickup.
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    \nDefine "a lot". 3? 6? 24? 10,000?
    \nNone of the "modified" examples involve what the OP is asking about. All involve the ICE. 2 out of 3 seem suspiciously similar to what MikeG said: acceleration. The third kicks on the ICE.\r\n
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    \r\n Quote Originally Posted by colchiro\r\n View Post\r\n
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    Although this doesn\'t answer the OP\'s question, I disagree with Mike\'s comment.
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    • A lot of "tuners" in this forum have modified their vehicles.
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    • The most common modification is to make the accelerator pedal more sport like by default.
    • \n
    • A few of us altered the ICE for better mileage.
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    • One improved his 0-60 time, but required the ICE to be running and got a CEL during the process.
    • \n
    Regarding using a Corvette tune, that\'s not going to work. Our Volts are heavy and the ICE doesn\'t really idle since it\'s always maintaining the HV battery so a better tune would come from a high compression flex fuel V8 pickup.
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    \nYou\'re basically agreeing with me.
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    \nNone of the tunes affect the battery in any way.
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    \nWhile the tuners have not disclosed their methods, other posters have strongly suggested that the tunes only involve table changes. I assume that GM has a standard format for these tables, so finding the right cells sounds doable. Decompiling the actual code has not been demonstrated.
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    \nMy Corvette comment was meant as sarcasm - you don\'t buy a Corvette for superior mpg and you don\'t buy a Volt for red hot acceleration.\r\n
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    \r\n OK, thanks for the threadjacking guys. I was hoping to discuss the addition of a second 3.3kW OEM charger to a Gen 1 Volt. Any comments on that?\r\n
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    \r\n Quote Originally Posted by nedfunnell\r\n View Post\r\n
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    OK, thanks for the threadjacking guys. I was hoping to discuss the addition of a second 3.3kW OEM charger to a Gen 1 Volt. Any comments on that?
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    \nAgreed - don\'t you just love the internet
    \r\nIt does sound interesting, however it\'s way above my paygrade. Hopefully this becomes a useful discussion.\r\n
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    \r\n Quote Originally Posted by mikeg3\r\n View Post\r\n
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    There have been several "tuners" on this board claiming that they can modify a Volt. Every one of them only talks about improving acceleration, particularly 0-60 time.
    \n
    \nNo "tuner" has even claimed to use more of the battery\'s total capacity, improve the charging rate, or do anything else involving the battery. Either they have no idea why people buy Volts in the first place or they only know how to change some tables, not code, through the bus.
    \n
    \nI wonder if these guys offer Corvette tunes that just improve the mpg.
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    \nDon\'t conflate why YOU purchased a Volt with why "people" buy Volts. This anti "tuner" attitude is infuriating.
    \n
    \nAnd yes, tuners DO offer Corvette tunes specifically to improve the mpg... why on earth wouldn\'t they do this? Oh, right... tuners are neanderthals that are hell bent on destroying the earth, I forgot!
    \n
    \nI purchased the Volt for 2 reasons. I love the quiet comfortable driving experience of an electric drivetrain, and because I hate waste of any kind. Driving a high powered aftermarket tuned turbocharged 300 HP Miata on the weekends is a blast, driving it as a daily driver commuter car is a waste...
    \n
    \nNow back on topic, I don\'t know of anyone working on the Volt to increase battery charge rate, but twright is probably on the right track pointing you towards people that have used the Volt charger in a custom configuration on different vehicles. Good luck finding a tuner who knows Volt code that hasn\'t left this forum in disgust due to the bad attitude of the many "enlightened" volt owners here.
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    \r\n I would think the simplest route would be to find a higher powered charger that fits in the space of the existing 3.3 unit (they probably exist by now as electronics get smaller over time) and build the aforementioned translation unit to make the car thing it is talking to the original lear unit (serial # 123467) and everything is A-OK
    \n
    \nFrom what I can gather of the 240V charging process, the car just says "Hey, charge time" to the lear unit, it does it\'s job and then sends a message back to the main computer "I\'m done". I know this because it always defaults to 83.5% SOC when charge complete happens. This means it\'s a programmed response vs a measurement. It will update to a measured/calculated SOC at a later time.
    \nThere is likely no monitoring of kW rate or anything of that sort.
    \nThe computer is only involved in 120V charging as part of the 8A/12A limiting process.\r\n
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    Hidden Content
    \r\nYear 1: 8101km | 97.5% EV | 6.0 L/100km CS-only
    \r\n35.1L burned | 1.5L EMM, 22.6L wasted (16.6 ERDTT, 6 dealer)
    \r\nYear 2: 9277 km | 92.5% EV | 5.0 L/100km CS-only
    \r\n29.6L burned | 0.5L EMM
    \r\nCombined EV%: 95%
    \r\n
    \r\n-Triple-honk when exiting the vehicle (purposefully left on) - possible workaround Hidden Content
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    \r\nExtremely cold and can only use engine?
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    \r\n Quote Originally Posted by Fourdoor\r\n View Post\r\n
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    Good luck finding a tuner who knows Volt code that hasn\'t left this forum in disgust due to the bad attitude of the many "enlightened" volt owners here.
    \n
    \nKeith
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    \nPlease point me to the thread on this board of anyone who claims to have changed any code except table values in a Voltec system.
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    \nI don\'t say it can\'t be done - any code created in 2010 can be hacked in 2017 - I just say that no one has done it.
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    \nAs for externally charging or discharging the HV battery without the battery management system detecting it, you obviously don\'t believe in redundancy. There would be fault codes in seconds.\r\n
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    \r\n Quote Originally Posted by mikeg3\r\n View Post\r\n
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    Please point me to the thread on this board of anyone who claims to have changed any code except table values in a Voltec system.
    \n
    \nI don\'t say it can\'t be done - any code created in 2010 can be hacked in 2017 - I just say that no one has done it.
    \n
    \nAs for externally charging or discharging the HV battery without the battery management system detecting it, you obviously don\'t believe in redundancy. There would be fault codes in seconds.
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    \nTo the modders that just sounds negative.
    \n
    \nSo my response is: "Great! Go for it. Please post pictures and the step-by-steps for adding the 6.6kW charging to your Volt." There are many who would be interested in doing the same. When does this Volt 6.6 project start?\r\n
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    2011 Cyber Gray, Std Wheels, Black Leather/White Console, Bose, Nav, Htd Seats, Park Assist. Picked up May 2011
    \nB3320
    \nBest All Electric Miles: 54.2
    \nLifetime: 84,576 miles, 135 MPG, Remaining Oil Life 74%
    \nTypical Commute: 60 miles
    \n30 day Stats: 1366 miles, 125
    MPG, 65% Electric, 33% gas, Saved 48 gal., 27 kW-hr/100 miles
    \nHidden Content Free Volt Manual here: Hidden Content
    \n
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    1. #1
      Join Date
      Feb 2015
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      Ephraim, UT
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      Default Adding a second OEM charger for 6.6kW charging - CANBUS hacking

      Howdy,
      I am interested in adding a second OEM charger to a first-generation Volt to double the charging power from 3.3kW to 6.6kW. This is theoretically possible, according to work by EV developer mauswerkz, by creating a separate CANBUS network for the second charger. The CANBUS module would need to send info to the second charger based on what the car is telling the first charger to do.

      Of course, there would be HVDC and AC wiring work to do: possible replacement of the J1772 inlet and AC wiring with higher-current-capacity hardware, and duplicate or replacement wiring for the HVDC charger output. Also, it'd be necessary to sniff the J1772 communication to see if there is adequate current from the EVSE to drive the second charger at full or partial power, or at all.

      I could see this being pretty useful for me and others that want to minimize gas use during trips that go beyond EV range. I tend to stay close to my rural home most of the time, but regularly take longer errand-running trips that would benefit from higher-power opportunity charging. It's not necessary or beneficial for most, but it would be a nice option for some.

      Does anyone know of any existing work on adding a second charger, OEM or otherwise?

      Here are some more links from mauswerkz' project, which uses a number of Volt parts:
      https://hackaday.io/project/4649/logs/sort/newest
      http://www.diyelectriccar.com/forums...er-133857.html
      http://forums.evtv.me/?forum=403618
      http://gm-volt.com/forum/archive/index.php/t-12958.html
      https://hackaday.io/project/4649/log...he-small-stuff
      https://hackaday.io/project/4649/log...-front-battery
      https://hackaday.io/project/4649/log...ing-components

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