Device Detection Major Update: Chevy Electric Vehicles - 10/11/18

Similar here…

I charge my Bolt most every day (ChargePoint Charger with WIFI and Network Identification enabled), and it still has yet to be detected by Sense.

We have had the Bolt since June 2018.

Hey Ryan, you can probably add the Cadillac ELR to this list. My ELR (same Voltec system as the Chevy Volt) has been seen for the last few months and pretty solidly for the month of December.

Thanks.

Interesting…we haven’t done specific work on that one but it may just look really similar to the Volt and that’s why it’s getting picked up. Thanks for the heads up. We’ll dig in a bit further.

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The ELR is basically a Volt in Caddy clothing, so it makes sense it would be detected using a Volt profile.

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Thanks for the heads up. I did not know they were so similar.

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Has anyone had detection success with a Volt being charged at 240V using the standard travel charger, adapted for two phase? Sense has had over two years of this setup and has only managed to detect the Volt’s “battery heating” cycle — a 6 minute ramp up to ~2300W that recurs more often during cold periods. Interestingly this cycle used 140kWh last year.

As a JuiceBox owner, I would just love to see integration between it and Sense. Sense is having a very hard time reliably picking up my Volt. Even when it does see it, it randomly thinks it’s off/disconnected after 20-30 seconds.

I didn’t think it was EVSE specific?

It isn’t - the detection actually happens specific to the charger hardware itself, which is part of the vehicle on all EV’s.

Although recent strides have been made with EV detection there are still some struggles.

@staze, how long ago was your Volt detected initially? If it wasn’t that long ago you may just need to wait a bit longer for your Sense to continue to learn and hopefully detection will get better.

Are you using the Gen2 charger (the Clipper Creek) with a 240V adapter for it? I had one of these initially before moving to a set of Duosida’s.

It shouldn’t effect detection as (like I mentioned in my last reply) it should be EVSE agnostic, with the only requirement being 240V vs 120V.

You could consider deleting the EVSE/heater detection in Sense and seeing if it may aid in it picking up the full car now since detection was updated recently - don’t take my word for it, but perhaps the old detection is somehow blocking the new updated detection.

Alternately, since you’re comfortable with the adapter routine, you could just pickup a TP-Link HS110 and you would instantly gain 100% solid full detection of the entire car. :wink:

As another datapoint, I am using a Bosch (GM OEM) EVSE to charge my 2014 Volt. Sense has found the car but detection is flaky at best. I have another HS110 on the way and am planning to hack something together to get direct measurements.

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Yep, this is the Gen2 charger with a 240V adapter. I’m against using TP-Link simply because this is such a large and obvious usage signature that Sense should be able to accurately spot it. I could go around using current sensing smart plugs on all the major loads, but then that kind of defeats the basic purpose of Sense. So I’m assuming that it will happen soon. I may try deleting the heater (but this is the time of year it runs the most so I may wait a month or two).

I totally see and understand your point, but in my case, having 2 identical EV’s which often charge at the same time, support indicated that I would probably never see a reliable detection because of how the signatures overlap with each other, etc.

Accordingly, because of the reality that every night we are putting ~25KW into our EV’s, I decided it was simpler to just use HS110’s to immediately “solve” the issue and get accurate charging data in Sense moving forward. :wink:

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@oshawapilot : I can’t recall when it first detected. I will say it’s been better the last couple weeks. It seems it almost every time now, regardless of SoC for the car. But, it is still shutting off prematurely (the Sense thinks the car has stopped charging well before it actually has).

So, I think the model is improving, or Sense is doing some work to adjust it. Either way, I’m happy. I would love to see them just integrate with Juicebox like they do for smart plugs, but I’m not sure if that’s doable with how Juicebox’s work. =)

I’m sure they are also looking at direct Tesla integration as well…

Ryan,
Given that this is an old thread, let me add some general suggestions that Sense can use to create some machine learning guidance on EVs.

  • The chargers in all modern (post 2006 cars/trucks) are all power factor corrected, meaning there is a perfectly resistive looking load on the line. It has not inductive or capacitive component to it.

  • All chargers slowly ramp up to full current, whatever that will be, over the period of 5-30 seconds. No clunk, ringing waveforms, overshoot with high current transients. I know your 1 Megasample per second A/D will catch those kinds of things with motors, like older refrigerators etc.

  • The machine learning aspect should realize that after several HOURS of steady consumption, this is not and oven, probably not a hot tub (since the connection is made typically in the evenings after 9-10 PM, when electric power is cheap and plentiful.

  • When the duration parameter is logically AND’ed with a high current level (>25 amps)
    machine learning can conclude it’s an EV. No other load charges for hours without cycling like a heater once reacing setpoint. A hot tub will blast away until a reasonable temperature is reached. Most hot tub are heated with gas not electricity, but there are always outlying exceptions for “solar powered mansions”.

  • Many EVs taper their current draw as the battery fills up. The new Chevy Bolt EV starts that taper at the 50% full point, and slows down the fill rate (reducing the current gradually until the thing is done. Many owners stop their at 80% or some “nearly full” condition. Perhaps Sense employees can connect with Bolt EV owners to characterize things, especially since an EV is the largest single load in the household in most cases.

Training Sense to use these will go a long way to satisfy your growing clientele which are adopting EVs by the thousands. There are happily over 1.2 million plugin cars on US roads today. Not all are plugged in daily, some not at all (like municipally owned Volts, where there is no accountability to do so. There have been Volts for sale that have hardly used the on-board charging equipment at all during their first ownership!

Hope this helps. We, as a community, are looking forward to getting our energy consumption logged and correlated correctly!
Ron

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@freund.ron,
As an owner of 3 EVs, I appreciate your analysis and applaud your inputs. I would be surprised if Sense hasn’t already been running a duration ANDed with high balanced 240A current level to tag those usage regions for the EV data science guys so they have concentrated, tagged data to train on. I think that team is still searching for the elusive early (first minute or two) on-signature, and really can’t use the duration / current criteria as an input feature since is is so time-delayed from the needed detection. And the folks at Tesla don’t make that super easy for Sense since they do tweak EV charging profiles over time with OTA updates.

Good news: We’re rolling out revised Chevy detection models which should help to resolve issues with detected charge ending early, duplicate EV devices, and provide more accurate tracking. Models will be slowly rolling out over the coming days, so you will likely not see immediate improvements. As always, your mileage may vary depending on other factors in your home.

DO you know if this has been implemented yet? My Chevy Volt still doesn’t show up