GM Volt Forum banner

1 - 20 of 21 Posts

·
Registered
Joined
·
66 Posts
Is there a way to pull the amount of power the car accepted during a charging session? I cant find anywhere to even see the actual number let alone extract as a data file. I can get some info from my home charger but i'd like it from the cars point of view.
 

·
Registered
Joined
·
430 Posts
You can get the kWh used on the Energy Info Screen for Gen 1 Volts. I believe the Gen 2 Volts have something similar. While this may not be exactly what you're looking for, the total kWh can be used as the approximate number for how much power is needed to charge your car when you start out at a full charge and end at zero miles of EV range left.
 

·
Registered
Joined
·
66 Posts
Discussion Starter #3
You can get the kWh used on the Energy Info Screen for Gen 1 Volts. I believe the Gen 2 Volts have something similar. While this may not be exactly what you're looking for, the total kWh can be used as the approximate number for how much power is needed to charge your car when you start out at a full charge and end at zero miles of EV range left.
Thanks. There is a similar usage screen on the bolt but i'm really looking for a more accurate downloadable version of kwh's accepted in a charging session.
 

·
Registered
Joined
·
430 Posts
Thanks. There is a similar usage screen on the bolt but i'm really looking for a more accurate downloadable version of kwh's accepted in a charging session.
This third party solution may help: https://sense.com. As far as a feature built into the car, I am not aware of one.

Just so you know, the Gen 1 Volt has a 16 kWh - 17.1 kWh battery, depending on the year as they improved them through 2015. The Gen 2 Volt has an 18.4 kWh battery. Because of the protective battery buffer Chevrolet built in (a very good thing), people frequently see 0 EV miles to full charging usage in the area of 10 kWh for the Gen 1 Volt and I think close to 11 kWh for the Gen 2 Volt.
 

·
Registered
Joined
·
66 Posts
Discussion Starter #5
This third party solution may help: https://sense.com. As far as a feature built into the car, I am not aware of one.
My ESVE does this already. I also want to know about the ESVE's I use on the road and also what my car received vs what the ESVE said it delivered.

I had a poke around in the GM API's (https://developer.gm.com/documentation) and there's no obvious one do retrieve this data. Will continue to investigate.
 

·
Registered
Joined
·
3,452 Posts
You can get the kWh used on the Energy Info Screen for Gen 1 Volts. I believe the Gen 2 Volts have something similar. While this may not be exactly what you're looking for, the total kWh can be used as the approximate number for how much power is needed to charge your car when you start out at a full charge and end at zero miles of EV range left.
on the Gen 1 volt the power needed (from the wall) to charge the volt is approximately 1.35 x the reported power consumed out of the previous charge. That is, if you volt was full, and you info display reports that you have used 6 KWH to drive, it will take 8.1 KWh from the wall to fully recharge your volt. This number is at 120 volts, at 240, the number is a bit lower, but not by much (1.25-1.3).

Paul
 

·
Registered
Joined
·
113 Posts
Power used during the last charge is available from the OBD port.

This information, Last charge AC Wh, is available, at least on gen 1. But its through the OBD port.

Bluetooth OBD readers are cheap ($10 to $30), and software fore for android or iOS is free to only a few dollars.

Here's a list of common pieces of data available through these tools, which are called PIDs, that have been shared by resourceful people:
VOLT PIDs

I use Engine Link for iOS and a Bluetooth 4 OBD adaptor. Not quite as nice as Torque, but works on my iOS phone.

-Lumos,

2014 gen 1
 

·
Registered
Joined
·
1,536 Posts
If you have an OnStar account, even the free Basic Plan, charging details are available for download on the myvolt.com website, although the service is sometimes spotty. I can also access my home charging statistics via an internet connection to my Blink L2 charger.

The csv charging details file from the myvolt site is a table listing "Charge Start" (date and time), "Charge End", "Total Charge Time", "Charge Result" (full or partial), and "kW-hr" (two decimal places).
 

·
Registered
Joined
·
3,352 Posts
on the Gen 1 volt the power needed (from the wall) to charge the volt is approximately 1.35 x the reported power consumed out of the previous charge. That is, if you volt was full, and you info display reports that you have used 6 KWH to drive, it will take 8.1 KWh from the wall to fully recharge your volt. This number is at 120 volts, at 240, the number is a bit lower, but not by much (1.25-1.3).

Paul
Comparing the monthly report from OnStar with the daily data I keep on a spreadsheet, I came up with a correction factor of 1.148. Someone verified his charging losses with the data from his third party EVSE and found that my approximation was very accurate. My point is that the charging loss factor appears to be closer to 1.15 than 1.35. This applies to Gen1. I'm unsure if the charging system in Gen2 was made more efficient.
 

·
Registered
Joined
·
53 Posts
Comparing the monthly report from OnStar with the daily data I keep on a spreadsheet, I came up with a correction factor of 1.148. Someone verified his charging losses with the data from his third party EVSE and found that my approximation was very accurate. My point is that the charging loss factor appears to be closer to 1.15 than 1.35. This applies to Gen1. I'm unsure if the charging system in Gen2 was made more efficient.
It may be helpful to consider the physics of vehicle energy use when charging. The car is charging with some efficiency (say, 90% or a factor of 0.9) and it is also using power to run the battery thermal management system. The amount of power needed by the BTMS is likely a function of the charging power. These 2 terms combine to give a total charge efficiency that is a function of the power your EVSE provides. A low power (L1) EVSE will likely have lower overall efficiency because the BTMS will consume a higher fraction of the toal power (even if its absolute power draw is constant).
 

·
Registered
Joined
·
159 Posts
How much charge did the car accept?

A low power (L1) EVSE will likely have lower overall efficiency because the BTMS will consume a higher fraction of the toal power (even if its absolute power draw is constant).
Sounds good but at L1 the power to the battery will be much lower requiring less BTMS cooling, thus balance things out some.

@jbakerjonathan I was wondering if that Gen 1 factor of 1.15 was for L1 or L2?
 

·
Registered
Joined
·
66 Posts
Discussion Starter #12
If you have an OnStar account, even the free Basic Plan, charging details are available for download on the myvolt.com website, although the service is sometimes spotty. I can also access my home charging statistics via an internet connection to my Blink L2 charger.

The csv charging details file from the myvolt site is a table listing "Charge Start" (date and time), "Charge End", "Total Charge Time", "Charge Result" (full or partial), and "kW-hr" (two decimal places).
That sounds perfect but the myvolt website either doesnt work for the bolt or is broken at the moment. Has anyone confirmed this works with the bolt?
 

·
Registered
Joined
·
1,536 Posts
Sorry, I finally noticed this thread was posted in the Chevy Bolt section of this forum, so I suspect you likely couldn’t download charging data from a myvolt.com website. I don’t think there is yet a similar mybolt.com site. There IS a mychevrolet.com website that offers access to similar OnStar supplied data, as well as owner manuals, maintenance records, etc. I can’t say if downloadable charging data is normally available on the mychevrolet.com site, because I just tried my account, and it couldn’t connect to my 2012 Volt (message: refresh your browser or try later...). I would expect Bolt owners to be equally supported on a mychevrolet website sooner or later...
 

·
Registered
Joined
·
66 Posts
Discussion Starter #14
Sorry, I finally noticed this thread was posted in the Chevy Bolt section of this forum, so I suspect you likely couldn’t download charging data from a myvolt.com website. I don’t think there is yet a similar mybolt.com site. There IS a mychevrolet.com website that offers access to similar OnStar supplied data, as well as owner manuals, maintenance records, etc. I can’t say if downloadable charging data is normally available on the mychevrolet.com site, because I just tried my account, and it couldn’t connect to my 2012 Volt (message: refresh your browser or try later...). I would expect Bolt owners to be equally supported on a mychevrolet website sooner or later...
Unfortunately, unless it's just well hidden, the charging data isn't in the mychevrolet site yet.
 

·
Registered
Joined
·
3,945 Posts
That sounds perfect but the myvolt website either doesnt work for the bolt or is broken at the moment. Has anyone confirmed this works with the bolt?
*grin* It'll be hard to tell. As far as I know "Broken and/or unable to contact the vehicle" is the normal state of the mychevrolet site. It works about 15% of the time for me when the car is in the surface lot. (And essentially NEVER if the car's in its basement slot sipping on the charger...)
 

·
Registered
Joined
·
3,352 Posts
Sounds good but at L1 the power to the battery will be much lower requiring less BTMS cooling, thus balance things out some.

@jbakerjonathan I was wondering if that Gen 1 factor of 1.15 was for L1 or L2?
I should have mentioned that I charge L1 @ 12 amp setting.

I realize that my fudge factor is going to vary with BTMS, winter, summer. Without an accurate way to measure, I came up with an approximation that gave me some semblance of what my real energy costs are for my Volt. It's too bad that I can't rely on OnStar reports as they have been historically sporadic. Hummm, it seems that in the recent past, they have been coming every month. Perhaps there is stronger cell phone signal inside my garage. OnStar is using AT&T now, am I right?
 

·
Registered
Joined
·
237 Posts
on the Gen 1 volt the power needed (from the wall) to charge the volt is approximately 1.35 x the reported power consumed out of the previous charge. That is, if you volt was full, and you info display reports that you have used 6 KWH to drive, it will take 8.1 KWh from the wall to fully recharge your volt. This number is at 120 volts, at 240, the number is a bit lower, but not by much (1.25-1.3).
Paul
Your number is correct as far as charging losses at 120V. However, the charging losses are much lower at 240V, I believe closer to 10-15%. I have been charging my 2015 Gen1 Volt with a Voltec L2 at 15A which is not networked, so I can't get an exact number from it.

I do however have a Rainforest eagle that shows the house power consumption in real-time.
https://rainforestautomation.com/rfa-z109-eagle/
This works with my home's SmartMeter over Zigbee, so it includes all charging losses up to the house meter.

I could get the exact consumption data that way in terms of additional kW when the charge starts and drops off, and then compare it with the data from Onstar/car. I will do the same with our new Bolt as well. But I'm waiting for the 14-50 outlet to be installed this weekend to plug in the Juicebox Pro 40A smart which will charge it at 32A instead.
 

·
Registered
Joined
·
237 Posts
*grin* It'll be hard to tell. As far as I know "Broken and/or unable to contact the vehicle" is the normal state of the mychevrolet site. It works about 15% of the time for me when the car is in the surface lot. (And essentially NEVER if the car's in its basement slot sipping on the charger...)
I just logged in to myChevrolet. For Electric economy on my Gen1 Volt 2015, it shows :
32 kWh/100 miles lifetime
953 kWh/100 miles for the last 30 days . LOL

And then for "electricity used", it shows :
89 kWh/100 miles lifetime
182 kWh/100 miles for last 30 days.

I think only the 1st of those 4 numbers make sense.
1) Given that the unit is kWh/100 miles for both lines, I don't know why they are 2 separate lines - both lines should be the same
2) 953 kWh/100 miles is impossible. I don't think 182 kWh/100 miles or even 89 kWh/100 miles make sense either.

I really wish Chevrolet had better telematics. This sucks compared to the Leaf.

For the Bolt, here is what it's showing :

Electric economy :
61 kWh/100 miles lifetime
3 kWh/100 miles for the last 30 days . LOL

And then for "electricity used", it shows :
239 kWh/100 miles lifetime
11 kWh/100 miles for last 30 days.

In this case, I don't think any of the 4 numbers make sense. Total mileage on the car is only 172 at this time.
 

·
Registered
Joined
·
237 Posts
Sorry, I finally noticed this thread was posted in the Chevy Bolt section of this forum, so I suspect you likely couldn’t download charging data from a myvolt.com website. I don’t think there is yet a similar mybolt.com site. There IS a mychevrolet.com website that offers access to similar OnStar supplied data, as well as owner manuals, maintenance records, etc. I can’t say if downloadable charging data is normally available on the mychevrolet.com site, because I just tried my account, and it couldn’t connect to my 2012 Volt (message: refresh your browser or try later...). I would expect Bolt owners to be equally supported on a mychevrolet website sooner or later...
Looks like myvolt.com has more info than my.chevrolet.com indeed. But the Bolt does not show on myvolt.com .
The data on my.chevrolet.com seems to be fairly bogus, whereas the data on myvolt.com seems more reliable.

One odd issue I have with myvolt.com with my Gen1 Volt (2015) is that it has never shown the lifetime miles/kWh on the main login page. It has been at -- since day 1. Does anyone else have this issue ?

The charging history shown in myvolt.com rounds up to the next kWh, which makes it less than useful, IMO.
However, when you download the CSV, you do get fractional kWh.

Another problem is how the CSV from myvolt.com is formatted for the dates, times and duration. They are in string format, and need to be converted. And of course, there is no CSV at all for the Bolt yet.
 

·
Registered
Joined
·
2,774 Posts
One odd issue I have with myvolt.com with my Gen1 Volt (2015) is that it has never shown the lifetime miles/kWh on the main login page. It has been at -- since day 1. Does anyone else have this issue ?
Mine has been the same for 4+ years. Maybe they should hire somebody that can do web construction.
 
1 - 20 of 21 Posts
Top