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TonyWilliams
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University Study needs Data Logging of kWh consumed

Tue Oct 23, 2012 11:22 am

How can this be done with existing technology, or is something new needed?

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surfingslovak
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Re: University Study needs Data Logging of kWh consumed

Tue Oct 23, 2012 11:28 am

TonyWilliams wrote:How can this be done with existing technology, or is something new needed?
Consumed from the wall or pulled from the battery?

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TonyWilliams
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Re: University Study needs Data Logging of kWh consumed

Tue Oct 23, 2012 12:19 pm

From the battery while driving.

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surfingslovak
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Re: University Study needs Data Logging of kWh consumed

Tue Oct 23, 2012 12:29 pm

Ok, don't laugh, but could they use CarWings data? Mine was inaccurate until the very end, but perhaps it's better with the new cars?
Image

Other than that, if you didn't want to use a CAN bus logger, I suppose you could install your own hall sensor on one of the high voltage wires coming out of the battery pack to measure current. Not sure where to plug in to measure pack voltage, but that I'm sure that a suitable place could be found. Where is Phil when you need him? :D

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TickTock
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Re: University Study needs Data Logging of kWh consumed

Tue Oct 23, 2012 12:32 pm

The way I've been doing it is monitoring the pack_volts, and pack_amps can messages and computing energy as integral over time of V*I*delta_time. It an be done either with a netbook connected to a gid-o-meter or in the meter itself with a simple change to the firmware.

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TonyWilliams
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Re: University Study needs Data Logging of kWh consumed

Tue Oct 23, 2012 12:33 pm

I doubt Nissan would permit active CarWings monitoring, but I guess the researchers could get the info from the drivers.

grommet
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Re: University Study needs Data Logging of kWh consumed

Tue Oct 23, 2012 12:42 pm

Unless you have an early LEAF with the bad telematics firmware (and haven't updated it), kWh reporting via CARWINGS is accurate enough.

The web site allows you to download the usage records in monthly chunks. These can be given to a researcher.

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surfingslovak
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Re: University Study needs Data Logging of kWh consumed

Tue Oct 23, 2012 12:43 pm

TonyWilliams wrote:I doubt Nissan would permit active CarWings monitoring, but I guess the researchers could get the info from the drivers.
Yes, exactly. And if they wanted something more scientific, they could go the CAN bus route TickTock described above.

On a related note, I was hoping that Leaf owners could get a site similar to voltstats.net going, but now that GM decided to block access to their wireless data, the chances it will be done for the Leaf are slim. Presumably, you would share your CarWings login credentials with an independent website in this scenario, and they would communicate with the backend, collect raw data, and present it in a different way. They had lots of neat stats for the Volt, it was a really valuable resource.

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evnow
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Re: University Study needs Data Logging of kWh consumed

Tue Oct 23, 2012 1:25 pm

# of miles driven / (m/kWh) gives you kWh used. Carwings with newer firmware gives good data.

I've data for last 19 months, I can share.
1st Leaf : 2/28/2011 to 5/6/2013
2nd Leaf : 5/4/2013 to 3/21/2017
Volt : 3/25/2017 to 5/25/2018
Model 3 : 5/10/2018 to ?

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TonyWilliams
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Re: University Study needs Data Logging of kWh consumed

Tue Oct 23, 2012 1:26 pm

I'm going to direct the researchers here.

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