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garygid
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SOC-Meter Improvement Suggestions

Wed Sep 07, 2011 2:01 pm

SOC-Meter Improvement Suggestions Summary:

1. ...
See SOC/GID-Meter and CAN-Do Info
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DougMarker
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Re: SOC-Meter Improvement Suggestions

Thu Sep 08, 2011 7:26 pm

1. Instead of a box make the SOC percentage replace the useless miles remaining guess on the dash.

TEG
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Re: SOC-Meter Improvement Suggestions

Thu Sep 08, 2011 7:39 pm

DougMarker wrote:1. Instead of a box make the SOC percentage replace the useless miles remaining guess on the dash.
I think that is much easier said that done. You might have to rewrite firmware inside some different dashboard controller.
Probably magnitudes more effort for such a thing.

TEG
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Re: SOC-Meter Improvement Suggestions

Thu Sep 08, 2011 7:40 pm

Related other thread:
http://www.mynissanleaf.com/viewtopic.php?f=44&t=5113" onclick="window.open(this.href);return false;

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aqn
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Re: SOC-Meter Improvement Suggestions

Thu Sep 08, 2011 7:47 pm

garygid wrote:SOC-Meter Improvement Suggestions Summary:

1. ...
Allow manual input of a "miles per XXX" figure; combine it with the current "SoC" figure to optionally display "remaining miles". It'd be up to the user to acquire her own "miles per XXX" figure: by guesswork, or by using historical data, by using the car's "miles per kWh" figure(s), etc.
Anna Nguyen

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garygid
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Re: SOC-Meter Improvement Suggestions

Fri Sep 09, 2011 7:24 am

Before that simple "calculator" (one multiply) function would be meaningful,
a MUCH BETTER indication of the remaining usable energy is needed.

You put in 4.3 mi/kWh, and the "guesSOC" value is 10% (28 raw).
Does that dependably mean that there is 2.1 kWh usable energy left?
NO! :( :( :(

So, doing the multiply of 2.1 x 4.3 = 9.03 ...
or even just mental math of 2 x 4 = 8-something ...
can be VERY misleading if only 1.2 usable kWh remains!!!
See SOC/GID-Meter and CAN-Do Info
2010 Prius
2011 LEAF, 2014 Tesla S85
2018 & 2019 Tesla Model 3
PU: SDG&E
Solar PV: 33 x 225W -> 7 kW max AC
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aqn
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Re: SOC-Meter Improvement Suggestions

Fri Sep 09, 2011 8:34 am

garygid wrote:Before that simple "calculator" (one multiply) function would be meaningful,
a MUCH BETTER indication of the remaining usable energy is needed.

You put in 4.3 mi/kWh, and the "guesSOC" value is 10% (28 raw).
Does that dependably mean that there is 2.1 kWh usable energy left?
NO! :( :( :(

So, doing the multiply of 2.1 x 4.3 = 9.03 ...
or even just mental math of 2 x 4 = 8-something ...
can be VERY misleading if only 1.2 usable kWh remains!!!
You're quite right.

What I tried to get at (but failed, obviously) is this: IF the user has enough historical data to derive a reliable "average miles per 'tankful'" ("miles possible between 12 bars and turtle") average, and the "SoC number" of 281 - 0 does correspond to "12 bars - turtle", then by allowing the user to enter the "average miles per 'tankful'" (not "miles per kWh" as I originally suggested), we can display the remaining miles, which is very useful and is vastly more accurate than the Guess-O-Meter number.
Anna Nguyen

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garygid
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Re: SOC-Meter Improvement Suggestions

Fri Sep 09, 2011 2:33 pm

No, it appears that the "SOC" number is not linear, or even dependable, especially at the low end.

So, such a "miles remaining" calculation would also be undependable, in my opinion.
See SOC/GID-Meter and CAN-Do Info
2010 Prius
2011 LEAF, 2014 Tesla S85
2018 & 2019 Tesla Model 3
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aqn
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Re: SOC-Meter Improvement Suggestions

Fri Sep 09, 2011 9:50 pm

garygid wrote:No, it appears that the "SOC" number is not linear, or even dependable, especially at the low end.
But I keep seeing people posting the CAN bus SoC number along with a percentage. Does the percentage number also come off of the CAN bus or is it calculated as a percentage of 281 (in which case it's not very useful since the number is not linear)? (Sorry if this has been discussed already; I have not been following the "SoC meter" threads very closely.)
Anna Nguyen

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Re: SOC-Meter Improvement Suggestions

Fri Sep 09, 2011 9:58 pm

The raw number comes from the EV-CAN bus. The percentage is derived from assigning the raw number 281 as 100% SOC.
1st Capacity Bar loss 30k mi 16mo
2nd- 49k mi 25.5mo 51.5Ah
3rd- 73k mi 36.5mo 46.9Ah
4th- 86.5k mi 43mo 42.6Ah
5th- 101k mi 50.5mo 38.4Ah, end 36.1Ah
New Battery 9/28/15 104k mi 66.1Ah
1st- 160.5k mi 34mo 54Ah
2nd- 184.4k mi 53mo 49Ah

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