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TickTock
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Re: Had the P3227 reprogram done today: interesting results.

Wed Aug 28, 2013 7:59 pm

jhm614 wrote:
TickTock wrote:Thanks for the graph - good stuff! My experience is a little different, though. For me, my gids and Ah both increased after the sw update (on 7/10) but I am seeing no perceivable increase in range or 0-100 charge from the wall. In the graph below, I plot the power from the wall to go from 5 gids to 100% charge (extrapolating to 5 gids - typically I start from ~40) along with gids*.08 using the left axis along with Ah and my range (actual+remaining indicated on GOM) on the right axis. Vertical cyan line indicates when the sw update was performed.
How far does your data go back? Any chance you could plot just the Ah out over a much longer period?
I have been logging data since Sept'11 here but didn't know how to read Ah until GregH solved that puzzle in June of this year. However, I did find one log file from Mar'12 where I was experimenting with the 79b messages (but not understanding the results) from which I was able to extract an Ah reading (single orange dot in the upper left corner). So here's a graph with all the Ah data I have (along with kWh from the wall and according to gids). The discontinuity in Aug'12 was from the first time my battery capacity bars were reset by the dealer prior to shipping it along with six others to the Stanfield testing facility.
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TickTock
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Re: Had the P3227 reprogram done today: interesting results.

Sun Sep 08, 2013 7:44 am

TickTock wrote:
edatoakrun wrote: What do you believe your own pre and post update charge records show about accuracy?

https://docs.google.com/spreadsheet/ccc ... li=1#gid=1" onclick="window.open(this.href);return false;
I been waiting for more data to make a call, but since that is months away I will go ahead and make some wild extrapolations based on the 2 weeks of data I have so far :-).
If you click on the graphs tab in the link you provided, you can see the graph below. but I will include a jpg, too. I have seen my gids (blue dots) increase since the update on 7/10, but no apparent increase in capacity as measured from the wall (green dots). Furthermore, if you squint and look at it sideways after having a couple of shots, you may conclude that the variation in the wall power *has* gotten more stable/consistent since 7/10. Time will tell... Be interesting if the large gid temperature variation I show also reduces.
I recently posted on a different thread contradicting my speculation here on the lack of increased range. Now that I have more data I think it tells a different story.


Here is my up-to-date capacity chart. I annotated the sw update on 7/10/2013 where you can see a clear increase in gids (blue) and a slight increase in wall power (green). I think my data does show that capacity (green) did increase slightly for me after the sw update although it took a week or two. Also, I am now seeing more volatility in the gids than I saw before the update.

Image

tivollix
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Re: Had the P3227 reprogram done today: interesting results.

Wed Sep 18, 2013 5:56 am

Hello,
Here is my data after my P3227 update. Leaf with low milage in mostly cold climate (Montreal, QC, Canada)
Update was done on August 14th, you can see the capacity spike, jumping from 91 to 94%

Image

The gauge seems to have been overly optimistic before the update. My capacity has not stabalized 1 month after the update.

All the data here:
https://docs.google.com/file/d/0B1YaJGo ... sp=sharing

Now the weather is cold again, close to freezing some nights and the capacity continues to drop. Went from 95,5% CAP to 86% in 3 month.

Does anyone have seen such a drop?
Thanks!
Last edited by tivollix on Wed Sep 18, 2013 5:27 pm, edited 2 times in total.
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DaveEV
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Re: Had the P3227 reprogram done today: interesting results.

Wed Sep 18, 2013 9:39 am

tivollix wrote:Does anyone have seen such a drop?Thanks!
I will plot mine again, but it was been steadily decreasing and not showing any signs of leveling out. I guess I shouldn't expect that since batteries only lose capacity, not gain capacity, but I would surely would expect capacity to level out in cool weather in your case. For me, it's cooled off a bit the last couple days, but still "warm".

For your car, it looks like you bought it used?

57Ah for 9,000 miles in Canada seems pretty low, even if the car is around 2 years old based on your VIN. I'd say that the BMS is still learning the capacity of the pack...

The last week I've tried using the Blink timer to avoid charging all the way up to 80% since I typically use about 30% SOC each day - I time it to get around 65-70%, then car sits all day around 50-55% and then sits at home around 40% until the timer goes off. I doubt it will make a significant difference at this point in the game, but isn't hard to do and a 10% reduction in average SOC in theory should be good. Anyone else notice that Ah seems to dip when SOC is lower and then bounces back up after getting charged?

Here's the latest chart of Ah on my car.
Image

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tivollix
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Re: Had the P3227 reprogram done today: interesting results.

Wed Sep 18, 2013 12:28 pm

Hello,
Thank you very much for your graph. It gives me hope to reach the plateau soon.

The capacity of the car was inline with aging model, I was expecting 8 to 9% degradation of the battery given the car usage and age.
The displayed capacity was above 94% before summer heat. After the hottest july days it dropped to 91%, this was perfectly matching the aging model. Then the P32237 update accelarted the drop. So it seems that the previous software was way too optimistic.

My usage is the same than yours. 80% every week days. With charge finishing just before use (6am). Then the car sits with 55% charge for 9 hours and spend the night at 30% it probably starts charging at 3:30 am. The car is never stored charged above 45%. Temperature was never extreme.

Image

Now I just to have to wait it should plateau soon. I am expecting the plateau since 2 weeks now. I will post an update in a few weeks.
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supra410
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Re: Had the P3227 reprogram done today: interesting results.

Wed Sep 18, 2013 2:33 pm

I lost my first bar Monday with an average 100% ending at 232 gids. I had the reprogram done yesterday and today's 100% yielded 256 gids. Still have 11 bars. Interesting results.

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vrwl
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Re: Had the P3227 reprogram done today: interesting results.

Wed Sep 18, 2013 3:27 pm

supra410 wrote:I lost my first bar Monday with an average 100% ending at 232 gids. I had the reprogram done yesterday and today's 100% yielded 256 gids. Still have 11 bars. Interesting results.
Too bad you didn't get the reprogramming done right before losing that bar. You might have avoided the bar loss for this year. :(
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TomT
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Re: Had the P3227 reprogram done today: interesting results.

Wed Sep 18, 2013 3:53 pm

Though it makes no practical difference since the range is the same either way...
vrwl wrote:Too bad you didn't get the reprogramming done right before losing that bar. You might have avoided the bar loss for this year. :(
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Re: Had the P3227 reprogram done today: interesting results.

Thu Sep 19, 2013 7:40 am

TomT wrote:Though it makes no practical difference since the range is the same either way...
vrwl wrote:Too bad you didn't get the reprogramming done right before losing that bar. You might have avoided the bar loss for this year. :(
True, it doesn't affect range, but the actual bar loss might have been affected. OP would be looking at 12 bars instead of 11. Might have made a difference if OP was planning on selling the car or trading it in this winter.
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WetEV
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Re: Had the P3227 reprogram done today: interesting results.

Thu Sep 19, 2013 9:06 am

tivollix wrote:Then the P32237 update accelarted the drop.
Your experience has changed my attitude from P32237, "so what?" to "I probably need to get this just to see what it does".

Along with wanting to support the battery life model.
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