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Re: I want my 281!

Posted: Fri Sep 09, 2011 2:32 pm
by Stoaty
garygid wrote:Stoaty,
Are you coming to the Gathering at HTB in Cerritos tomorrow morning?

At the moment I have 2 SOC-Meter Kits available, which I will bring to the Gathering.

Do you want Red or Blue LED digits?
The Logging Port Option?
Can't make it tomorrow, already have hiking plans. Which color looks better? Which is easier to see?

Re: I want my 281!

Posted: Fri Sep 09, 2011 3:07 pm
by GregH
224# at 80% and 271# at 100% this am..

Re: I want my 281!

Posted: Fri Sep 09, 2011 3:35 pm
by garygid
Looks like we need to find the Battery Temperature(s) in the CAN-Data!

Re: I want my 281!

Posted: Fri Sep 09, 2011 4:13 pm
by surfingslovak
garygid wrote:Looks like we need to find the Battery Temperature(s) in the CAN-Data!
Yes! I was hoping that it was either already possible or was considered a worthwhile enhancement :-)
The battery temperature gauge is very coarse, and if the fine folks from the Chevy Volt universe can be believed, the delta between 70°F (21°C) and 90°F (32°C) can be critical to battery life.

Re: I want my 281!

Posted: Fri Sep 09, 2011 4:21 pm
by Stoaty
surfingslovak wrote:The battery temperature gauge is very coarse, and if the fine folks from the Chevy Volt universe can be believed, the delta between 70°F (21°C) and 90°F (32°C) can be critical to battery life.
Very interesting. Now where was that chart that correlates number of bars on the temperature gauge with actual battery temperature? Edit: found it here: http://www.mynissanleaf.com/viewtopic.p ... 34#p103134" onclick="window.open(this.href);return false; Unfortunately, with the following data:

5 bars - 50.5 degrees F.
6 bars - 75.2
7 bars - 98.2

it doesn't help very much. I run 5 bars (50-75) when at home for a while, and 6 bars when parked in the San Fernando Valley during the day in the summer (75-98). The coarse granularity gives me no useful information about exactly how hot my battery is getting (or how cool at home). This would be high on my list to add to the SOC meter, and the feature that would push me to actually purchase the meter.

Re: I want my 281!

Posted: Fri Sep 09, 2011 4:43 pm
by surfingslovak
Stoaty wrote:Now where was that chart that correlates number of bars on the temperature gauge with actual battery temperature?
Yes, you beat me to it! It's on page 21 in section MWI. It would be nice to have more granular data, and I would be very interested in logging it, preferably over the lifetime of the vehicle.

Image
Click to enlarge

Re: I want my 281!

Posted: Fri Sep 09, 2011 6:55 pm
by TonyWilliams
You could read the actual resistance values directly from the sensors.

Re: I want my 281!

Posted: Fri Sep 09, 2011 7:04 pm
by garygid
Might be difficult to reach the four sensors that are inside the battery pack.

Perhaps it is better to use (if we can find them) the "calibrated" numbers that the LEAF is using internally?

Re: I want my 281!

Posted: Sun Sep 11, 2011 2:00 pm
by 91040
Temperature was more temperate yesterday.

All 80% charges and using my Blink (except as noted).

9/6 77.5%/218 raw -388.5 Battery pack voltage
9/7 77.5%/218 raw -388.5V
9/8 77.2%/217 raw -388.5V
...... 77.5%/218 raw -388.5V (ChargePoint dock)
9/9 78.6%/221 raw -388.5V
9/10 .....95.3%/268 raw ("100%" charge) -393.5V
9/11 80.4%/226 raw -387.5V

It looks like the temperature hypothesis might be correct. What does this tell us about the raw number derivation?

Re: I want my 281!

Posted: Sun Sep 11, 2011 8:23 pm
by evnow
I have always got 231 at 80%. My garage is probably around 65 degrees.