I want my 281!

My Nissan Leaf Forum

Help Support My Nissan Leaf Forum:

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.

GregH

Well-known member
Joined
Jul 1, 2011
Messages
860
Location
Irvine, CA
SOC#/RAhC/wtf only got to 272 this am after I forced charge following the 80% overnight charge. I know early on I saw as high as 280 and lately it's been 274/275, but 272? This is going in the wrong direction. I see no evidence of cell balancing. This battery is rarely over 80% or under 20%, and while it is warm out, it's mostly sitting in a garage. How many people can now read pack voltage, current and SOC# on their Leaf? And how many of you still see 280/281 on a full charge?
 
The SOC meter has read 77.5% (218 raw) after my last two 80% charges. I am pretty sure a week or so ago, it read 80% and 80.4%.

It has been fairly hot here but the battery temperature still shows 6 segments. My hypothesis, based on my extensive Arts and Humanities background, is that the battery capacity has gone up with the heat and that the raw numbers are not constant. We can correlate this when we have access to finer battery temperature data. Meanwhile, I will be tracking the readings after charging.
 
I've been getting low SOC readings as well since I started using my new meter last week. I can't recall exactly, but I think I've been seeing between 272 and 274. It got my attention, too, since I was able to see 281 with Robert's development rig a few months ago.
 
I charged mine to 100% last night, and when I checked the it this morning, I got SOC = 270, 393.0V.
Mine's even worse! Where's my 281??

I was watching it charge last night, and watched it click over from 79.8% to 80.1%
At 80.1% (225), I had 390.0V

I normally charge to 80% except on Fri/Sat nights, where I charge to 100%.
 
I couldn't help noticing that the reports of relatively sudden drop in battery capacity were clustered geographically. AFAIK it's Southern California and Arizona. I'm wondering if there could be environmental factors at play, especially in the light of this ABC news article mwalsh referenced in another post. Could any of the posters confirm that it's been unusually warm in the past week or so?
 
surfingslovak said:
I couldn't help noticing that the reports of relatively sudden drop in battery capacity were clustered geographically. AFAIK it's Southern California and Arizona. I'm wondering if there could be environmental factors at play, especially in the light of this ABC news article mwalsh referenced in another post. Could any of the posters confirm that it's been unusually warm in the past week or so?

Yes, it's been hot, but nothing like Texas or AZ. Low 90s, maybe, and only for a couple of days.
 
Boomer23 said:
I've been getting low SOC readings as well since I started using my new meter last week. I can't recall exactly, but I think I've been seeing between 272 and 274. It got my attention, too, since I was able to see 281 with Robert's development rig a few months ago.
With my own "development rig" my 100% SOC normally varies between 272 and 280; I've never witnessed 281.
I've also noticed that the range is a bit better these last few weeks. Perhaps the warmer but not hot (< 95F)
conditions.
 
Worst ever this morning:

100% charge beginning at midnight with no stop timer set, charged 5.0 hours, 18.6 kWh
12 bars
SOC #: 257
SOC %: 91.4
Total miles: 4,464
Car's age: about 5.3 months
Daytime temp yesterday, low 90s
 
I've been geting 276. I once got 279.

But my 80% charges have all been 231.

Anyway after 100% charge the SOC meter goes down so fast, it hardly matters whether we get 276 or 281.
 
Sorry, but I have to say that all this strikes me as possibly a bit like trying to measure a rubber band (a CAN-bus number seemingly related to the battery's state of charge) with a micrometer (the SoC meter).
 
Any chance you three with meters (Mike, Boomer, Tony) are
leaving some load turned on?

Even IF the SOC-Meter is left switched to Always-ON, it is not a BIG load.
It could be a 1/4 amp x 12v x 12 hour load (3 amp-hour x 12v) = 36 watt-hour, or only 0.036 kWh overnight.

Or, pre-cooling at 100% might drain the battery a bit.

Or, if even one cell-pair had an unexpectedly high "internal resistance", the 100% charging MIGHT terminate a bit early.

What is the Battery Pack voltage reported by SOC-Meter F1.08?

Perhaps logging a charging session AND several hours after will tell us the story.
 
For the first time in quite a while, I charged to 100 percent the night before since I had a lot of driving to do yesterday. I was presented with 12 bars and the first disappeared at about 6.6 miles (it's downhill from my house) as it always has in the past. So, at 7,000 miles, I see no real difference in battery performance that I can yet detect.
 
TomT,
Yep, Thanks.
Your description would seem to be the normal / good / expected 100% charge and top-Bar usage experience (with noticably less distance than other mid-range Bars).

A very few others appear to be observing a less-full top-Bar.
 
I just went out to read the SOC-Meter after an overnight charge to 100%.

97.1% (273 raw) 393.5 volts

I have previously had over 99%, and normally not less than 98%, but I have been doing a lot of charging to 80%.
 
garygid said:
Any chance you three with meters (Mike, Boomer, Tony) are
leaving some load turned on?

Even IF the SOC-Meter is left switched to Always-ON, it is not a BIG load.
It could be a 1/4 amp x 12v x 12 hour load (3 amp-hour x 12v) = 36 watt-hour, or only 0.036 kWh overnight.

Or, pre-cooling at 100% might drain the battery a bit.

Or, if even one cell-pair had an unexpectedly high "internal resistance", the 100% charging MIGHT terminate a bit early.

What is the Battery Pack voltage reported by SOC-Meter F1.08?

Perhaps logging a charging session AND several hours after will tell us the story.

No loads were left on nor pre-cooling
This morning's readings after a 100% charge, 8.5 kWh, 2 hours 18 minutes of charging:
Bars = 12
SOC # = 274
SOC % = 97.5
Pack volts = 393

I'm thinking that it's an ambient temperature thing.
 
All 80% charges. All using my Blink (except the second one on the 8th). All reading 388.5 Battery pack voltage.

9/6 77.5%/218 raw
9/7 77.5%/218 raw
9/8 77.2%/217 raw
...... 77.5%/218 raw
9/9 78.6%/221 raw

I am very sure a week prior, I was getting 80% or slightly above readings. I think temperature is involved but don't understand why the car would not charge to the same raw number. Doesn't a warmer battery have more capacity (up to a point)? I guess this shows that we don't know what the raw number actually represents.

PS. Should we call the units for the raw number "gids"? :lol:
 
91040 said:
PS. Should we call the units for the raw number "gids"? :lol:
"I will have to get one of these meters so I can see how many gids I am getting on an 80% charge."

Rolls off the tongue very nicely--gets my vote!
 
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?
 
Back
Top