ILETRIC
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Charging - SOC level differs based on prev. discharge

Thu Jun 23, 2011 7:04 pm

I've noticed this over the course of a few days: I drive 84 miles a day, do some charging at work. I need 54 "official" miles to make my 42 mile journey home - all freeway with crusise on. I noticed that if I discharge the batt to three blinking lines and no miles left with the last bar gone, down to about 4-6 "invisible" miles remaining before the turtle mode, and I charge overnight, in a.m. 100% charge reads 88 miles. If I bring the car back with, say 4 miles and one bar remaining and charge overnight, I get it to mid nineties in a.m. When I go short downhill with the full batt it jumps to over 100 miles. If I got it up to only 88-mile full charge after a deep discharge, it may make it to 90 downhill. It's like I'm missing almost 10 miles from the same overnight charge based on what I did the previous drive home. Weird, is it not?

Nissan, we need bigger batteries! Fast!
------------------------------------------------
1st bar lost at 38,700 miles/22 months
2nd bar lost at 45,750 miles/27 months

Traded-in on 10-19-2014 at 56,150 miles
-------------> for Kia Soul EV+ <-------------

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garygid
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Re: Charging - SOC level differs based on prev. discharge

Thu Jun 23, 2011 8:11 pm

Good observations. Not strange, working as designed.

At 100% charge, the SOC is the same, but the calculated "Miles Remaining" differs, depending upon how gently/aggressively you drove during the (roughly) 5 minutes before you parked the car for charging. Drove very gently it could say 100 miles, drove very aggressively it could say 70 miles, BOTH at the SAME State of Charge (SOC).
See SOC/GID-Meter and CAN-Do Info
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planet4ever
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Re: Charging - SOC level differs based on prev. discharge

Thu Jun 23, 2011 10:05 pm

As Gary says, that number you are referring to is not really mappable to State Of Charge. It is only a computer's guess at how far you can safely go if you continue driving the way you just have been. Because of that, many of us have been calling it the guesstimator, or some slight variation of that made-up word. Like a number of others, I find it best to ignore the number altogether. I do watch the twelve bars which surround it; they are much closer to being a real (albeit very low resolution with a non-zero origin) SOC gauge.

Ray
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TonyWilliams
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Re: Charging - SOC level differs based on prev. discharge

Thu Jun 23, 2011 10:12 pm

Put a smiley face sticker over the Guess-O-Meter and you won't worry about the crazy numbers.

Count the bars to determine range.

JRP3
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Re: Charging - SOC level differs based on prev. discharge

Fri Jun 24, 2011 5:51 am

Has Nissan talked at all about changing to a real 0-100% SOC gauge instead of the 12 mystery bars? Have they fixed the issue with turtle mode only giving about a mile or less of range?

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davewill
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Re: Charging - SOC level differs based on prev. discharge

Fri Jun 24, 2011 9:03 am

JRP3 wrote:...Have they fixed the issue with turtle mode only giving about a mile or less of range?
I would't call that broken. Turtle means "pull over now!" It's the equivalent of an ICE coughing and sputtering because fuel is running out. We already have a "very low batt" warning that means there's only a few miles left.
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JRP3
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Re: Charging - SOC level differs based on prev. discharge

Fri Jun 24, 2011 10:48 am

Since the mileage estimate is less than accurate the low battery warning that tells you there's only a few miles left may not be accurate either, and people have been left stranded because of it. Turtle should come on sooner and allow a few miles of travel in my opinion, coupled with a more accurate SOC gauge listing percentage of charge on a finer scale of 0-100. EV's can travel a long distance at reduced speeds so there is no good reason to go into turtle mode and then be stuck after a few hundred feet.

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Jimmydreams
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Re: Charging - SOC level differs based on prev. discharge

Fri Jun 24, 2011 10:55 am

JRP3 wrote:Since the mileage estimate is less than accurate the low battery warning that tells you there's only a few miles left may not be accurate either, and people have been left stranded because of it. Turtle should come on sooner and allow a few miles of travel in my opinion, coupled with a more accurate SOC gauge listing percentage of charge on a finer scale of 0-100. EV's can travel a long distance at reduced speeds so there is no good reason to go into turtle mode and then be stuck after a few hundred feet.
How many miles should remain once you hit turtle mode is always different depending on one's opinion.

But AFTER the software change, I think it's fairly safe to say that no one will run out of juice without PLENTY of advanced warning. As has been said many times buy many people: ignore the miles remaining number and count the bars remaining. If you exhaust all your bars, hit turtle mode, and still feel like Nissan left you stranded, well, I don't know what to say. ;)
JimmyD
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JRP3
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Re: Charging - SOC level differs based on prev. discharge

Fri Jun 24, 2011 3:08 pm

Not being a LEAF owner I wasn't aware that the software update improved the accuracy of the bar graph. Good to know.

ILETRIC
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Re: Charging - SOC level differs based on prev. discharge

Fri Jun 24, 2011 3:16 pm

Now here is another thing, going back to my original post. Again, this a.m. it showed 84 miles. Fine. I understand it was freeway 65 and over hard (ECO though) driving. This a.m. I drove 10 miles in town at 35 or so I jacked in and topped it off. The "smiley face" smiles at 100% showed -- as expected -- mid-90's. Going down my starting point hill, 101 "smiley" miles.

Now here is the thing. I DROVE TO WORK TODAY THE SAME WAY I ALWAYS DO AND ARRIVED WITH 6 BARS AND 46 SMILEYS, WHILE DAY BEFORE 5 BARS AND 35 SMILEYS. So what I'm concluding here is the following: Deep discharge prevents the batt from accepting a truly full charge. And topping it off after a minor discharge does the trick. It's as if I need to do some minor driving and topping off before my 42 mile freeway commute, than just charge overnight and do the 42 miles, because I start with less SOC than with the former. I'm thinking of it as having pissed the batt off by deep (almost turtle) discharge and it's making it not properly recover from the event. And the smiley miles 84 vs. 101 attest to that at least on the face (pun not intended) value.
------------------------------------------------
1st bar lost at 38,700 miles/22 months
2nd bar lost at 45,750 miles/27 months

Traded-in on 10-19-2014 at 56,150 miles
-------------> for Kia Soul EV+ <-------------

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