LeafSpy reports 92% SOC after full charge

[jbanyer]

After an overnight 100% charge, LeafSpy reports a SOC of around 92%, sometimes less. The dash shows 12/12 SOC bars. Is this normal?

My battery is at 9 SOH bars, 70% SOH in LeafSpy.

[Feng]

Mine stops between 95-96%, I think it's not supposed to stop at 100%. Might be taking reserve capacity into account.

Do you know how balanced your pack is and how to balance it?

[jbanyer]

Hi Feng. No, in not sure how to quantify how balanced the pack is or how to improve it. Any tips appreciated!

[stewartm]

I find mine with 9/12 charges, then drops after balancing. You can always replug in after a few minutes wait.
Doing this gives me about 12 more km..

[Feng]

I'm not 100% sure so someone can correct me if I'm wrong. The voltage difference is either on the top right of the battery chart in large writing or on the bottom of the chart in brackets, on the line where it says min/avg/max. Mine is usually around 20-30mV. I don't know what counts as an unbalanced pack. To balance your pack you're supposed to charge to 100% and leave it plugged in for four hours and it'll do it automatically. Ie, just fully charge it overnight and let it sit for a few hours after. That's going by what I read a while ago.

[alison]

Mine has always stopped somewhere between 89-94% SoC

It's at 10 bars, 74-ish SoH.

[pharmadave]

Just a quick question about stats from LeafSpy and what the dash displays.

At the moment, I have 9kms on the GOM but when I plug in the LeafSpy dongle, the %SOC is around 23%

Does that mean my batter is actually 23% charged and I can extract a bit more range out of it?

I think it’s weird that the GOM is down to 1 bar but LeafSpy reckons there’s 23% left in the tank.

I know Nissan does program a buffer (2kwh) from some where I read for emergencies but such a big discrepancy?

Cheer in advance.

[rusdy]

Jul 19, 2019 19:41:56 GMT 11 pharmadave said:

I think it’s weird that the GOM is down to 1 bar but LeafSpy reckons there’s 23% left in the tank.

I know Nissan does program a buffer (2kwh) from some where I read for emergencies but such a big discrepancy?

Welcome to the wonder of LeafSpy! To be honest, now that I've run couple of experiments running on low battery charge, the GOM is surprisingly reliable on lower end, i.e. if the GOM says 9km, you'd better plan your trip as-if you only have 9km left!

If you want to push the car into unknown territory (that the GOM can't tell you), then, 'kWh remaining' figure in LeafSpy is your new best friend! I've been using LeafSpyPro, so not sure whether this screen is the same for you or not:



The figure I highlighted above in red is taken from the Leaf's onboard computer, i.e. GID (Wh = GID * 77.5). My naive understanding so far, this is the most reliable indicator. Anyway, trying not to get too much into technical, in order to get remaining distance, you need to know (accurately), how much energy left (in kWh) in your battery.

The simple reason, is, you know roughly (mostly by experience on your journey) how much kWh/km your prospective consumption. Knowing this figure (i.e. kWh/km), you can predict reliably how much distance you have left, by entering that figure manually in the yellow box I highlighted above.

LeafSpy allows you to do this manually. In the example above, I chose figure 149Wh/km (which is super conservative), then I know I have 9km left until I hit VLBW (after this, the GOM simply blanks out). My dash looks like just like yours when the screenshot above taken (but with 11 ~ 12 according to GOM).

By using the LeafSpyPro like the above, I know that I have at least 13km distance remaining (the GOM is not too far off at the time).

Now, what is really valuable having LeafSpyPro, is when one to venture out to the 5% remaining SOC. But that's another topic, as you want to watch your battery voltages (V Delta above). As soon your Leaf cells go haywire (more than 0.1V differences in cell voltages), you're going to dangerous territory. That is the reason I put 'Delta V' in my custom screen above (I think custom screen only available in LeafSpyPro).

Have fun with LeafSpy!

PS:
SOC uses Ah (Ampere-hour). Unfortunately, Ah is not really the best way to gauge your remaining energy. You deplete Ah quicker at the bottom end.

PPS:
What I've found interesting, when I go really low (below VLBW, sub 2kWh remaining), the 'remaining kWh' figure slows down (although I'm still consuming power as indicated by 'Used kWh'). I still haven't got to the bottom of this, but my guess so far, the GID value in the Leaf's computer trying to re-learn actual remaining kWh in the battery. My guess (pure guess), the GID algorithm is not so accurate with guessing Leaf's dilapidated battery. However, this is another topic, I think I confuse enough people at this stage...

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[pharmadave]

Thanks for the info and interpretation.
I drove the car till the dashed GOM came up.
I charged it up to 100% and ended up with 193 GIDs which means my car's battery has around 15kwh of capacity.

[rusdy]

Jul 23, 2019 11:14:54 GMT 11 pharmadave said:

Thanks for the info and interpretation.
I drove the car till the dashed GOM came up.
I charged it up to 100% and ended up with 193 GIDs which means my car's battery has around 15kwh of capacity.

Still good (compared to mine)! 

Side note, the LBW (Low Battery Warning) and VLBW (Very Low Battery Warning, i.e. double dash on GOM) chimes when it hits GID 49 and 24 respectively (regardless of SoC).

So, as the battery degrades, the 'usable psychological' range (i.e. before LBW chimes) degrades much quicker  . My 'usable psychological' range currently merely 50km  .