HKSP1413
Posts: 3
Joined: Thu Aug 15, 2019 2:41 pm
Delivery Date: 15 May 1901
Leaf Number: 305185
Location: Seattle,WA

Re: Leaf Spy and Leaf Spy Pro

Thu Aug 15, 2019 2:55 pm

How reliable is SOH or how should I read it?
Image
We recently got a Leaf 2016 SL and decided to adopt Spy Leaf Pro to look at the health of the battery.

Now SOH = 85.70% but I regularly drive for 90/95 miles which to me it much more than 85%. I'll attach the screenshot as soon as I figure it out.

Is SOH not reading the battery well? Or range and SOH are not linearly correlated?

Thank you all!

DougWantsALeaf
Posts: 837
Joined: Fri May 10, 2013 8:21 pm
Delivery Date: 18 May 2013
Leaf Number: 407811
Location: Chicago North Side

Re: Leaf Spy and Leaf Spy Pro

Thu Aug 15, 2019 2:58 pm

What does car show for your efficiency? How many miles per kWh?
2019 SV Plus Silver
2013 Leaf SV
100 Mile Club Member (Number 87)
Max distance on 13 Leaf: 120 miles
Max distance on 19 Leaf: 242 Highway 4.5 miles/kWh (4.9 KWh remaining)

HKSP1413
Posts: 3
Joined: Thu Aug 15, 2019 2:41 pm
Delivery Date: 15 May 1901
Leaf Number: 305185
Location: Seattle,WA

Re: Leaf Spy and Leaf Spy Pro

Thu Aug 15, 2019 7:23 pm

It says 4.4 miles kwh average

DougWantsALeaf
Posts: 837
Joined: Fri May 10, 2013 8:21 pm
Delivery Date: 18 May 2013
Leaf Number: 407811
Location: Chicago North Side

Re: Leaf Spy and Leaf Spy Pro

Thu Aug 15, 2019 7:52 pm

21 kW x .85 = ~18 kW x 4.5 = 81 miles so seems within the realm of possibility.
2019 SV Plus Silver
2013 Leaf SV
100 Mile Club Member (Number 87)
Max distance on 13 Leaf: 120 miles
Max distance on 19 Leaf: 242 Highway 4.5 miles/kWh (4.9 KWh remaining)

cwerdna
Posts: 9574
Joined: Fri Jun 03, 2011 4:31 pm
Delivery Date: 28 Jul 2013
Location: SF Bay Area, CA

Re: Leaf Spy and Leaf Spy Pro

Thu Aug 15, 2019 7:56 pm

DougWantsALeaf wrote:
Thu Aug 15, 2019 7:52 pm
21 kW x .85 = ~18 kW x 4.5 = 81 miles so seems within the realm of possibility.
You talking about kWh?

Where does the 21 come from?
HKSP1413 wrote:
Thu Aug 15, 2019 2:55 pm
How reliable is SOH or how should I read it?
Please see linked posts at https://mynissanleaf.com/viewtopic.php?p=537444#p537444.

'19 Bolt Premier
'13 Leaf SV w/premium package (owned)
'13 Leaf SV w/QC + LED & premium packages (lease over, car returned)

Please don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

goldbrick
Posts: 538
Joined: Tue Aug 01, 2017 3:33 pm
Delivery Date: 01 Aug 2017
Leaf Number: 311806
Location: Boulder, CO

Re: Leaf Spy and Leaf Spy Pro

Thu Aug 15, 2019 9:56 pm

Range and SOH should track fairly linearly. Range depends on a lot of factors, mostly how fast you drive. The same battery will go much farther at 35 mph than at 70 mph. Also, cold temperature, AC use, etc, etc can affect range.

85% SOH isn't great for a 2016 but it is well within the range of 'normal' depending on where the car resides and how it has been treated. Hot temperatures will increase the rate at which SOH drops, as will other factors to a lesser extent.

There is also a 'software update' that applies to the 30 kWh batteries, which I think the 2016 SL used. If that hasn't been done the SOH is less reliable that if it has. At least on my 2017 S (with a 30 kWh battery) the software update increased my indicated SOH by about 5%, which seems to agree better with the range I get from the car.

RustyShackleford
Posts: 95
Joined: Mon Jun 24, 2019 4:59 pm
Delivery Date: 0- 0-2018
Location: central NC

Re: Leaf Spy and Leaf Spy Pro

Fri Aug 16, 2019 11:30 am

How does Leaf Spy determine SOH ? Is it necessary to occasionally charge to 100% so it can see how many GIDs the battery can hold ?
2018 Nissan Leaf SV
2006 Subaru Outback 2.5i Ltd

RustyShackleford
Posts: 95
Joined: Mon Jun 24, 2019 4:59 pm
Delivery Date: 0- 0-2018
Location: central NC

Re: Leaf Spy and Leaf Spy Pro

Fri Aug 16, 2019 11:32 am

Curious about the "miles remaining" number. It seems to be based on a user-entered value for watt-hours per mile. Are we supposed to just estimate that based on looking at the efficiency graphs ? I thought the car's built-in meter actually tweaked the mails-remaining display based on observed driving behavior, which actually seems more accurate. I must be missing something.
2018 Nissan Leaf SV
2006 Subaru Outback 2.5i Ltd

borderless
Posts: 1
Joined: Fri Aug 16, 2019 11:29 am
Delivery Date: 16 Aug 2019

Re: Leaf Spy and Leaf Spy Pro

Fri Aug 16, 2019 11:42 am

I am concerned to expose the obd2 interface wirelessly.
Is it possible to add support for usb obd2 devices? Want to use the OBDlink SX via otg.

goldbrick
Posts: 538
Joined: Tue Aug 01, 2017 3:33 pm
Delivery Date: 01 Aug 2017
Leaf Number: 311806
Location: Boulder, CO

Re: Leaf Spy and Leaf Spy Pro

Fri Aug 16, 2019 1:16 pm

RustyShackleford wrote:
Fri Aug 16, 2019 11:30 am
How does Leaf Spy determine SOH ?
I believe that LeafSpy simply reads the 'SOH' value from the CAN bus and reports it. Also, AFAIK, there is no official Nissan documentation available to the general public that defines exactly what SOH means although the overwhelming evidence supports the conclusion that it is the percentage of original battery capacity left.
RustyShackleford wrote:
Fri Aug 16, 2019 11:30 am
Is it necessary to occasionally charge to 100% so it can see how many GIDs the battery can hold ?
Not really. SOH readings vary day to day and probably depend on temperature among other things. SOH will give a good estimate of the battery capacity and that is probably as good a measurement as you're going to get. If you want to do science experiments then charging to 100% to measure capacity might be more accurate but personally I wouldn't bother since charging to 100% often just increases the risk of extra degradation vs using smaller charging cycles.

There are some reports that say SOH goes up after L3 charging sessions. Whether this is an actual improvement in battery health or just an adjustment in the SOH reading is anyone's guess. My guess is that it's the latter.

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