If they can charge it to 100% before he leaves with it, and reset the trip meter and energy economy display, that should give you most of what you need.
Note the SoC and reset the trip meter at the start of the trip (leaving the dealership)briscobully said:SageBrush said:Possible ? Surebriscobully said:I'm dying to get to that 2013 SL with the Feb 2013 build date and LeafSpy it! Is it possible that a Feb build with 26k miles realistically showing 12 bars still?
Likely ? I think not
LeafSpy will not clue you in to a reset. Only a decent range test drive* (say, of at least 30 miles) would let you sort out the real battery health.
*
Reset the trip meter for the test drive. This will also show you the consumption rate (in miles/kWh) for the test drive.
kWh = 1/consumption rate * distance traveled
Compare the SoC drop of the test drive to the kWh consumed. A battery in good shape drops less than 5% SoC per kWh
So I may have convinced the sales rep to bring the car to me (long story) is there anything I can have them do that will help me with testing the battery as explained above? He's got about a 20 mile trip to me and don't know if I will have time to do another 30 miles to check it out. Thx
FYI, before you buy any LEAF, make sure you know its history and where it was first sold. I personally would never buy a LEAF that lived out most of its existence in a hot climate - unless it was dirt cheap and very likely to qualify for a free replacement pack.
alozzy said:You can estimate the health of the battery fairly well by doing a short-ish range test:
- Note the current state of charge (SOC) BEFORE you start driving
- Reset the energy economy gauge and trip counter BEFORE you start driving
- Drive on a highway, in good weather, maintaining 50 mph until the state of charge has dropped by 25% from the SOC you noted earlier
- Get off the highway ASAP and note how many miles you drove and the energy economy reading on the dash
With the above information, you can estimate the kWh capacity of the battery:
Step 1 - Calculate kWh consumed by trip:
distance (miles)/efficiency (miles/kWh) = usage (kWH)
Step 2 - Calculate approximate pack capacity:
Since the above is the kWh usage for 25% SOC drop, 100% estimate would be just 4 times that #
For example, if you drove 20 miles over a 25% SOC drop and average 4.5 miles/kWh, then:
20 miles / 4.5 miles/kWh = 4.44 kWh consumed for trip
Then, multiply that number by 4 (i.e. 17.7 kWh) to get the estimated pack capacity in kWh.
Note that none of the above relies on LeafSpy data, which is why it's useful...
A brand new pack is around 21 kWh useable, so LeafSpy SOH should be about 84% in the example. If instead it was >90% then a BMS reset would be a strong possibility.
Having stated all of the above, a BMS reset on a 2013 would be pretty obvious anyways because virtually no 2013s are likely to have an SOH >90% at this point.
However, a used 2015 that was driven in a hot climate and had its BMS unscrupulously reset then exported across states, would be more likely to fool a potential buyer. That's because most 2015s in moderate climates would still have >93% SOH.
That's the purpose of a range test - to weed out BMS reset LEAFs.
FYI, before you buy any LEAF, make sure you know its history and where it was first sold. I personally would never buy a LEAF that lived out most of its existence in a hot climate - unless it was dirt cheap and very likely to qualify for a free replacement pack.
LeftieBiker said:FYI, before you buy any LEAF, make sure you know its history and where it was first sold. I personally would never buy a LEAF that lived out most of its existence in a hot climate - unless it was dirt cheap and very likely to qualify for a free replacement pack.
Or, better still, already had that new pack installed recently.
alozzy said:A brand new pack is around 21 kWh useable, so LeafSpy SOH should be about 84% in the example. If instead it was >90% then a BMS reset would be a strong possibility.
alozzy said:Having stated all of the above, a BMS reset on a 2013 would be pretty obvious anyways because virtually no 2013s are likely to have an SOH >90% at this point.
alozzy said:However, a used 2015 that was driven in a hot climate and had its BMS unscrupulously reset then exported across states, would be more likely to fool a potential buyer. That's because most 2015s in moderate climates would still have >93% SOH.
SageBrush said:Alozzy is right about the SOH in my 2013 LEAF. It is at 89%
I have no idea how it will change in the next couple of months as winter thaws. Presumably somewhere between 85-95% ;-)
No, and I do not understand how that is related to my post.lorenfb said:SageBrush said:Alozzy is right about the SOH in my 2013 LEAF. It is at 89%
I have no idea how it will change in the next couple of months as winter thaws. Presumably somewhere between 85-95% ;-)
Do you believe that a BMS reset can set the SOH to any value, e.g. 85%, other than just 100%?
SageBrush said:lorenfb said:SageBrush said:Alozzy is right about the SOH in my 2013 LEAF. It is at 89%
I have no idea how it will change in the next couple of months as winter thaws. Presumably somewhere between 85-95% ;-)
Do you believe that a BMS reset can set the SOH to any value, e.g. 85%, other than just 100%?
SageBrush said:No, and I do not understand how that is related to my post.
SageBrush said:Regarding the reset, I'm under the impression that the initial read is 100% and then with driving over a few weeks (maybe a couple of months ?) the SOH settles down to the pre-reset value.
SageBrush said:So it is not the SOH value in and of itself (unless it is 100%) that makes a reset suspect, but a SOH value considerably higher than normative for the peer group.
SageBrush said:My car fits the mold of a reset: It arrived with a LeafSpy reading of 64 Ahr and 99.6% SOH, and over 6 months lost 10% of each value. I don't think the car had an intentional reset because the dealer showed me other cars with poorer readings and the current readings are still quite good. All in all, we are treading in very poorly understood waters.
SageBrush said:Alozzy is right about the SOH in my 2013 LEAF. It is at 89%
I have no idea how it will change in the next couple of months as winter thaws. Presumably somewhere between 85-95% ;-)
briscobully said:SageBrush said:Alozzy is right about the SOH in my 2013 LEAF. It is at 89%
I have no idea how it will change in the next couple of months as winter thaws. Presumably somewhere between 85-95% ;-)
What build month is your 2013? As stated, this one I'm looking at is Feb.
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