cwerdna wrote:I wouldn't treat the kWh figures from Leaf Spy as gopsel due to the reasons I already mentioned. I would just go by battery gids.
Hi cwerdna, you meant the kWh figure used? Yea, I agree. This is wildly different from the car's dash. However, I think the GID suffers the same fate (i.e. inaccuracy within +/-1kWh, which is LARGE inaccuracy for my dilapidated 2012 battery). Definitely not a problem for newer leaf.
The reason I'm doubting the GID, is because it's 1kWh off, if compared to energy used (i.e. my first post experiment), i.e.:
- I started with 12.3kWh (as per LeafSpy);
- For the 24km journey, LeafSpy reported 4,691Wh used (which is calculated from the remaining kWh?), or 195.5Wh/km (as per screenshot);
- The dash reported 0.15kWh/km, which translates to 3.6kWh used.
From the experiment above, I was expecting LeafSpy reported 8.7kWh remaining (i.e. leafspy used kWh to match up with the car's dash). Hence, the confusion and the start of this thread
. From what I've observed so far, the figure used by the car's dash (3.6kWh) not passed to LeafSpy?
The return 24km trip (I haven't posted the screenshot), had the opposite problem. LeafSpy reported 77Wh/km, where as the dash reported 0.12kWh/km. I have a gut feeling the dash has more accurate used kWh figure compared to LeafSpy (as my journey is relatively flat).
My guess, LeafSpy uses calculated value from GID to get used kWh, i.e. the 4,691Wh figure from my screenshot. Where as the dash use volts * amps * time? It's a guess from me. I am aware the clamp current meter used by Leaf is not a precise measurement device either.
Looks like the GID has difficulty in predicting the remaining kWh in my battery due to age (it's quite accurate at fully charge and under VLBW though...). Note that my battery SOH is 69% with HX 47%. Dilapidated indeed:
I'm not sure why fraction of GIDs remaining rather than SoC is used. My guess would be to not include the brick reserve.
Agreeing with you. It's also more practical to have energy unit remaining.