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JohnT

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  1. JohnT

    Alpha Feedback - Nissan Leaf

    The very early Leafs don't display a battery percentage but that changed around 2013. On my car (2016 24kWh) the percentage display blanks out when you get to very low battery levels so I was extrapolating to say that 0% is also 0 Gids. But the indications are that this is the case.
  2. JohnT

    Alpha Feedback - Nissan Leaf

    Yes, for the 24 and 30 kWh models Gids is universally believed to be a measure of the available energy remaining, in 80Wh units. Low battery warning accours at 49 Gids, Very Low Battery Warning at 19 Gids and the turtle appears at 5 Gids 🙂
  3. JohnT

    Alpha Feedback - Nissan Leaf

    I'm having trouble getting any information on the Live screen on ABRB while driving a route. I'm not sure what I am doing wrong yet but I'm sure it is my error. Possibly something to do with GPS not being active on one or other of the two devices even though I thought it was. I have attached a spreadsheet with some calculations from today's test, along with a photo of Leafspy at the end of the trip (I couldn't remember how to do a screen shot on my old S2 that I use as the second device). ABRB calculated the trip as consuming 3.3 kWh while my actual on basically the same route was around 4.4 kWh. Part of this may be the fact that the aircon was on and consuming around 1kW according to the Leafspy screen shot taken after I stopped. I appreciate that there is a compromise between making the user setup simple and model accuracy but the reference consumption @ 110km/h makes it difficult to judge the effect of fixed loads such as climate control at much slower speeds. That said, I don't think it is a major issue. I can't get my head around the fact that I get very accurate modelling of battery levels in ABRB and yet the plan summary shows quite different km/kWh to what I achieve in practice. There is no way I'd expect 8.3 km/kWh on this trip, even with climate control turned off. It is mixed urban and rural including some significant changes in elevation. If the consumption is being accurately reported then the planned usage points back to a battery capacity of around 17 kWh. The actual capacity is somewhere around 21kWh and I did the planning based on 10% battery degradation in the settings. In summary, I'm very happy that ABRB does a great job but until the plan summary consumption more closely matches reality there is a lingering doubt that it is just coincidental that my trip charge levels match the ABRB plan. abrb1.ods
  4. JohnT

    Alpha Feedback - Nissan Leaf

    Hi Jason, I did some more testing today (24 kWh) and the computed battery % was always slightly over what I saw on the dash. Around 1% at 70% battery level for example, less at lower levels, with my Ahr sitting at 58.45. I'm pretty happy with that but in terms of the equation Gidmax may be more like 283 rather than 281. I don't often charge right up to 100% but next time I do I'll be sure to check immediately with Leafspy and ABRB.
  5. JohnT

    Alpha Feedback - Nissan Leaf

    I had a brief look yesterday Jason. The battery% was about 2% different to the dash. I'll look at the leafspy data over the weekend.
  6. JohnT

    Alpha Feedback - Nissan Leaf

    I confirm that this morning I got the same behavior as Stefan. Same error message in leafspy and no data in live mode.
  7. JohnT

    Alpha Feedback - Nissan Leaf

    I hope for Jason's sake that various models don't do completely different calculations for the battery statistics. I have a 2016 24kWh Leaf ex Japan and I have a lot of data from both Leafspy logs and recorded off the dash. For our car Gids_min is definitely zero but it clearly isn't for your later model. Leafspy SOC is linear with Gids from about 97% down to 10% which I think reflects our battery SOH of around 90%. Dash % is linear with Gids/Gids_max/SOH. When you say "SOC window" do you mean Leafspy SOC or the dash battery %? I think your equation isn't quite right. I'd hazard a guess as it being (Gids-Gids_min)/(Gids_max-Gids_min)/(Ahr/Ahr_max) Cheers John
  8. JohnT

    Alpha Feedback - Nissan Leaf

    I was the user who gave Jason the original figure. I don't have a 40kWh Leaf and the number was based on what I could find online. Your data gives a much more accurate estimate than my research.
  9. JohnT

    Alpha Feedback - Nissan Leaf

    I recorded a 250km trip including 3 fast charges earlier this week but I have no way of knowing whether it was successfully sent to ABRP. Obviously i can tweak numbers such as reference usage @ 110km/h and battery degradation to get a match between my data and ABRP. However your numbers don't exactly line up, regardless of actual results. https://abetterrouteplanner.com/?plan_uuid=7d5ca443-9203-4f00-a84e-2d3c4091636b is a 249km trip averaging 6.22 km/kWh. Battery usage is 208% of capacity and working that backwards it implies the battery capacity is 19.2 kWh. The saved settings for this are 24 kWh model with zero battery degradation. That should be a (usable) battery capacity of around 22.5 kWh. Incidentally the speed limit in NZ is 100km/h - any chance of being able to put in reference usage @ nominated speed? For our car it appears to be about 5.7 km/kWh at 100 km/h and I have modelled using 5km/kWh @110. Here is my basic analysis of the trip data using both dash and Leafspy log data. The last couple of columns are my estimates of usable capacity and numbers below the table are totals for overall efficiency calculations. Time Odo Bat % km/kWh chg kWh SOC SOH GID 100% - GID 100% - Chg/Use 10:53:00 13521 87% 85.8% 90.0% 222 20.4 11:50:00 13590 32% 7.4 39.6% 90.0% 83 20.8 17.0 12:05:00 13590 65% 6.53 67.3% 90.3% 167 20.6 19.8 13:01:00 13648 23% 7.3 30.9% 90.3% 59 20.5 18.9 16:10:00 13648 23% 30.1% 90.7% 58 20.2 16:19:00 13652 19% 4.7 27.2% 90.7% 50 21.1 16:40:00 13652 70% 10.55 71.5% 90.7% 181 20.7 20.7 17:28:00 13709 25% 6.8 34.0% 90.7% 66 21.1 18.6 17:50:00 13709 80% 10.67 79.8% 91.3% 207 20.7 19.4 18:44:00 13779 23% 6.3 31.8% 91.3% 62 21.6 19.5 20.8 19.1 258 203% 42.1 38.8 6.12 6.65

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