Energy usage discrepancy

[slobodanc]

I am bit puzzled by the different displays so could use some help trying to reconcile apparent discrepancy.

Trip 51 km
Climate only used for 5 min at 0.4 kW, so negligible.

Energy Consumption display

(smaller display behind steering wheel)

Showing 13.7 kWh/100km

Trip = 13.7 / 2 = 6.85 kWh

Battery SOC display

71%

Usable energy is 27 kWh

Trip = 27 * 29% = 7.83 kWh

So I have energy consumption showing that I burned 6.85 kWh while battery SOC is showing 7.83 kWh????? It seems to be more than just a rounding error. Or is my math wrong?

thanks

 

[JejuSoul]

Did you reset the energy consumption at the start, so it is only counting this trip.

Even if you did the SOC displayed on the dash isn't particularly accurate.
The better way to get the Energy Values is to run Torque Pro

 

[slobodanc]

Yes I always reset.
Also I clear history periodically, but seems it still has some impact on the current trip even when there are few entries remaining in history.

Yeah, I guess it is not all that accurate. Good to know,

thanks

 

[SoulEV2016]

You can not predict trip with % and average consumption.

That's why i don't understand why car maker don't display the Energy counter (to view the real consumption on "a" travel).

On Torque Pro, like jejusoul indicate, you can view this : http://www.mykiasoulev.com/forum/viewtopic.php?f=6&t=471&start=180#p5494

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[JejuSoul]

.... is my math wrong?...

No, the math is correct. You could show it a slightly different way which I think is more useful. And by keeping data over a period of time you can begin to see trends in the data.

d - distance travelled. : 51km
c - energy consumption : 13.7 kWh/100km
s - percentage of SOC used : 29%

e - energy consumed = distance travelled * energy consumption / 100 = 51 * 13.7 / 100 = 6.99 kWh
p - implied pack capacity = energy consumed / percentage of SOC used * 100 = 6.99 / 29 * 100 = 24.1 kWh
h - implied State Of Health = implied pack capacity / original pack capacity * 100 = 24.1 / 27 * 100 = 89.3 %

In reality I expect your SOH (State Of Health) is 100% and the 89.3 % calculated is reduced by measurement errors and rounding errors.
You will get a better idea by collecting more data over a few different seasons, and with more trips of longer distances.

You can see an example of data collected this way in the spreadsheet by mtndrew1 - https://docs.google.com/spreadsheets/d/1kfyB1q3LMKcM1OzCnLp-CJxcLANAaIMZHRgBmgQgxGw/edit?usp=sharing

 

[SoulEV2016]

information for the discussion :

http://www.mykiasoulev.com/forum/viewtopic.php?f=6&t=471&start=180#p5491

 

[slobodanc]

Interesting, thanks