BlueLightning wrote:This is where my coefficient come from, 13.44 x 1.2 = 16 kw-h
A ratio of 60/50 or a coefficient of 1.2 is the best match for my iOn electric car which have a 16kWh battery capacity. In other words, this coefficient seems to give a proper result, but for my car only...
Now I understand where you get 60/50 or 1.2 from. But that is based on your assumption that your car has a 16 kw-h battery capacity. But that is not achievable.. How old is your imiev? and with how many km? Maybe you only have 15 kw-h..?
While driving, I get a higher slope, 0.1527 kWh per % SoC, but this number is also too low because those kW-h are a mixture of Wh-out when I press the accelerator and Wh Reg when I slow down.
But you do not know if this slope is too low or too high. If Wh-out is correct and Wh-reg is too low, this slope will actually be too high..
No matter about no coefficients, your equation will give a number, if by the time your battery capacity decreases, this number will also decrease.....
I have done some testing today and yesterday. I find slope to be 11,64 and 11,60 for charging. Correcting with your factor 1.2 that is 13.97 and 13.92. I find slope to be 12,43, 12,32 and 13,27 when driving. Assuming that SoC is correct, the the formula for my car Wh-out/Wh-reg is between 1,07 and 1,14.
I see a difference between Wh-reg and Wh-out that is unexplainable by physical processes (i.e. it is not possible to drain more energy than is supplied to the battery) and it must be due to measurement or computing problems.
I will do more testing to find how consistent the numbers are on my imiev.
I today drove the car as low as a SoC of 17.0 in the morning and in the afternoon the slope increased by almost 7% for the same drive the day before.
I think that my car assumed that battery capacity increased because I emptied the battery more than I have done for a week or two..