Request to an owner: supercharging rate

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McHoffa

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#1
Wondering if anyone that has their car could do a time lapse video of the screen showing charging from near 0% to 100% at a supercharger. I'd really like to see the curve of the charge rate vs the percentage.
 

danzgator

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#3

McHoffa

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#4
It's doubtful that you're going to get anyone to sit at a charger that long because a) there's never a reason to risk getting that low, b) it is painfully slow to charge to 100%, c) it costs money to Supercharge in a Model 3. One of our members is working on curves with the available data though here: https://teslaownersonline.com/threads/model-3-charging-curve.5112/page-2#post-60035
I would do it if I had mine. Not to 0% but maybe 5%. I would find something to do while it's charging for an hour or so.
 

McHoffa

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#6
Have you seen this clip?
That gives a good idea, but I'd like to see that over the entire charge to see the full rate of charge over time in the real world. I want to do the math to figure out what it will actually cost to use the supercharger here in NC since they charge per minute. $0.16 per minute while it's over 60 kW and $0.08 per minute while it's under 60 kW. It will be interesting to see if it's more or less (or close to) the actual cost of the kWh used.
 
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#7
That gives a good idea, but I'd like to see that over the entire charge to see the full rate of charge over time in the real world. I want to do the math to figure out what it will actually cost to use the supercharger here in NC since they charge per minute. $0.16 per minute while it's over 60 kW and $0.08 per minute while it's under 60 kW. It will be interesting to see if it's more or less (or close to) the actual cost of the kWh used.
I'm still trying to figure this out, is that over 60KW capacity or 60KW charge rate?
 

KarenRei

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#8
I'm still trying to figure this out, is that over 60KW capacity or 60KW charge rate?
kW is power, not capacity. kWh is capacity (energy).

They charge you more when you're charging at a higher power, which is only logical, since that means that the charger can't provide as much power to the paired stall, and can mean higher demand charges.
 

L. David Roper

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#9
Does a Supercharger have a high power plateau (~110 kW) for about the same time interval no matter what is the initial SOC of the battery? If so, is that because of heat being generated in the battery?
If not, how does the power plateau time interval change with initial SOC?
 

KarenRei

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#10
Does a Supercharger have a high power plateau (~110 kW) for about the same time interval no matter what is the initial SOC of the battery? If so, is that because of heat being generated in the battery?
If not, how does the power plateau time interval change with initial SOC?
No. The high power plateau is based on your current SoC. Whenever your current SoC gets high enough that the battery can no longer accept such high charging currents, the charging rate is tapered. Initial SoC is not important, except when thermal issues are at play (e.g. for a cold battery you have to wait for it to heat up). Also, sometimes very low SoC batteries need a longer ramping up time before they can be charged at the maximum rate.
 

L. David Roper

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#11
Thanks for the great work you have done collecting charging data for the 3LR. Are there sufficient data for the 3LR to have curves of power versus time for different initial SOCs, say ~0%, 25%, 50% and 75%?
 

Stats App

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#12
Here is a example of super charging rate (my car). As the SoC increases, the charge rate decreases almost linearly.



linear-png.12006

[mod edit commercial self-promotion link removed per forum rules]
 
Last edited by a moderator:

L. David Roper

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#19
Thanks. I am doing a mathematical fit to TM3LR charging curves for different starting % SOC.
My last question is: What was the % SOC when you started charging?
I will post curves after I finish.
 

Stats App

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#20
Thanks. I am doing a mathematical fit to TM3LR charging curves for different starting % SOC.
My last question is: What was the % SOC when you started charging?
I will post curves after I finish.
SoC at the start was ~20%. On the graph's x-axis you can see the SoC for each data-point.
Charge rate as a function of SoC is almost piecewise linear.