Looking for Model 3 benchmark data

[bwilson4web]

Hi,

I use the EPA roll down metrics to generate performance curves for mph vs MPG. So far, the EPA has listed "Long Range Model 3" and "Long Range AWD Model 3" metrics but they need calibration benchmark data to correct for unknowns.

What I need are user benchmarks, 10 miles (16 km) at a constant speed with the watts/mi (or mi/kWh) along with the temperature. BTW, I can handle metric as well as SAE units. The 10 miles should be either on a circular route (i.e. a by-pass loop around town) or two, opposite direction runs at the same speed. This takes out most of the elevation and wind effects. In an ideal world, temperatures above 50 F (10 C) make it easier for me.

Based on the preliminary chart data, three speeds are needed:

• ~25-40 mph - this helps identify the fixed overhead, the kWh expended with car rolling
• ~45-55 mph - this covers the middle of the high speed range
• ~65-85 mph - this covers the upper hight speed range

I can then adjust the curves to more accurately match the car's true performance over all speed ranges. Having the chart, we'll have a guide to handle maximum range conditions for:

• "Long Range Model 3"
• "Long Range AWD Model 3"

Bob Wilson

ps. Current chart without calibration benchmark data:

left Y - HP required at different speeds
right Y - estimated range at different speeds

 

[bwilson4web]

Here is the updated graph:

The data suggests the fixed overhead is ~700W. This is the power needed to keep the car systems up.

Bob Wilson

 

[bwilson4web]

A better version of the initial chart. Using the left Y-axis for range and right Y-axis for HP:

There is some variability in the vehicle overhead which should be in the 700-800W range. Getting a benchmark in the 20-30 mph range would nail it.

Bob Wilson

 

[bwilson4web]

So this is how I'll benchmark our Standard Range Model 3:

       trips                                       mi  drive total
Brentwood_HSV                                      102 01:45 01:45
HSV_Tupelo(super)_Memphis(super)_Hollywood         290 05:01 06:01
Hollywood_Memphis(super)_Tishomingo(NEMA14-50)_HSV 275 05:09 07:39
                                         Total     667 11:55 15:25[/FONT]

So I'll pickup the Standard Range Model 3 in Brentwood TN and drive home. There is a NEMA 14-50 along the route as well as a SuperCharger in Athens. With only 50 miles to the NEMA 14-50, the battery would still be in the taper range. Even the Athens SuperCharger will be close to the taper region. I don't learn anything with either. Once I get home, my JuiceBox Pro 40 will give charging metrics and determine if the maximum L2 charge rate is 32A or higher.

The Huntsville to Tupelo, Memphis, and Hollywood casino will be deep, ~50%, into the battery. In theory, I could reach Memphis on one charge, it could close. The route to Memphis is a divided but not an Interstate route so modest speeds, no more than 65 mph, are likely. I my try the direct route after getting some 'seat time.'

Returning to Huntsville via Memphis and stopping at the Tishomingo State Park, NEMA 14-50, offers a chance to sample a midway, L2 charge. This replaces the gap between Little Rock AR and Tulsa OK where there is only a 30A, L2 charging spot, 6 stations.

This will let me get the important parts tested within the Tesla return policy:
https://www.tesla.com/support/tesla-return-policy

. . . If you have taken delivery of your vehicle without ever having taken a test or demo drive with us, we understand that you may want additional time to get to know your vehicle. In that case, you will have seven (7) calendar days after delivery to return your vehicle, subject to the terms and conditions of this policy.

We will accept your vehicle for return if the vehicle:

• Has an odometer mileage of less than 1,000 miles at the time of return;
• Has a New Vehicle Limited Warranty for the vehicle that has not been voided;
• Has not been the subject of any submission or application for any available incentives or perks;
• Is in new condition, without damage or abnormal wear and tear; and
• Has not been resold or transferred to any person or entity.

Bob Wilson

 

[bwilson4web]

The Huntsville to Tupelo, Memphis, and Hollywood casino will be deep, ~50%, into the battery. In theory, I could reach Memphis on one charge, it could close. The route to Memphis is a divided but not an Interstate route so modest speeds, no more than 65 mph, are likely. I my try the direct route after getting some 'seat time.'

Using Google map, I took another look at the Huntsville-to-Memphis SuperCharger route staying on highway 72. It looks like:

• 202 mi of 220 mi range = 92% of range, 18 mi reserve
• 3:50 drive time ~= 52 mph average speed, estimated 400 mi range

It makes sense to test a maximum range segment early. It will also help validate the mph vs range chart.

Bob Wilson

 

[brulaz]

Bob, the first graph gives different numbers than the last two.
I assume the later ones are what you are using?
Looking at the last graph, it appears that the reported EPA range (310, 325mi) is equivalent to driving at almost 70mph on your graph.

 

[bwilson4web]

. . .the reported EPA range (310, 325mi) is equivalent to driving at almost 70mph on your graph.

Correct. I was using the long range versions to see if I could get estimates of what the Standard Range Model 3 does. I really need to have a test article (my next car) to handle calibrating the curves.

Would you like a copy of the spread sheet?

Bob Wilson

 

[brulaz]

Correct. I was using the long range versions to see if I could get estimates of what the Standard Range Model 3 does. I really need to have a test article (my next car) to handle calibrating the curves.

Would you like a copy of the spread sheet?

Bob Wilson

Many thanks, but I'll hold off on the spreadsheet until we actually have an electric car to play with.

 

[Feathermerchant]

Try using abetterrouteplanner.com and the trip planner in the car. They both work reasonably well. The trip planner in the car will tell you to slow down or turn around if need be. The in car planner does not take into account rain or wind. Both of which can significantly affect range.