# Forums

The last couple days my wife and I finally decided to go visit the car we will soon own.... well hopefully this year at P3270. The car on display there is the red one that has been traveling the country quite a bit so I don't think there are too many things I can add to that discussion. What I did do on the way up is log speeds and tried to come up with what it would have been like in an EV. The weather was cool 70-80s on the way up so we did not use the A/C. On the way back we did. I'll write this as watts out since different people will use different batteries.

If I have my notes right it would have gone something like this:

Home to HWY 44 was 5 miles at 35 MPH using 200w per mile = 1000 watts
HWY 44 in traffic to across the river was 5 miles at 60 MPH using 275w per mile = 1375 watts
Traffic cleared and I did about 65 MPH to Springfield for another 95 miles at 300wpm = 28500
Once there we checked out the only public charge adding another 5 miles at 40, 204w = 612
Total to Springfield was 108 miles using 31487 watts... lets round up to 32kW.

The charger we found in Springfield... well all chargers we found on the trip... are single phase 208, 30 amps... or about 5,000 watts per hour of charge. We spent about an hour walking around a near by park to stretch our legs then back on the road..... adding 5000w.
The battery would be around -27,000watts when we left Springfield.

(take note the wife is now driving)
From charger to hwy 55 was 14 miles at 40MPH using 204 wpm = 2856 watts
hwy55 at Springfield to Bloomington was 51 miles at 70MPH using 327wpm = 16677
Off hwy to the college district for lunch took 6 miles at 35 mph using 200 wpm = 1200
Total to this location not including previous was around -20733watts.

We have a friend that lives in Normal so we hung around for about and hour and a half. The chargers, we checked all of them, were 208 volt at 30 amp. If we charged we would have gained 15000 watts.
My friend said he had no problem with me installing a Tesla 90 amp charge at his house. "You supply the parts and I'll supply the electricity." That might be an option if Tesla doesn't install chargers.
The battery would be around -32733 watts as we hit the last leg.

(take note the wife is still driving)
Leaving the parking garage in Normal, Ill we traveled 4 miles at 40MPH using 204wmp = 816
HWY 55 to Chicago side streets was 110 miles at 70MPH using 327wpm = 35970
Side streets to are hotel was 9 miles, about the same to get to Tesla, at 35MPH using 200wpm = 1800
This took out an additional 38586 watts.
The battery would be at -71,319.

There were no other chargers until Chicago and I did not see a charger in the Mall Tesla was in but I imagine there is or will be one, probably a super charger. I forgot to ask.

ONLY a 90KW battery would make this trip and even that would not make it with the A/C on and the typical 90+ heat in our area. Not to mention when I drove home the next day I was traveling 75-80 MPH at night with the A/C on so this would have been a fail without spending several hours to charge somewhere which you and I might do but no other red blooded American ICE driver will. My dad never even stopped an hour. We had 5 minutes to pee at a rest stop and we were back on the road. 15 minutes at gas stations.

I point out this trip just to make it clear how super chargers will be required at least every 150-200 miles and for others to think about their battery choices. I will still purchase a 60kW battery and not use this car for road trips. It is my opinion that a 500-1000 mile battery would be the sweet spot for traveling with a 1 hours super charge ability. It's realistic range with the 20% grace for the battery would be about 300 to 600 miles with the air on at 70 to 80 mph which is what most people travel at in the midwest.

Has anyone made up a watt per mile chart with the A/C on at the 90+ temps?

Does anyone else want to post a trip and see what they would come up?
Using the watt per mile charts that are posted in the forum makes it fairly easy.
I know people here are taking road trips in theirs ICEs, treat it like and EV and see what happens.

wholland | 20 mei 2012

@ Sudre - Thank you for taking the time to calculate the above. I found it very informative. I agree that without a super charger network, the Model S is not a realistic "road-trip" car. Daily commuting well within our battery's range is the selling point for the S. Any significant road trip is still the domain of ICE's. However, that will probably change as battery tech and chager networks evolve in the next 10 years.