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FIRST MAJOR TEST

Going to Las Vegas Thursday, but what do you think? Inland Empire to Barstow, no problem. Barstow to Las Vegas SC, 90+ degrees, Baker Grade, 75 MPH and approx 175 miles. I can easily charge to 240 miles the nite before. I'm thinking no problem.
SoCal Burt

I don't pick up my S85 until 4/24, but that is one drive I am counting on being able to do, and the first one I intend to make. Google maps says it is 161 miles between the Barstow and Las Vegas SCs, which ought to be easily doable, right?

@Burt,

I've driven to Vegas in my 60 6 times, and even I don't have a problem. If you want to conserve, drop your speed on the climb and open it up on the downhill. Should save you about 20% range.

Burt Court,

Please report back on how it goes. Do you have the 60 or 85?
Within the next few weeks I plan to make this my first trip, and am very interested to see how you do.

I have the P85 and can charge to 303 miles, but I also like to drive at least 75 mph. How fast will you be driving?

If you can let us know how the Barstow charging station works out?
Are you staying at a hotel that has a charging port, or will you use Tersla's before you head back?

I have the S85, 66 days old. I will hold the speed down to 75 with diligent use of cruise control, but refuse to use slow lane unless you come up to pass me. If all works well, will move up to usual LV to LA speeds back to Barstow. Will report back here over the week-end.

If this post get buried, can you e-mail me your results?

Sterlingllc1@yahoo.com

I am making the trip tomorrow. Unfortunately my MS wont be delivered until next week so I will be in my F150 Supercrew 4x4 instead. Actually should get 20+mpg with 6 people thanks to the ecoboost engine, but I can't wait for the Tesla. If I see any Tesla's on the side of the road I can stop and help...

Sterling;
After a day or two (for the bots to get around to it), Volkerize.com uses Google search to find any word combos on the site, so you can find this again, easy. If necessary, stick a post in here with an unusual word to search for, like sesquipedalian.

Oh, I just did! ;)

Tks, look forward to hear you trip results.

I've driven LA to LV and back twice. Barstow SC and the LV SC both work great. Only concern I had was a 20 mph wind coming straight at me LV to Barstow. Cruise control at 65 until Baker and I had plenty left so it was 75 mph from Baker to Barstow and I arrived with about 40 range. Easy peaty.

Golftoday,

Were you driving a 60 or 85?

Burt, good luck tomorrow!

85. I charged to about 250 at the LV SC and drove very conservatively until Baker. If I had a 60, I might have stopped at the Level 2 charger at Whiskey Pete's at Stateline. But it's also very possible a 60 could have made Barstow by slowing to 60.

Why didn't you charge it full to 300?

Have some of the data and specs for the Vegas round trip if anyone cares...

Yes @Burt. Please post!

@Sterling
I'll bet he's talking rated ie~265, not ideal, miles. Those last few take a long time to load.

Burt, give up the goods, we want every last detail......

And how much did you win/lose at the tables Burt? I got a baaaaaaad feeling.

Never have payed attention to these stats before but here goes:
Rancho Cucamonga to the top of Cajon Pass, used 530 W/mi, to Barstow leveled out to 353 W/Mi. Drove 78 MPH, no A/C. (Tried going 75, to dangerous, was afraid I'd get run off the road) Charged to 225 miles at Barstow and averaged 396 W/Mi to Las Vegas SC where I charged at a rate of 320 Mi/Hr at 380V, 158A. Only charged to 200 miles for return to Barstow. BIG MISTAKE! Baker grade and A/C killed me, got to Barstow offramp at zero (0). Extreme case of range anxiety. Note to self: Plan better next time, speed/wind/steep up hills, and learn alternate charging stops

Burt,

Being only a week into my car, I really don't understand the W numbers.

How many miles was it from Ranch Cucamonga to Barstow, and what did you have left when you rolled in?

How many miles did you have left when you got to the LV SC, and finally, since you have the 85, if you had charged a full charge in Vegas, would have made it to Barstow no problem?

The only place you can stop on the way to Barstow from Vegas is Primm, and that is a level 2 station, but an extra 28 miles for an hour of shopping could ease the nerves. I think that I will plan to do that.

RC to Barstow is only 72 miles, but the Cajon Pass is fairly steep. I recharged to 224 miles there and had 30 miles when I got to LV. Should have charged more before leaving LV, or topped off at Whiskey Petes, but didn't think I needed to. All future trips will include some method of overnite charging at either friends, hotel or motel etc. Also learned that driving under 75 on most open freeways is unreasonable and really cuts into range planning.

Tu

Am in Vegas. Averaged 70 mph from LA to Vegas and used 274Wh/m. Charged to 196 in Barstow and arrived with 28 miles in north Las Vegas.

I'm convinced the MS60 is 15% more efficient to start. I again employed a technique of dropping speed 5-10mph on steep climbs and opened up the speed (by coasting in neutral) on the downhills.

Downhill speeds averaged 80-85mph. Used regen when speed got too high.

SamO said: "I again employed a technique of dropping speed 5-10mph on steep climbs and opened up the speed (by coasting in neutral) on the downhills."

How long were these climbs and descents?

For small hills, I think it's a good idea to coast downhill, picking up speed, and then to use that extra speed, rather than electricity from the battery, to help you up the next hill. So you speed up going downhill and slow down going uphill.

But, on long descents, the car will not keep picking up speed forever, because air resistance is higher at higher speeds. If you let the car coast downhill at constant speed, limited by air resistance, you're wasting the energy that you could have recovered by using regeneration to limit yourself to a slower speed.

I used to use this same technique going to and from Vegas in my Lexus, and really increased my gas mileage. I will use it again in my MS.

@Sterlingllc1
@Bighorn is correct. I only look at rated miles. 250 was not totally full but after 250 it goes really slow. I thought 250 would be enough so I stopped. I think 100% full is only about 265.

@SamO thanks for the tip on coasting. I've now used it a few times successfully. You have to watch out on really steep downhills, but on moderate ones it's pretty cool.

@ye

All of the climbs, total, between Barstow and Vegas are less than 25 miles. Several are very steep 6%+ grades.

The car will continue to pick up speed greater than 93mph. I usually prefer coasting but in those circumstances, for safety, I will engage drive and allow motor braking/ regen to recharge the battery rather than risking an unsafe speed. You are wasting a small amount if energy (yes it is wasted) but traffic, police and general safety are real world considerations.

@sterling & golftoday. Please report back on your coasting results.

I should have mentioned that I employed the same technique from LA to Barstow and was able to average 243Wh/m over 126 miles. But my average speed was only 67mph.

Sterlingllc1 said: "I used to use this same technique going to and from Vegas in my Lexus, and really increased my gas mileage."

I assume the Lexus didn't have regenerative braking. In that case, there's no reason not to coast downhill, as fast as you want to, for as long as you want to.

SamO said: "All of the climbs, total, between Barstow and Vegas are less than 25 miles. Several are very steep 6%+ grades."

The important thing, I think, is how long each downhill stretch is, separately. Is it short enough that the car, if coasting in neutral, is still speeding up when it reaches the bottom?

SamO said: "The car will continue to pick up speed greater than 93mph. I usually prefer coasting but in those circumstances, for safety, I will engage drive and allow motor braking/ regen to recharge the battery rather than risking an unsafe speed. You are wasting a small amount if energy (yes it is wasted) but traffic, police and general safety are real world considerations."

Ignoring air resistance, regenerative braking wastes some energy compared to letting the car speed up downhill. But air resistance causes the car to speed up less than it otherwise would, and that wastes energy too. So the question is, which wastes more energy?

Coasting on a long downhill stretch, the car will eventually stop speeding up, its speed limited by air resistance. After that point, all the energy that you could have gotten from the rest of the downhill stretch will be wasted, used up in overcoming air resistance. On the other hand, if you use regenerative braking to limit yourself to a low speed, you get to recover energy from the entire downhill stretch. Not all of the available energy, granted, but some fraction of it.

So, for a long descent, it pays to use regenerative braking for most of it and only switch to coasting near the end.

I should say that this is all theoretical -- I don't have a Model S to try it on -- and of course you should believe the actual numbers that you get in practice. But knowing the theory may help when trying to interpret real-world data.

Haven't done the math but based gradient, wind and accessory load there is always speed at which the @88% efficient regen is a better option. Since gradient changes a lot so does the optimized speed. My swag is that it is between 65-80 mph for most freeway grades.


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