Tesla Model 3 Supercharging Claim is BS

Tesla Model 3 Supercharging Claim is BS

Actually the Model 3 charges faster than claimed.

Tesla: Supercharge to gain 170 miles in 30 minutes.

@Bighorn and @SamO have reported charging rates as high as 118 kW or up to 59 kwh in 30 minutes.

At 234 watt hours per rated mile, 59 kwh gets you up to 252 miles in 30 minutes.

In reality, 118 kw rate will taper off over time as the battery pack charges up but you should definitely get more than 170 miles in 30 minutes.

Underpromise and over deliver. Go figure.

ReD eXiLe ms us | 18 december 2018

President georgehawley is often... AWESOME.

derotam | 18 december 2018

Just don't expect the top 170 miles to only take 30 min, bottom 170 yes, middle 170 yes, top no | 18 december 2018


jithesh | 18 december 2018

@derotam is right

Supercharging speed is high when charging from low charge compared to when the charge is almost full. For e.g. I usually go to super charger when my car is at 100 miles range and I get charged upto 300 miles so about 200 miles in 40 mins but the last 10 miles seem to take forever.

I have also seen my used to charge faster in summer compared to winter here in MA.

I am thinking what Tesla gave was an average charging rate based on certain conditions.

douger1la | 18 december 2018

Supercharging performance seems to vary by location and by load. I was at Cabazon in California, only me there, and like 20 chargers available. The system said it was charging at 400 miles/hr. At another charger in Orange County (that is ALWAYS full), two of the chargers are broken, but the super charger was only doing 170 miles/hr.

Iwantmy3 | 18 december 2018

The most you can add in 30 min. would be 217 miles. Lets not get carried away here. (170 is achieved in 20 min.) | 18 december 2018

Tesla under promises nonetheless. How did you arrive at 217? Curious

CST | 18 december 2018

I want my money back! Now I have no time to play Pole Position!!!

ST70 | 18 december 2018

@Iwantmy3- dumb@ss! it's 219 miles.....getting popcorn....

Bighorn | 18 december 2018

The taper is not easily accounted for as it is not straight line and cuts in at about 40% SOC. Seeing as most are working to arrive at chargers with 25-30%, only 10-15% will be at full speed or 31-47 miles. Also 236 Wh gets you a mile from the battery, but it takes more to add a mile to the battery. Now that supercharger speed is instantaneous in MPH, one can calculate the ratio to ~4.08 miles per kWh or 245 Wh/RM. The proof is in the pudding. Time a charge.

Bighorn | 18 december 2018

Also, the closer you are to the transformer/SC, the less the voltage drop.

nwfan | 19 december 2018

What's the urban Supercharger rate?
I'm getting high 30's max if plug in at 65 percent.

Foolish to charge above 80 percent unless you want to
give money and time to Tesla. Tapers off and easily drops
down to 8kw or so above 90 percent. I had to push limit on
long trip between SC. DFW to Childress. WB drive into winds
and elevation change. Charged to 95 percent and arrived Childress
with 16 percent range left.

Bighorn | 19 december 2018

72 kW. Not shared though. | 19 december 2018

@Bighorn: good point that adding a rated mile takes more energy than driving a rated mile expends it. A mile is not a mile. Since the Supercharger delivers a lot more current to the pack than the car sucks out of the pack when driving in normal conditions, more energy is expended in heating up the pack and internal wiring while charging than when you drive the car. I think the external voltage drop is accounted for in the power reported by the car which can't measure the external drop, just the net delivered power.

BTW, I can no longer find 170 miles in 30 minutes on the web site. Go figure.

I like 217 or 219.

Tesla says 310 miles for the LR battery. The EPA says 334.
Tesla says 75 kWh battery. Actual capacity is above 80 kWh with 78.2 kWh available.
Gotta love it.

Iwantmy3 | 19 december 2018

You must have been at a V3 charger.
The fastest charge rate I have seen anyone claim was ~493 miles/hour @118 KW. This actually works out to "only" 164 miles in 20 minutes. If anything, I am being overly optimistic.
During the warmer, summer months here I was paying fairly close attention to the charge rates I was getting. The charge seemed constant up to ~55% from what I could see. Bighorn may be right, It might not be a linear thing. However, I have assumed that it is. (Max power input = uncharged battery capacity X 3.4) Working through the math, I came up with 217 miles in 30 minutes. (219 would simply not be possible)

Iwantmy3 | 19 december 2018,
I don't think the available capacity could be more than 74 KWh. Achieving rated range requires 236 KW/m which works out to slightly less than 74KWh

ronbranch | 19 december 2018

I am just a week into owning my Performance Model 3 and I received 116kW 474mi/hr at a Supercharger in Houston. I took a photo of the screen but can’t post it here.

Bighorn | 19 december 2018

I’ve never seen the sum of SOC and kW exceed 160, so at 55%, I suspect you’ve already tapered to about 100kW. You’re correct that capacity is in the 72-74 kWh range based on 310 miles and ~236 Wh/RM.

Your pair of data points corroborates the ~4.08 miles per kWh that I’ve been seeing.

Iwantmy3 | 19 december 2018

I was able to get 782 km/h (490 m/h) @118 kW this summer. I posted a picture on another forum when I got 777 km/h (487 m/h) @117 kW.
post #170

Iwantmy3 | 19 december 2018

What do you mean by SOC? The battery charge in kW? or the percent charge?
The charge in the picture above shows 117 kW with a 45% charge at that time. That would mean ~33.5 kW of battery charge and 117 kW of charge rate = 150.5. Alternatively, 117 + 45(%) = 162

slingshot18 | 19 december 2018

I’ve seen 450mph.

TM3Q | 19 december 2018

Going to wait for much warmer far I get less than 40kW/h at a supercharger (120kW supercharger) even if the car was warm and being driving for 90 min on highway. Driving in freezing weather reduce my charging input power by 1/3 so far. It's expensive to charge at this rate and because I'm charge by the minute instead of by the consumption in kW.

I'm now using the public charger (220V) at a rate of 1CAD (0,74USD) per hour, ok it's pretty much slower and only around 6 kW/h. So it's longer to charge but I save 45% by using the public charging facilities.

So far I don't mind the time for charging as I'm visiting places and don't need the car right away.

Maybe Tesla will revise their fees or tier for supercharging where there are charging by the minute like in my province. In summer it will be ok but in winter SC station are too expensive vs public chargers stations.

Bighorn | 19 december 2018

State of charge in percent. 162 is a bit higher than I’ve witnessed and about 30 kWs faster than you’d see on my Model S. I see 481 MPH at 118kW, so I don’t know why 117kW is showing more than that in the photo. Conversion factor or Canadian spec?

Iwantmy3 | 19 december 2018

That picture was taken June 10th. I had only had the car for 8 days at that point. Fully charged it showed 507 km (318 miles) range. It may be that software updates since then have effected the values in these readings. Aside from that, I have no other explanations for the differences.

There was a thread on these forums around that time where people claimed charge rates even better than these .

Bighorn | 19 december 2018

Interesting—310 was my range charge in August. Still a sum of 161 with the adjusted 225/507. I saw a claim of 150 kW charging which makes no sense given the capacity of a supercharger being either 120 or 135 kW.