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What charge rate (miles added per hour of charge) did you get at the Supercharger?

Today I dropped off a friend to pick up his Model S at the Hawthorne Tesla facility near LAX and while there, I plugged my own Model S into the one of the Supercharging stations.

Two of the 4 stalls were operational. My battery was at about 120 rated miles when I plugged in. According to my dashboard, it charged at a rate of 85 to 90 miles per hour which is substantially slower than the announced rate. The rate was pretty constant for the hour that I was there.

I asked the delivery specialist who was working with my friend why it was so slow, he said that this was a typical charge rate for this facility at the moment, and they intend to increase the rate in the future. 90 miles per hour is more than 4 times faster than my garage 240 V outlet (my High Powered Wall charger is on backorder) so I am not complaining, but for those planning a long road trip and counting on a 45 minute charging session giving them 150 miles of additional range, they may need to allow more charging time en route.

If you have used a Supercharging station, please let us know which station / when / what charging rate you achieved. Thanks.

I used the Folsom supercharger last weekend (Friday at about 6:10pm). When I started charging (I had only 56 miles of rated range left), the charge rate was 239miles/hr (354V@225A...almost 80KWhr). After about 1hr 15 min, I had a full "standard" charge with 240miles of range on the battery. The charge rate as it was at 239 miles of range was 144 miles/hr (397V@72A).

Why do I have such detailed info you might ask??

I took a photo of my dash screen just after starting and just before the standard charge ended.

I had posted my experience here http://www.teslamotors.com/forum/forums/1021-miles-3-days-using-supercha...
all but tne Folsom supercharger. lots of photos of the screens in the travel blog mentioned in that thread.
also note that if your charge level is closer to full, it will charge a lot slower than if it was near empty.
so your delivery specialist may be right about the Hawthorne supercharger or not, maybe someone has charged there while nearly empty and got a faster charge?

I can't understand why the superchargers would not be charging at the full advertised rate. They're making a strong marketing push with these superchargers. This is something that needs to be corrected.

The closer to empty the battery, the higher the rate of charge. All charges work this way, car chargers, AA battery chargers, iPhone, laptops.

Tesla even clearly states that the charge rate ramps down closer to full.

Constant current -> constant voltage -model works out that you will get constant charge rate up to some point after which you will get diminishing returns. It wont be higher at very low than it will be at a bit less low as long as you stay into "constant current" part of the charging cycle.

Not quite. At constant current phase your charge rate will increase together with voltage. 225A*354V=79,65kW while 225A*380V=85,5kW.

The charge rate will increase until voltage hits the battery max voltage. Then the charger must gradually decrease the current so the voltage stays constant. This is the constant voltage phase. Here charge rate will continously decrease until the battery is full.

So charge rate is never constant over any significant amount of time. First it will rise slowly, then decrease faster.

Something still doesn't seem right. Based on Portia's blog above, even when they were down to 16 miles rated, the charging rate was nowhere near 300/hr. Throughout their entire trip, the charging rate never seemed to go above 200/hr.

@Lou in SoCal

It's not an "error" that needs to be "corrected". The starting charge rate depends on the initial state of charge (SOC) of your battery, and ramps down once the SOC hits a certain level. This is to avoid ruining your battery.

@Lou in SoCal

Also, the superchargers are advertised to get you about a half charge in 30 minutes. Tesla never promised a particular instantaneous rate of charge, nor does it make any sense for a Model S owner to care what that might be.

As I've stated above, the charge rate is extremely high at the beginning of charging, but slows down as the state of charge of the battery nears full. So, it's unfair to expect an average charge rate of X miles/hr. It is fair to assume some charge rate for the first 30 minutes starting with a battery state of charge below 25%. This is what was announced at the Supercharger event - it assumes a battery that is near depletion.

@jkirkebo Not quite. At constant current phase your charge rate will increase together with voltage. 225A*354V=79,65kW while 225A*380V=85,5kW.

That just means that you need more power to keep up same charge rate. In charging it is amps that go into battery that matters, not the power that is used to get it in.

Also not all six supercharger stations are rated at the same kWh right now, but tesla clearly states this on the face of the unit. So it's still as advirtised.

Tesla also states "up to 150miles in 30 mins", so 1 mile in 45 mins is still as advertised.

Timo: Depends on your viewpoint I guess. It is watts you put into the battery and watts you draw from it. A full battery delivers more energy per amp drawn since it does this at a higher potential (ie higher voltage). This is why the 10% SOC from 90% to 80% will get you further down the road than the 10% from 30% to 20%.

I have been on the phone a lot with the tech guys for the supercharger stations. The newer stations are 120 kW, while some of the older stations are 90 kW (and they are working on upgrading those). if you understand the station layout, 1A and 1B are on the same circuit, and 2A and 2B are on the same circuit and so on; so, if you are right next to another Tesla charging, you are sharing that circuit. It is better not to charge next to another Tesla if you have a choice. There is also a max charge rate of the whole station. First car in gets first priority of the most power, and then as he leaves, priority jumps to the next car in line. I went to one stall at Tejon Ranch (120kw station) with 4 other tesla's (I was the fifth car, and only 6 chargers). I was down to 20 miles range, so max charge should be allowed. First spot (2A) only 30kw, then after a few minutes jumped to a rate of 60 kw, moved to the end (3B) and only 30 kw rate. Then the guy in 3A left, and I moved in right behind him, and it may have kept his number 1 priority, because charging ramped up to 122 KW immediately!! 398 mi/hr. Went to the bathroom, got a quick yogurtland, and 220 miles on the range. Moral of the story- don't just plug in and walk away...You could be there for hours. I always make sure that it is charging and at full rate. Not every spot is the same. The technical team has told me that the goal is for 80% charge in 45 minutes or less, and that usually holds true.

@drgrant
It's not always adjacent spots that are sharing a charger I discovered.

I have discovered that the 1A, 1B, 2A, 2B pairings are not always consistent, and have seen wildly different charge rates at the East Cost Superchargers. At the newest ones, like Glen Allen and Port Orange, I have seen 348 miles per hour when charging from a low SOC. On the other hand, at almost empty last week, I got only 97 miles per hour at the Newark Supercharger, even though I was the only car there. I switched to another stall and got 120 miles per hour, but still way below guidance.

It clearly isn't always about SOC - often the Supercharger equipment is not consistent in either watts or amps from one stall to the next, and one SC to the next. I no longer "count" on a half charge in half hour at an upcoming supercharger - we may find all the stalls occupied and be downshifted to half the normal charge rate - could require two hours instead of one to range charge. EV's, even Teslas, still require some flexibility and forbearance from owners.

I have a 60, and I recently used 3 Superchargers in a day. I drove 541 miles that day. They seem to work as advertised. Free and charge enough to get to the next Supercharger in about the time it takes to eat a meal.

Also the Supercharger page says 170 miles in 30 minutes, which would be 340/miles per hour of charge. I saw 339 mi/hr on my 60 @ 46 miles of range so they are delivering exactly what they say.

At my first stop I only charged as long as it took me to have lunch at In-N-Out.
I started to charge at 12 miles of range, finished at 149.
I got 137 miles in 37 minutes.

Turns out I should have waited for about 3 miles more since I got to the next Supercharger with -2.5 miles, but that was my fault and I made a detour.

For my second stop, even though I had a detour and I hit 0 miles of range 2.5 miles from the Supercharger I made it there and charged from 0 to
46 miles in 10 minutes
88 miles in 20 minutes
150 miles in 41 minutes
160 miles in 46 minutes

For my third stop, I had dinner and was over 150 miles before I finished eating and got home with plenty to spare.

One thing to note is that the MPH rate on the screen is the average for the visit while the kW rate is instantaneous. So it will appear that you are still fast charging when in fact the amps have tapered to almost nothing. I've seen as high as 124 kW and around 400 MPH at the outset. Half hour would typically give 140 miles.

I don't use superchargers often, but I have used both Gilroy, CA and Vacaville, CA and each time I get 87kW charge rate, even with no one else there and a low battery. Yesterday I was down to twelve miles rated when I started charging. It did creep up near 90kW after a while, but not up to the elusive 135kW charge rate advertised. Gilroy has a couple original 90 KW chargers, but I was using a very new charge bay. Took pictures of all the equipment.

Any ideas? Are some older Model S not capable? Mine is an 85kWh version delivered in March 2013 with only a single charger, but I was told that would not affect my supercharging.

The tapering down as you fill was described by Elon as being similar to pouring water from a 32 oz pitcher into a 12 oz glass. The first half fills rather quickly and the last part tapers off and takes longer to prevent spilling. An apt analogy.

@srotomalset
You probably have an A battery. I saw 122kW at Gilroy, IIRC.

Thanks Bighorn, I didn't want to be the one to bring up the battery question........


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