Supercharging Tesla Model S 70 & 85 kWh – Video Comparison

SEP 13 2015 BY MARK KANE 10

Supercharging Tesla Model S 70 kWh vs 85 kWh

Supercharging Tesla Model S 70 kWh vs 85 kWh

Bjørn Nyland, now full-time Tesla blogger – and future Model X Founder Series owner, presented comparison of the Tesla Model S 70 & 85 kWh Supercharging (see also 60 vs 85 and 60 vs 85 vs 85 CHAdeMO).a

The larger battery pack accepts slightly higher power, so the 85 kWh version adds miles quicker.

The difference grows from 9% at 62 miles (100 km) to 29% at 163 miles (262 km) of added range.

In other words, buying an 85 kWh you not only gets more range, but also the capability to charge quicker.

On the other hand, this is just 11 minutes of difference between 38 minutes in 85 kWh and 49 minutes in 70 kWh, so not a big deal unless you use Superchargers often

“A comparison between the 70 kWh and 85 kWh battery pack when supercharging. Notice that during the charging, the 70 kWh power goes up and down. This is probably due to heat so the battery management system will temporarily reduce supercharger power until the temperature is at a safe level where the battery won’t take permanent damage.”

Categories: Charging, Tesla

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10 Comments on "Supercharging Tesla Model S 70 & 85 kWh – Video Comparison"

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A cool way to further reduce recharge time would perhaps be the following:

When a Tesla approaches a SuperCharger the car could “pre-cool” the battery allowing for faster charging.

All in all they are on a promising track. I’m looking forward for the 100km refill in 10 min milestone for the Tesla Model S100.

Even cooler would be active cooling via SuperCharger 2.0 which will add cooling for the battery pack using liquid nitrogen… (although this might make the plug far more complicated…) Maybe just connect the AC system to the battery cooling…

Ummm… are you joking?

Supercooling the battery pack via liquid nitrogen does not appear to be good for battery longevity. Can you say “embrittlement”? In fact, since cold (below about 20° F) batteries don’t hold a charge well, it doesn’t appear to be even practical from an engineering standpoint.

I also don’t even want to think about how much that would increase the cost of building and maintaining a Supercharger station.

I take it high density Super capacitors are still not viable to take a quick fill and slow charge the real battery pack – to further speed things up ?

Too large and too heavy. Ultracaps are used to buffer brake regen on the few experimental vehicles that use them. Buffering would not be useful for a full charge application like supercharging.

Right. “High energy density” supercapacitors have maybe 2-3% of the energy density of li-ion batteries. Not in the same ballpark.

I like this because it really isn’t relevant in the wild, to go much beyond a 200km, or a 125 mile pit stop. From a low value, like 11km remaining, the car is in its sweet spot of being able to soak 115kw for longer. Then, it is off to the next supercharger, usually with some miles to spare.

The extra 6 minutes, to typical “ICE” passengers can go by slow. The reason is that once you stop, go to the bathroom and buy a snack, the time you’ve spent in the “time goes fast” zone is over.

Spending what little time it takes a Tesla to charge is nothing, in the grand scheme of things. It is harder for many to leave an old paradigm behind.

I noticed the Voltage going into the “70” was approximately 50 volts less than going into the “85”: not really a relevant comparison as the total wattage into the 70 was much lower than going into the 85.

Us the same charger for both, or at least ones with similar characteristics would make this a much better comparison.

Since the 70 kWh battery pack can’t handle as much power as the 85 kWh pack, the charger has to reduce the volts, the amps, or both. Perhaps the Supercharger was giving the 70 as much as it could handle.

So the difference is very small between the two considering the overall stopping time…

9 mins difference for 250km.

The slowdown between 200km to 250km is pretty apparent that lithium ion battery charging curve is the dominant factor here.

Used 85’s are the best deal…. and P85’s.