I-Pace range

All Jaguar I-Pace related discussions
Jelle v/d Meer
Posts: 800
Joined: Sat Apr 28, 2018 7:43 pm
Location: Tilburg / Netherlands

Re: I-Pace range

Post by Jelle v/d Meer » Mon Mar 04, 2019 12:42 pm

Yesterday I drove 55km from Lipno CZ (ski resort) to Ceske Budejovice, this is a winding regional road with sharp turns and up/down hills that goes through lots of towns. I was having the greatest fun with the I-pace going through corners, overtaking cars like they were standing still while reasonable trying to keep to speed limit of 90km/h and in towns 50km/h.

I was driving sporty (Eco score was like 50%) in comfort mode, 4 people in the car, 10 degrees and low regen so I was really confused to see that I achieved a for me amazing efficiency of 192 watt/km (307 watt/mile).

TripA.png

The same trip back later that evening, now with 5 people and luggage/groceries, 7 degrees with a 70% Eco score resulted in an efficiency of 286 watt/km still decent but not that good.

Still puzzled on that amazing efficency I used Plugsurfing routeplanner and then look at elevation and things become more clear, see below :-).

Elevation.JPG

I-pace S + HUD, Drive Pack, Light Oyster Sport Seats, Elec Tailgate, DAB+ & heated windshield I Ceasium Blue & 18" wheels


mclarenpaul
Posts: 179
Joined: Thu May 24, 2018 8:42 am
Location: Luxembourg

Re: I-Pace range

Post by mclarenpaul » Mon Mar 04, 2019 1:11 pm

Jelle, how did you get on with the charging when travelling through Germany? I'm planning a similar trip in Summer to Prague.


Chewy
Posts: 958
Joined: Tue Nov 06, 2018 5:46 pm
Location: UK

Re: I-Pace range

Post by Chewy » Mon Mar 04, 2019 1:14 pm

Well, I made my way to Leeds today.

4192C053-1529-4615-A810-08A1FB103F34.jpeg

Consumption wasn’t too bad. Arrived with 33% SOC and 91 miles remaining.

I have found the Alfa 100kW Charger :-)

Not charging as fast as advertised by Jaguar :-(

101E8DD6-8159-440D-96BA-765D634BAEEA.jpeg

Caesium Blue S. 250mi range on 18” wheels in the Winter. Hoping for 300 miles range when it warms up. S19A-07, 15.2


SammyD
Posts: 319
Joined: Sat Oct 13, 2018 7:44 pm
Location: N.E Hampshire, UK

Re: I-Pace range

Post by SammyD » Mon Mar 04, 2019 2:08 pm

Chewy wrote:
Mon Mar 04, 2019 1:14 pm
Well, I made my way to Leeds today.

4192C053-1529-4615-A810-08A1FB103F34.jpeg

Consumption wasn’t too bad. Arrived with 33% SOC and 91 miles remaining.

I have found the Alfa 100kW Charger :-)

Not charging as fast as advertised by Jaguar :-(

101E8DD6-8159-440D-96BA-765D634BAEEA.jpeg
At least it is charging unlike a good few other chargers and at more than 50kW
Driving "Hirundo Rustica" since 15th Mar 2019. Lovely Jubbly :D :D


Jelle v/d Meer
Posts: 800
Joined: Sat Apr 28, 2018 7:43 pm
Location: Tilburg / Netherlands

Re: I-Pace range

Post by Jelle v/d Meer » Mon Mar 04, 2019 2:54 pm

mclarenpaul wrote:
Mon Mar 04, 2019 1:11 pm
Jelle, how did you get on with the charging when travelling through Germany? I'm planning a similar trip in Summer to Prague.
See newly created topic “Long trip with I-pace”, to Praque you will likely take a different route, Ionity is construction a few stations in that direction.
I-pace S + HUD, Drive Pack, Light Oyster Sport Seats, Elec Tailgate, DAB+ & heated windshield I Ceasium Blue & 18" wheels


Chewy
Posts: 958
Joined: Tue Nov 06, 2018 5:46 pm
Location: UK

Re: I-Pace range

Post by Chewy » Mon Mar 04, 2019 4:34 pm

SammyD wrote:
Mon Mar 04, 2019 2:08 pm

At least it is charging unlike a good few other chargers and at more than 50kW
Yes, was really easy. Pressed “Start” on the Ap after plugging the car in. No arguments, no try again. Just worked.

It took the car back up to 90% in 50 mins. Plenty for the remainder of the trip and to get me back home. Well pleased. We need Alfa to put more of these in.
Caesium Blue S. 250mi range on 18” wheels in the Winter. Hoping for 300 miles range when it warms up. S19A-07, 15.2


Chewy
Posts: 958
Joined: Tue Nov 06, 2018 5:46 pm
Location: UK

Re: I-Pace range

Post by Chewy » Tue Mar 05, 2019 10:51 pm

Thanks to @Holderone my App is able to connect to my car again :-)

731A0384-CA9C-4B7E-A7C0-CA25AE741556.jpeg

Last edited by Chewy on Fri Mar 15, 2019 12:55 am, edited 2 times in total.
Caesium Blue S. 250mi range on 18” wheels in the Winter. Hoping for 300 miles range when it warms up. S19A-07, 15.2


DougTheMac
Posts: 270
Joined: Mon Sep 17, 2018 7:50 pm
Location: Suffolk UK

Re: I-Pace range

Post by DougTheMac » Thu Mar 14, 2019 11:10 pm

For the first time since I started following these forums, this, the most popular forum topic, has not shown up on the “what’s new” list - what, no new posts for over a week!! So, partly to “bump” this thread back to where it belongs, herewith the following, slightly tongue-in-cheek post...

As a retired mech eng with too much time on my hands, I’m playing with some modelling of the I-Pace range, and have come up with an intriguing and amusing observation. I’m still working on the numbers, but the principle is as follows:

I start with the (perhaps questionable) assumption that what matters most to the driver on a long trip is the A-to-B time.
“Consumption” (as in kW-hr/mile) increases with speed (because of aero drag being proportional to the square of speed).
So, how best to drive?

Consider the simplistic case of starting at A, accelerating to a cruise speed, maintaining that steady speed and then decelerating to a halt at B.
You can either accelerate and decelerate gently or fiercely.
Accelerating gently takes longer to get to the cruise speed, so increases the A-to-B time.
But you could achieve the same A-to-B time if you accelerate fiercely to a LOWER cruise speed. This will reduce the energy consumed in the cruise phase.
IF (big IF) the propulsion system is equally efficient (defined here as energy out / battery kW-hr depletion) at high torque and low torque, then it follows that:

HARD ACCELERATION IMPROVES CONSUMPTION.

Thought you’d like that one!

A lot of caveats, of course.

On a deserted road, this theory probably does apply, but the effect is pretty small over any distance long enough for the time difference to matter.. For instance, on a 10km leg, the difference in required cruise speed between accelerating at 1m/s2 (0-60mph in c27 sec) and 3m/s2 (0-60 in 9s) is 27m/s (60.4mph) to 25.7m/s (57.5mph). (I’ve taken the 1m/s2 case as the standard case and fiddled the cruise speed to give the same A-to-B time at different accelerations). That change in cruise speed will make a few % difference to consumption and hence range.

In practice, your cruise speed will be interrupted by traffic-enforced variations, and there is absolutely no point in accelerating hard when one truck gets out of your way if there is another truck 200m down the road.

However, it may well be worth booting it to pass someone on a single carriageway, and the consumption penalty will be small compared with the possible time saving.

Chewy will doubtless comment…
HSE Silicon Silver Pano Air+AD Oyster since 1Mar19
S18D_18.47.5-269316 & 14.2


sciencegeek
Posts: 164
Joined: Fri Nov 02, 2018 8:14 pm
Location: California

Re: I-Pace range

Post by sciencegeek » Thu Mar 14, 2019 11:44 pm

Sorry to burst your bubble but one of the worst things you can do for EV range is to accelerate fiercely because discharge efficiency from the battery suffers greatly. This is why the drive cycle testing regimen that consistently produces the shortest range of all EVs tested is the so-called US06, which involves repeated acceleration and deceleration:
https://www.aaa.com/AAA/common/AAR/file ... Report.pdf

On a related note, JLR calculates average efficiency incorrectly, such that it underestimates actual power consumed if you drive at both slow speeds and high speeds on a single 'journey', so don't trust the consumption numbers for those types of tests. The only way to calculate correct numbers is to compare SoC in the midrange where it's linear (between ~25% and 80%) to your miles driven (and assuming the likely battery 'capacity', say 82kWh).


Chewy
Posts: 958
Joined: Tue Nov 06, 2018 5:46 pm
Location: UK

Re: I-Pace range

Post by Chewy » Fri Mar 15, 2019 12:34 am

sciencegeek wrote:
Thu Mar 14, 2019 11:44 pm
Sorry to burst your bubble but one of the worst things you can do for EV range is to accelerate fiercely because discharge efficiency from the battery suffers greatly. This is why the drive cycle testing regimen that consistently produces the shortest range of all EVs tested is the so-called US06, which involves repeated acceleration and deceleration:
https://www.aaa.com/AAA/common/AAR/file ... Report.pdf

On a related note, JLR calculates average efficiency incorrectly, such that it underestimates actual power consumed if you drive at both slow speeds and high speeds on a single 'journey', so don't trust the consumption numbers for those types of tests. The only way to calculate correct numbers is to compare SoC in the midrange where it's linear (between ~25% and 80%) to your miles driven (and assuming the likely battery 'capacity', say 82kWh).
Smooth and gentle acceleration. Maintain constant speed where possible. Look ahead and use gentle regen to slow the car down when needed. Try not to come to a complete stop if you can. For extended range, <70mph is best.

The European Drive Cycle is very friendly to EVs. It is basically a collection of gentle accelerations with a lot of steady state speed sections. That will be why the I-Pace gets such a high score with that test. If you can achieve the same mode of driving then you can get similarly good figures.

European Drive Cycle....

CC35524A-BF8C-48D0-9D7C-C0D76DBC586F.jpeg

The Federal FTP75 Drive Cycle is much more demanding, with no steady state....

A2313651-E599-455B-A97C-8AB4BE65C8F3.jpeg

Not sure on the second part of the statement.


This is the range the GOM said I should get when it was fully charged on my home charger before setting off on a long journey...

571B4CAE-B35E-486D-BFC4-C9D1FE92CA15.jpeg

I did 182 miles and consumed a reported 66% from 100% SoC. The car reported I had 91 miles range left with 33% SoC remaining. This was on A Roads and Motorway and some town driving, so a mixture of slow speed and higher speed.

Looking ahead and slowing gently is important so you don’t lose momentum. The 182 miles only generated 3.4kWh. Acceleration is expensive.

450DEB4A-105C-433E-8CCC-C803C988D475.jpeg

This would suggest to me that the GOM has learned how I drive and the the range and usage indicators are very linear and accurate in the figures they report within the car, at least when driving longer distances.
Last edited by Chewy on Fri Mar 15, 2019 12:45 am, edited 2 times in total.
Caesium Blue S. 250mi range on 18” wheels in the Winter. Hoping for 300 miles range when it warms up. S19A-07, 15.2


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