Details about power consumption of options? - Jaguar I-Pace EV400 Forum
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post #1 of 11 (permalink) Old 05-07-2019, 03:05 PM Thread Starter
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Details about power consumption of options?

I don't own an I-Pace yet, but planning to buy one this summer. Is there a way, with on-board or after-market accessories, to measure energy consumption of optional systems? I am very interested in how much "fuel" is consumed by using seat heaters, interior heat, sensors, etc.
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post #2 of 11 (permalink) Old 05-07-2019, 04:07 PM
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I don't believe there is an in-built menu that shows the actual power consumption of various sub-systems, but there is a screen called "range impact" which shows the affect of various systems on the range of the vehicle. See attached pic for reference. It is not super-comprehensive but shows a few items like AC, seat/steering wheel heater, etc. that the driver can easily turn on and off.
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post #3 of 11 (permalink) Old 05-08-2019, 12:46 AM
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Hi Snowy Owl, welcome. In addition to the aforementioned range impact screen, you can also just turn on the consumer in question and see the estimated range drop. For example, on a 80 degree day, my range will drop from 105 to 100 miles when I turn on the AC (I don't remember if these numbers are precisely accurate). It assumes that you'll keep the AC on for the duration. The percentage drop in range is the percentage of power it consumes.
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post #4 of 11 (permalink) Old 05-08-2019, 12:52 AM
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P.s.:there's a thread somewhere on this forum where the range impact of heated seats vs forced air is debated. To sum all of this up, the order in which stuff matters for energy consumption is approximately:

0. Outside temperature
1. Speed
2. Aggressiveness of driving
3. Hills (but you get it back on the way down)
4. Headwind
5. Heater (obviously varies in importance w/ outside temp)
6. AC
7. Heated seats

I don't think anything else matters much .. if it does it's extremely minor in comparison to these important consumers. Am I missing anything?
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post #5 of 11 (permalink) Old 05-08-2019, 01:48 AM
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P.s.:there's a thread somewhere on this forum where the range impact of heated seats vs forced air is debated. To sum all of this up, the order in which stuff matters for energy consumption is approximately:

0. Outside temperature
1. Speed
2. Aggressiveness of driving
3. Hills (but you get it back on the way down)
4. Headwind
5. Heater (obviously varies in importance w/ outside temp)
6. AC
7. Heated seats

I don't think anything else matters much .. if it does it's extremely minor in comparison to these important consumers. Am I missing anything?
The items in the 'Range Impact' screen are the accessories with the biggest energy use. Surprisingly, the heated steering wheel has a higher draw than the heated seats. Unsurprisingly, the cooled seats seem to use less than heated. The heated windshield & rear window defrost use about as much as the heated steering wheel. ECO mode reduces the energy consumption of the HVAC. Lastly, a strong crosswind seemes to be as much of a range killer as a headwind
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post #6 of 11 (permalink) Old 05-08-2019, 09:15 AM
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That's very interesting about the heated wheel using more than seats - I must check that out as I LOVE the heated steering wheel. Even so, in ECO mode it only stays on a for a few minutes.

I read somewhere that the heated seats were a better bet than heating the whole cabin, another thing I'll have to check. It's less of an issue when taking a long trip because I'll have the car preconditioning while plugged into the charger. I set it at 25C (about 77F) then turn the heat down to 21C when I get in.

I wish I could set the heated steering to be part of pre-conditioning!
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post #7 of 11 (permalink) Old 05-12-2019, 03:34 AM Thread Starter
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Thanks for these responses. It looks like the built-in interface will answer many of my questions about impact of optional systems on fuel consumption and predicted range. I'm looking forward to becoming an i-pace owner! :-)
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post #8 of 11 (permalink) Old 05-12-2019, 11:54 AM
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Anyone know of a way to predict the drop in range for climb in altitude?
Living in Colorado and traveling in the mountains the consumption changes.
I see that EV route planner A Better Route Planner gives altitude info in account when planning.
Some increase consumption per 1000 ft. altitude gain would be helpful to know before starting a trip.

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post #9 of 11 (permalink) Old 05-12-2019, 12:15 PM
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Energy required for lifting = U = mgh
U is potential energy [Joules]
m is mass of vehicle [kg]
g is gravity [meters/seconds^2]
h is height [meters]

Weight of iPace [kg] 2,169.99
Weight of cargo [kg] 100.00
Meters in 1000 ft 304.80 [simple conversion]
Gravity [m/s^2] 9.81
Joules required 6,787,465.31
kWh required per 1000ft 1.89 [simple conversion from Joules]

feet kWh
1000 1.9
2000 3.8
3000 5.7
4000 7.5
5000 9.4
6000 11.3
7000 13.2
8000 15.1
9000 17.0

You get most of it back on the way down
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post #10 of 11 (permalink) Old 05-12-2019, 04:11 PM
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But since the I-Pace only gives energy in miles, I figured about 5.25 miles per 1000 ft.
of elevation. My gut feeling is it is slightly higher.

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