Tips for extending battery when down to 20%

[taycanstuff]

Hi All,

Have had issues charging, not sure if its the charger or the car, anyway ended up with less then 20% charge.
Any tips to extend the range - I thought, turn off all the following:
heated seats and steering wheel
satnav directions
aircon.
auto lights and auto wipers.
Turn off Music
Not sure if can turn off the PCM - maybe put it onto data screen so uses less electricty
massage seats

Anything else to make it last?

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[daveo4EV]

Hi All,

Have had issues charging, not sure if its the charger or the car, anyway ended up with less then 20% charge.
Any tips to extend the range - I thought, turn off all the following:
heated seats and steering wheel
satnav directions
aircon.
auto lights and auto wipers.
Turn off Music
Not sure if can turn off the PCM - maybe put it onto data screen so uses less electricty
massage seats

Anything else to make it last?

drive slower - all of that stuff is inconsequential vs the drive motors and the power over come aero dynamic drag that ver 40 mph

 

[taycanstuff]

drive slower

Good point - trying to get destination quicker is counter-produtive - is 50mph the best combination of speed and efficiency.

 

[daveo4EV]

Good point - trying to get destination quicker is counter-produtive - is 50mph the best combination of speed and efficiency.

50 mph or less

 

[PrudentOcean]

Cabin heating will use a heat pump to scavenge waste heat from the battery and motor, so that can be more efficient than the resistive heating of the seats and steering wheel.

 

[Barry41561]

Cabin heating will use a heat pump to scavenge waste heat from the battery and motor, so that can be more efficient than the resistive heating of the seats and steering wheel.

That's very interesting - I had 'always' thought that using the heated seats was more efficient for battery use than using the heater. Do we have any evidence of the difference between the two?

Thanks for bringing this up!

 

[Nikon]

I have noticed that when the air condition is ON, the remaining kilometers are less by about 35 kilometers when the A/C is off

 

[tmrqs]

Cabin heating will use a heat pump to scavenge waste heat from the battery and motor, so that can be more efficient than the resistive heating of the seats and steering wheel.

I've always read/heard otherwise.
Would you have a link/source for this?

 

[PrudentOcean]

From Google:

Compared to a resistive heater, an EV heat pump is significantly more energy efficient, meaning it uses much less electricity to produce the same amount of heat, thereby extending the electric vehicle's range, especially in moderate climates; however, a resistive heater might be more effective in extremely cold temperatures where a heat pump's efficiency drops considerably. [1, 2, 3]

Key points about the comparison: [2, 4, 5]

• Efficiency: Heat pumps can generate 2-4 units of heat for every 1 unit of electricity used, while a resistive heater only produces 1 unit of heat per unit of electricity. [2, 4, 5]
• How they work: A heat pump extracts heat from the surrounding air (even when it's cold) and transfers it to the cabin, while a resistive heater directly converts electricity into heat through resistance. [2, 4, 6]
• Impact on range: Using a heat pump in an EV can considerably improve range compared to a resistive heater, especially in milder climates. [1, 2, 3]
• Temperature limitations: While a resistive heater provides consistent heat regardless of the outside temperature, a heat pump becomes less efficient in very cold conditions. [2, 3, 7]

Generative AI is experimental.
[1] https://www.energy.gov/energysaver/electric-resistance-heating
[2] https://www.recurrentauto.com/research/heat-pumps
[3] https://www.edmunds.com/electric-car/articles/heaters-in-electric-cars-how-do-they-work.html
[4] https://www.arrow.com/en/research-a...echnology-transforms-home-heating-and-cooling
[5] https://www.ezacandheat.com/heat-pumps-vs-resistive-heaters-which-is-more-efficient/
[6] https://www.kia.com/uk/about/news/what-is-a-heat-pump-and-how-do-they-work/
[7] https://www.tripletheating.com/blog/6-advantages-disadvantages-of-heat-pumps/

One thing to note is that the heat pump in the Macan can scavenge heat from the motors and battery, so it is less dependent on the temperature of the outside air and should work even in extreme cold. Living in California I have no way to test that myself.

 

[gw5815]

I’ve owned multiple EVs and used to obsess over what things I could turn off to extend range, but as someone said earlier in this thread, speed has more impact (way more) than anything else you can do. There are various charts you can find that show that the peak efficiency for most EVs is around 25-35MPH. Obviously that’s not always practical but at least it gives you an idea of how far you can take it.

Slowing from 75 to 65 will likely have way more range impact than everything mentioned above. So, on the rare occasions where I was stretching the range to make the next charging stop, I’d just slow down a bit and leave the climate on like nothing was happening. It feels counterintuitive though because you’re making the leg of the trip a little longer.

Drag is the velocity squared. Check this out https://saxton.org/tom_saxton/2010/06/ev-range-and-charge.html

Greg

 

[tmrqs]

From Google:

Compared to a resistive heater, an EV heat pump is significantly more energy efficient, meaning it uses much less electricity to produce the same amount of heat, thereby extending the electric vehicle's range, especially in moderate climates; however, a resistive heater might be more effective in extremely cold temperatures where a heat pump's efficiency drops considerably. [1, 2, 3]

Key points about the comparison: [2, 4, 5]

• Efficiency: Heat pumps can generate 2-4 units of heat for every 1 unit of electricity used, while a resistive heater only produces 1 unit of heat per unit of electricity. [2, 4, 5]
• How they work: A heat pump extracts heat from the surrounding air (even when it's cold) and transfers it to the cabin, while a resistive heater directly converts electricity into heat through resistance. [2, 4, 6]
• Impact on range: Using a heat pump in an EV can considerably improve range compared to a resistive heater, especially in milder climates. [1, 2, 3]
• Temperature limitations: While a resistive heater provides consistent heat regardless of the outside temperature, a heat pump becomes less efficient in very cold conditions. [2, 3, 7]

Generative AI is experimental.
[1] https://www.energy.gov/energysaver/electric-resistance-heating
[2] https://www.recurrentauto.com/research/heat-pumps
[3] https://www.edmunds.com/electric-car/articles/heaters-in-electric-cars-how-do-they-work.html
[4] https://www.arrow.com/en/research-a...echnology-transforms-home-heating-and-cooling
[5] https://www.ezacandheat.com/heat-pumps-vs-resistive-heaters-which-is-more-efficient/
[6] https://www.kia.com/uk/about/news/what-is-a-heat-pump-and-how-do-they-work/
[7] https://www.tripletheating.com/blog/6-advantages-disadvantages-of-heat-pumps/

One thing to note is that the heat pump in the Macan can scavenge heat from the motors and battery, so it is less dependent on the temperature of the outside air and should work even in extreme cold. Living in California I have no way to test that myself.

Mmmm it seems there is some confusion here.

Some EV don't have heat pumps (although less and less frequent) and use a resistive heater to warm the car through the vents.
Most EV nowadays have heat pumps and that is more efficient - still using the vents. Some of these cars also have a resistive option, that only kicks in when it's really (really) cold outside.

But as such, at any given temperature, the user cannot choose to use resistive or heat pump when they want warm/hot air to be blown into the car.
The car will do what it can based on a) its equipment and potentially b) the outside temperature.

The absolute most efficient way to warm the driver/passengers however is not through the vents but through the heated seats/steering wheel. Yes, these are also resistive heaters but extremely fast to heat and have a very low consumption.

To sum up, for worst to best in terms of efficiency:
Resistive heating (vent) < Heat pump heating (vent) < Heated seats

And for the first 2, users don't get to choose what is used.

 

[PrudentOcean]

The numbers I see for energy consumption for seat warmers are between 10 and 50 watts per seat.

I would use the seat warmer for the first few minutes while also turning on cabin heat, and then turn the seat warmer off (especially if you have multiple occupants and seat warmers in the rear).

Ultimately occupant comfort is more important to me than maximum range however, so if someone wants to keep their butt warmed that’s fine with me.

 

[cottony]

Wait you guys don’t have a BYOJ (bring your own jacket) rule?

 

[Awaz]

I would use the seat warmer for the first few minutes while also turning on cabin heat, and then turn the seat warmer off

This is exactly what I like to do. Otherwise, warmer seat for longer becomes unnatural and uncomfortable, for me.

 

[DavidL]

Heating off ....... Even turning it down saves quite a few miles/kms

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