Is my heating power consumption correct?

[Ian Robinson]

I seem to use less that 1kwh heating for 7kw driving in the winter, does that seem correct this diaply i think can only show 1kwh blocks so all I know is the heating ls 1kwh or less? - I'm getting 3 to 3.5 mile/kw driving steady so there's a 0.5 to 1kwh increase in use over th summer but maybe that's 'lost' because the batteries are cold . Auto battery heating is off. If anyone in the UK can check theirs that woudl be useful, at the mment there appears no benefit turning the heating down (or heating while plugged in) cheers.

 

[gary333]

I seem to use less that 1kwh heating for 7kw driving in the winter, does that seem correct this diaply i think can only show 1kwh blocks so all I know is the heating ls 1kwh or less? - I'm getting 3 to 3.5 mile/kw driving steady so there's a 0.5 to 1kwh increase in use over th summer but maybe that's 'lost' because the batteries are cold . Auto battery heating is off. If anyone in the UK can check theirs that woudl be useful, at the mment there appears no benefit turning the heating down (or heating while plugged in) cheers.

There's no point heating the batteries at all in the UK if that's what you are asking. Well, that is unless you are planning on taking the car straight out on to the race track from your drive, or live next to a motorway and want to gun it to 70mph.

If you mean internal heating of cabin, then more heat equals more power usage, it's a direct correlation as it's simply a heated coil with a fan blowing the "heat" around.

 

[Anon70]

If I start my car from cold with no preheating it takes about 2 - 3 minutes before warm air starts blowing into the cabin. If you assume the heater is going full blast for that time it would use 0.35 kW (7kW per hour and 3 minutes is 1/20th of an hour, so 7/20 = 0.35). The heater would then cycle on and off as required during the journey.

 

[Ian Robinson]

Thanks for the replies, the question is if the display is correct, I'm surprised how little (Or no) energy) the cabin heating uses in the UK winter, according to the display at least.

 

[gary333]

Thanks for the replies, the question is if the display is correct, I'm surprised how little (Or no) energy) the cabin heating uses in the UK winter, according to the display at least.

It still equates to 12.5% of the cars power utilisation for your trip being used to simply heat a small cabin.

 

[Ian Robinson]

It still equates to 12.5% of the cars power utilisation for your trip being used to simply heat a small cabin.

Maybe, ~10% is a lot less than I expected but could be correct. My enegry consumption has increased from ~4mile/kWh to 3 mile/kWh though in the winter, I was expecting most of that would be due to cabin heating but I guess it's something else (cold batteries?)

 

[Ian Robinson]

I asked AI, this is what it says for interest

Summary (Typical Contribution Percentages)​

• Cabin heating: ~40%
• Battery chemistry losses: ~25%
• Battery warming systems: ~15%
• Tyre rolling resistance: ~10%
• Aerodynamic drag increase: ~6%
• Ancillary loads: ~4%
• Reduced regen braking: ~3%

These add up to ~100% total cause of the winter range penalty.

 

[gary333]

Maybe, ~10% is a lot less than I expected but could be correct. My enegry consumption has increased from ~4mile/kwh to 3 mile/kwh though in the winter, I was expecting most of that would be due to cabin heating but I guess its something else (cold batteries?)

I think the energy screen is useless as yesterday and today it’s just showing 1kWh for both heating and drive on mine, even after 10 miles (which is clearly erroneous)

 

[ReintjeWA]

I think the energy screen is useless as yesterday and today it’s just showing 1kWh for both heating and drive on mine, even after 10 miles (which is clearly erroneous)

Yeah I've seen figures that would extrapolate to either a 80 kWh battery pack, or on other occasions a 40 kWh battery pack. It's Trophy so both would be a little off.