Does anyone understand WLTP maths???

[michaelgaunt]

Does anyone understand WLTP maths???

Battery size: 44.5

WLTP combined: Kw/100 = 18.6; Miles/kw 3.3

So the range by that calculation is: (44.5/18.6)*100= 239km, or 3.3*44.5 = 147 miles

But WLTP range is 263km / 163 miles

#confused

 

[Tim Green]

Maybe an allowance for Regen?

 

[teepee]

Only 42.5 usable kw too?

 

[Chrispydoc]

I wish I was good at maths........or spelling.....

 

[Gomev]

Does anyone understand WLTP maths???

Battery size: 44.5

WLTP combined: Kw/100 = 18.6; Miles/kw 3.3

So the range by that calculation is: (44.5/18.6)*100= 239km, or 3.3*44.5 = 147 miles

But WLTP range is 263km / 163 miles

#confused

It's not a calculation, it's a test.

WLTP for electric cars

Learn what WLTP stands for and what distinguishes the process

www.mobilityhouse.com

 

[michaelgaunt]

It's not a calculation, it's a test.

WLTP for electric cars

Learn what WLTP stands for and what distinguishes the process

www.mobilityhouse.com

Even if it is a test then the results are internally inconsistent. The test cant show 3.3m/kw as the WLTP figure and 163 miles as the WLTP figure.

 

[michaelgaunt]

WLTP range and efficiency of electric cars - PushEVs says: “Remember that like EPA, WLTP figures also measure plug-to-wheels consumption, this means that the on-board charger efficiency matters.”

Maybe this helps.

 

[JodyS21]

I did figure this all out, can't remember where I posted it though.
It did add up though.......

Have you got the link that shows those official figures, maybe if I see it again I'll remember

 

[michaelgaunt]

Here

I did figure this all out, can't remember where I posted it though.
It did add up though.......

Have you got the link that shows those official figures, maybe if I see it again I'll remember

I’m sure it does make sense somehow, although I don’t understand why it is not as simple as a x b = c

here’s the link to the nz spec car which is the same as the exclusive I think.

Link here: https://files.digitaldealer.com.au/mgmotor/specifications/zsev.pdf .


this is where I saw the comparative figures: WLTP range and efficiency of electric cars - PushEVs

 

[JodyS21]

I remember now.

"Powered by a 44.5kWh, water-cooled lithium-ion battery, you can enjoy a driving range of up to 163 miles from a single charge* on the WLTP combined cycle.
*from a single charge on the WLTP combined cycle: Combined Range: 163 miles (263 km); City Range: 231 miles (372 km); Combined Driving Efficiency: 3.3 miles/kWh (18.6 kWh/100km)."

The driving efficiency for the WLTP is measured on the AC input power used to recharge the battery, not the power depleted from the battery. The onboard AC to DC charger efficiency is not great.

163 @ 44.5kwh = 3.66m/kwh
163 @ 42.5kwh = 3.84m/kwh

3.3m/kwh @ 163miles = 49.39kwh (Net AC input power)

 

[michaelgaunt]

I remember now.

"Powered by a 44.5kWh, water-cooled lithium-ion battery, you can enjoy a driving range of up to 163 miles from a single charge* on the WLTP combined cycle.
*from a single charge on the WLTP combined cycle: Combined Range: 163 miles (263 km); City Range: 231 miles (372 km); Combined Driving Efficiency: 3.3 miles/kWh (18.6 kWh/100km)."

The driving efficiency for the WLTP is measured on the AC input power used to recharge the battery, not the power depleted from the battery. The onboard AC to DC charger efficiency is not great.

163 @ 44.5kwh = 3.66m/kwh
163 @ 42.5kwh = 3.84m/kwh

3.3m/kwh @ 163miles = 49.39kwh (Net AC input power)

Thank you! i suppose that makes sense.

i presume the in car gauges measure energy depleted from the batteries.

So the target from the on board usage is 3.84m/kw, 6.14km/kw or 16.27kw/100km at 42.5 useable.

That’s better than we are getting where we have an average of 17.6 or so in normal usage, mostly country driving.