Battery Charge Levels

[Kev71B]

I’ve a Born v2. Recently looked at for battery performance. I was getting 190m with 80% charge or 215m with 100%

Worked on 2 miles per 1% driving as a rough guide. Then suddenly dropped to 1.5% per mile. Garage investigated for a period and on handing the car back previous figures were restored. Yet 2 weeks later it’s dropped off again.

What are others getting for normal use (in comfort mode)?

[Baconrage]

I expect about 2 miles per 1% battery and that's roughly what I get. But there are plenty of variables including road type. I.e. on my 30 mile drive to work there is a bit of road just after I go through the next town over where it always feels like 2-3% just disappears, where it probably just caused by breaking and acceleration through sharp turns on a fast road.

[mluisbrown]

As a very rough guide I also have 3km per 1% (same as 2 miles per 1%), but it can vary hugely depending on all kinds of factors. If the weather is cold the range drops significantly, I've seen about a 20% drop in range with temps around 5C compared with driving the same stretch of motorway in 25C weather. Rain can also reduce the range, which seems common to all EVs although I don't quite understand why.

FWIW there is absolutely no discernible difference in range between "comfort" and "range" modes. I did some long range motorway tests with both and noticed zero difference. "Range" mode makes the acceleration to resume the set speed with ACC almost dangerously slow, so I never use it now.

[Shahev]

External temperatures, load, wind, rain and tyre pressures all effect range. But in good conditions I also get 20 miles per 10% or more with wife's heavy 77kwh variant.

[Kev71B]

Thanks folk. I’ll keep monitoring. I charged to 80% last night (+5c) and got 160 predicted range then topped up to 100% which indicated 203m this morning.

I assume others must be getting similar judging by people seeming to use 1% = 2 miles range with normal driving?

[Ponk]

% per mile seems an odd way to monitor consumption, it would really help to use a standard consumption value, like miles per kwh.

With my 77kw, driving on a mix of roads in summer, 100% to 10% (90% used), I would get 243 miles, so that's 2.7 miles per 1%. But my 1% battery size is different from your 1%, because we have a different battery sizes.

2.7 miles per 1% with a 77kwh battery is 2.7 miles per 0.77kwh, or 3.5 miles per kwh.

2 miles per 1% with a 58kwh battery is 2 miles per 0.58kwh, or 3.45 miles per kwh.

Now it's easy to compare, and can say that 3.4 to 3.5 seems very reasonable for the time of year and driving on mixed roads. Expect a bit better when it's warmer, expect a bit better with more stop and start driving.
Expect worse when it's colder, expect worse for motorway driving.

Hope that helps, and hope my maths is correct!

[headwrong]

normal driving?

What's normal driving?

[mluisbrown]

a standard consumption value, like miles per kwh.

Odd that someone living in Switzerland would user miles per kwh and not kW per 100km

I grew up in the UK and was used to MPG, but 20 years living in Portugal and I'm fully converted to l/100km and kW/100km. I get anything from 12kW/100km in gentle city driving up to 21kW/100km in cold weather motorway driving (at 120km/h). In the summer I get 18kW/100km @ 120km/h on motorways which is pretty good.

[Baconrage]

But In practice using miles per % is more practical because its easy to work out how many miles I should expect from whatever % charge is left, just double the percentage! Especially useful as the range in the app is never right!

[Bazzachazza]

No two 1%s will ever be the same though. It’s an impractical way of measuring it. Far too many factors affect it.