[snerkler]

Originally Posted by NomoTesla

Being on time is a very European (and Japanese) concern.

Doesn’t seem to be in the UK if our public transport is anything to go by

[thebishman]

Originally Posted by snerkler

So the charge worked overnight and was finished by 5.10am so an hour earlier than anticipated.

It's charged to 80% but only showing 181 miles range. I assume this is adaptive as I've only been getting an average of 1.5 miles/kW since it was last charged and it will show a longer range when I start doing some longer runs? (been doing a lot of short runs and heating the car every morning)

It’s pretty cold in the UK at the moment, and as you say you’re driving short distances which is inefficient as the car is heating the battery and the cabin multiple times.

Try to set a time for departure, (if that doesn’t interfere with the presets for cheap(er) electricity under a Time Of Use plan if you’re using one), or use the app to Pre-condition the cabin whilst hooked up to ‘Shore’ power.

Also, once you start driving longer distances and the weather starts getting better, your miles/kWhr will markedly improve.

[snerkler]

Originally Posted by thebishman

It’s pretty cold in the UK at the moment, and as you say you’re driving short distances which is inefficient as the car is heating the battery and the cabin multiple times.

Try to set a time for departure, (if that doesn’t interfere with the presets for cheap(er) electricity under a Time Of Use plan if you’re using one), or use the app to Pre-condition the cabin whilst hooked up to ‘Shore’ power.

Also, once you start driving longer distances and the weather starts getting better, your miles/kWhr will markedly improve.

Yeah I knew that I'd get better range in the warmer weather, it was just the estimated range after a charge has gone down too so I'm assuming the estimated range is adaptive and when I start getting more miles/kW then the estimated range following a charge will also go up.

Unfortunately I won't be able to preheat the car whilst being hooked up to a charger as I'll be getting cheap rates between 11.30pm and 5.30am and I don't leave the house until 8.45am. Also, I'll probably only have the car on charge once every fortnight.

TBH the range doesn't bother me 99% of the time, I'm just learning about it all as I like to understand how things work

[LuisBoston]

Originally Posted by snerkler

Yeah I knew that I'd get better range in the warmer weather, it was just the estimated range after a charge has gone down too so I'm assuming the estimated range is adaptive and when I start getting more miles/kW then the estimated range following a charge will also go up.

Unfortunately I won't be able to preheat the car whilst being hooked up to a charger as I'll be getting cheap rates between 11.30pm and 5.30am and I don't leave the house until 8.45am. Also, I'll probably only have the car on charge once every fortnight.

TBH the range doesn't bother me 99% of the time, I'm just learning about it all as I like to understand how things work

How far is your drive at 8:45? If it’s short, it may be more inefficient to preheat the car anyway.

[snerkler]

Originally Posted by LuisBoston

How far is your drive at 8:45? If it’s short, it may be more inefficient to preheat the car anyway.

10 mins max, however comfort is more important than efficiency

The only time I'll be concerned about range is the 2 or 3 times/year I go away but as long as I can get 250 miles without having to stop for a charge that'll be fine. I've seen that a number of people have said they get 280-300 miles in the real world so I should be good. Also, when I go on a longer drive I'll have the car in efficiency mode

[LuisBoston]

Originally Posted by snerkler

10 mins max, however comfort is more important than efficiency

The only time I'll be concerned about range is the 2 or 3 times/year I go away but as long as I can get 250 miles without having to stop for a charge that'll be fine. I've seen that a number of people have said they get 280-300 miles in the real world so I should be good. Also, when I go on a longer drive I'll have the car in efficiency mode

So how long do you warm it up for? The seats/cabin heats pretty quickly.

In cold weather, preconditioning the battery is necessary to attain longer range. For example, you won’t see 300 miles of range in 20F weather. Probably not even with preconditioning. But a quick 10 min DC charge in the right spot will get you there.

[snerkler]

Originally Posted by LuisBoston

So how long do you warm it up for? The seats/cabin heats pretty quickly.

In cold weather, preconditioning the battery is necessary to attain longer range. For example, you won’t see 300 miles of range in 20F weather. Probably not even with preconditioning. But a quick 10 min DC charge in the right spot will get you there.

I usually set the departure time and the car warms itself up so I don't know how long it chooses to set the warming function for.

Yeah I don't expect 300 miles in 0°C and lower, not even 10°C and lower, but I'm hoping that I'll get close to 300 miles when it warms up to 15°C and above.

[snerkler]

Later this year I will be travelling to an airport which is 175 miles away so it is highly unlikely that I will get there and back on a single charge therefore I plan on charging it jsut before I get to the airport as I don't want to charge it when I return as it will be late and I'll just want to get home as quickly as possible.

I was planning on charging to 100% just to make sure I have enough range in case of delays, detours etc, will it do any harm charging the car to 100% and then leaving it for 4 days? In the manual it says "For higher charging targets (meaning over 80%) recharge the high voltage battery only shortly before your planned departure if possible", but it only says if possible not that it's a must

It then goes on to say "For stationary periods of less than 6 months, park the vehicle with a state of charge between 30% and 50%", however it does not say how long a 'stationary period' is

[exxxviii]

Originally Posted by snerkler

Later this year I will be travelling to an airport which is 175 miles away so it is highly unlikely that I will get there and back on a single charge therefore I plan on charging it jsut before I get to the airport as I don't want to charge it when I return as it will be late and I'll just want to get home as quickly as possible.

I was planning on charging to 100% just to make sure I have enough range in case of delays, detours etc, will it do any harm charging the car to 100% and then leaving it for 4 days? In the manual it says "For higher charging targets (meaning over 80%) recharge the high voltage battery only shortly before your planned departure if possible", but it only says if possible not that it's a must

It then goes on to say "For stationary periods of less than 6 months, park the vehicle with a state of charge between 30% and 50%", however it does not say how long a 'stationary period' is

I would charge it to 90%. That leaves you buffer for battery health and more than enough range for the return.

The other factor to consider is that it takes a freakin' lifetime to charge past 80% on a DCFC. And that 90% to 100% segment is insanely slow.

[snerkler]

Originally Posted by exxxviii

I would charge it to 90%. That leaves you buffer for battery health and more than enough range for the return.

The other factor to consider is that it takes a freakin' lifetime to charge past 80% on a DCFC. And that 90% to 100% segment is insanely slow.

Oh, I didn't realise that, maybe I'll just charge it to 80% then.

I've not done a 'run' in the car yet and I'm only getting 1.4 miles/kWh and at that rate 80% wouldn't get me home. However, I am expecting the range to be much better as currently I'm only doing 2 miles 'hops' and pre-heating the car in a morning as it's been -2 to 0° C.

[exxxviii]

Originally Posted by snerkler

Oh, I didn't realise that, maybe I'll just charge it to 80% then.

I've not done a 'run' in the car yet and I'm only getting 1.4 miles/kWh and at that rate 80% wouldn't get me home. However, I am expecting the range to be much better as currently I'm only doing 2 miles 'hops' and pre-heating the car in a morning as it's been -2 to 0° C.

Yeah, I did the quick math and you would need a little better than 2 miles/kWh to do 175 miles on 80% charge. You should do way better than that at 0° C.

[snerkler]

Originally Posted by exxxviii

Yeah, I did the quick math and you would need a little better than 2 miles/kWh to do 175 miles on 80% charge. You should do way better than that at 0° C.

Yeah, and that's if I take it to 0%. Before I bought the car I did my research and I saw that people were getting 280-300miles in good weather on 100% charge, so on 80% I should get 224-240 miles based on that.

I do hope that I can do over 250 miles with room to spare when doing a long run in decent temps otherwise it's going to prove to be a royal PITA.

[LuisBoston]

Originally Posted by exxxviii

I would charge it to 90%. That leaves you buffer for battery health and more than enough range for the return.

The other factor to consider is that it takes a freakin' lifetime to charge past 80% on a DCFC. And that 90% to 100% segment is insanely slow.

On a DCFC I typically will be in the 50-80 kw range past 90% SoC. It’s not insanely slow. Insanely slow is 15-20 kw, which my old EV pulled past 90% and other EVs sitting at the chargers are pulling. The iX is much faster.

That being said, I have waited at 99% for it to finish just to see how long it will take and it’s like it never ends - in that I’ve waited to get to 100% / “charging complete” - but it never did - it just kept going.

On L2 I’ve charged to 100% several times, when I’ve had long trips and did not want to stop.

I’m not worried about battery issues. The capacity is limited anyway below its physical capacity, so BMW already takes a conservative approach with these batteries.

If leaving it for 4 days and need max range when I return, I’d just set it to 95%.

[ggalanis]

Originally Posted by snerkler

Later this year I will be travelling to an airport which is 175 miles away so it is highly unlikely that I will get there and back on a single charge therefore I plan on charging it jsut before I get to the airport as I don't want to charge it when I return as it will be late and I'll just want to get home as quickly as possible.

I was planning on charging to 100% just to make sure I have enough range in case of delays, detours etc, will it do any harm charging the car to 100% and then leaving it for 4 days? In the manual it says "For higher charging targets (meaning over 80%) recharge the high voltage battery only shortly before your planned departure if possible", but it only says if possible not that it's a must

It then goes on to say "For stationary periods of less than 6 months, park the vehicle with a state of charge between 30% and 50%", however it does not say how long a 'stationary period' is

Leaving it charged at or near 100% is particularly bad for the battery if it is very hot. That said, lets be honest here, doing it once for 4 days will not cause a noticeable effect, but doing it constantly over time will.

If you want to do what's best for the battery, then set it to something lower than 100 as others are recommending as well.

I just did a quick check in ABRP making assumptions about where you are going and it estimates you'd need about 70% of your SoC to make it back (or a bit more to save like 3 minutes) and that is right now (it factors seasonal temps in the estimate). So if your trip is not going to be on an unusually cold day, you should be fine with about 90% leaving you a 20 ish% buffer.

[NomoTesla]

I'm quite pleased with the DCFC performance above 90%. My Model S would take less than 19 kW at 90%. I find that I'm in and out of the charge stations faster than those around me. I think the iX charges beautifully.

[snerkler]

Originally Posted by ggalanis

Leaving it charged at or near 100% is particularly bad for the battery if it is very hot. That said, lets be honest here, doing it once for 4 days will not cause a noticeable effect, but doing it constantly over time will.

If you want to do what's best for the battery, then set it to something lower than 100 as others are recommending as well.

I just did a quick check in ABRP making assumptions about where you are going and it estimates you'd need about 70% of your SoC to make it back (or a bit more to save like 3 minutes) and that is right now (it factors seasonal temps in the estimate). So if your trip is not going to be on an unusually cold day, you should be fine with about 90% leaving you a 20 ish% buffer.

Thanks, hopefully I'll start to see the mileage I'm expecting and I'll be confident 'only' charging to 90% or something

[exxxviii]

Originally Posted by snerkler

Thanks, hopefully I'll start to see the mileage I'm expecting and I'll be confident 'only' charging to 90% or something

The good part is that you will see your efficiency on the way over, and your return would likely be similar. I am guessing you will see something in the ~2.4 miles/kWh range, unless you drive like a maniac.

[snerkler]

Originally Posted by exxxviii

The good part is that you will see your efficiency on the way over, and your return would likely be similar. I am guessing you will see something in the ~2.4 miles/kWh range, unless you drive like a maniac.

Thanks, I'll be doing some runs before that one to get some idea of efficiency. I've done my research so the range should be ample, I'm just concerned with getting so low at the moment that something may not be right with my car. I do think it's just a case of short trips, cold weather, and preheating the cabin all the time.

[BrettKA7]

Originally Posted by NomoTesla

Per BMW's owner's manual, AC is preferred over DC as well as charging to a high SOC prior to departure versus letting the car sit. I keep mine charged to 50% for my daily driving needs. I rarely drive more than 100 miles in a day so that's plenty. Also, shorter charge cycles are better than long charge cycles. IOW I plug-in opportunistically and charge in under 5% increments usually. MUCH healthier for the battery to do 10x 5% charges than a 1x 50% charge.

Due to the need for AC-to-DC conversion, AC charging incurs some additional losses that DC charging does not. However, DC charging also likely activates the car's behemoth cooling system, which takes a chunk of power and also impacts efficiency. Not sure how the numbers pencil out on that.

I worked at Tesla for 8 years and worked directly with many battery engineers. Obviously, BMW isn’t using the exact same tech as Tesla but I have to imagine some of it translates.

They always told me the absolute best thing you could possibly do for battery health is to do 60-40-60-40-60% cycles for daily driving, but it’s also the absolute worst thing you can do for battery calibration. When you keep it in the 40-70% range all the time, you’ll frequently find yourself parking the car at 190 miles of range and when you come back, it’s at 175 miles of range despite losing no actual charge.

[Paladin1]

Originally Posted by NomoTesla

Being on time is a very European (and Japanese) concern.

Not in Spain! Living there for a half-decade, I learned the true meaning of mañana (hint - not what's in the Spanish/English dictionary: "tomorrow"). The true meaning is "not today." I actually came to like and admire their attitude about life in general.

[snerkler]

Originally Posted by exxxviii

The good part is that you will see your efficiency on the way over, and your return would likely be similar. I am guessing you will see something in the ~2.4 miles/kWh range, unless you drive like a maniac.

I've just discovered something 'interesting'. I normally drive in the personal driving mode and today when I was cruising at 30mph on a pretty level street the car was showing 1.9 miles/kWh, however when I switched to efficiency mode this suddenly jumped to 2.9. I tried this numerous times and efficiency mode consistently gave me 1-2.5 miles/kWh more.

Now I would expect efficiency to give me more range overall as you're not accelerating as hard etc, however what I didn't expect was that it would improve efficiency when you're on a constant throttle at a constant speed, and I can't work out why that would be. In my mind if you're at a constant speed on a constant throttle it shouldn't matter what mode you're in as you're using the same amount of power

I know efficiency puts climate into an efficient mode, and turns off seat massage (which I don't use anyway) but I wouldn't have expected it to make such a difference. Air cons was off, seat and steering wheel heating was off, and temp was only set to 17°C.

Anyway, I found it interesting

[ggalanis]

Originally Posted by snerkler

I've just discovered something 'interesting'. I normally drive in the personal driving mode and today when I was cruising at 30mph on a pretty level street the car was showing 1.9 miles/kWh, however when I switched to efficiency mode this suddenly jumped to 2.9. I tried this numerous times and efficiency mode consistently gave me 1-2.5 miles/kWh more.

Now I would expect efficiency to give me more range overall as you're not accelerating as hard etc, however what I didn't expect was that it would improve efficiency when you're on a constant throttle at a constant speed, and I can't work out why that would be. In my mind if you're at a constant speed on a constant throttle it shouldn't matter what mode you're in as you're using the same amount of power

I know efficiency puts climate into an efficient mode, and turns off seat massage (which I don't use anyway) but I wouldn't have expected it to make such a difference. Air cons was off, seat and steering wheel heating was off, and temp was only set to 17°C.

Anyway, I found it interesting

what was the outside temp?