EV range

forgotmyname

MouldyOldDough said:

So at what speed is an EV range determined ?
IC cars are most efficient at 56 mph (in  top gear)

Wrong, most cars are not the most efficient at 56mph in top gear.  Some cars are geared so highly that performance

and efficiency maybe really poor at 56mph in top gear.

One car I kept a record of all the fuel used and tracked its fuel usage over 5 years, most efficient was a steady 40mph
in 4th gear which averaged more than 68mpg.

Most efficient speed is usually where the peak torque is unless there is a large excess of torque.

[Deleted User]

forgotmyname said:

MouldyOldDough said:

So at what speed is an EV range determined ?
IC cars are most efficient at 56 mph (in  top gear)

Wrong, most cars are not the most efficient at 56mph in top gear.  Some cars are geared so highly that performance

and efficiency maybe really poor at 56mph in top gear.

One car I kept a record of all the fuel used and tracked its fuel usage over 5 years, most efficient was a steady 40mph
in 4th gear which averaged more than 68mpg.

Most efficient speed is usually where the peak torque is unless there is a large excess of torque.

Agreed, this is only a small sample of cars but it shows that best MPG can vary from 40mph - 70mph



It is likely with EV's that the sweet spot is a lot lower though, here's an example from Tesla, I've looked at some other EV's and it seems to be around 20-40 mph for max efficiency.

[Deleted User]

tberry6686 said:

MouldyOldDough said:

So at what speed is an EV range determined ?
IC cars are most efficient at 56 mph (in  top gear)

My IC cars are not most efficient at 56mph.  My diesel is actually best around 70 (motorway mile muncher) and my petrol is better at 80mph.  56mph is just the standard speed they are tested at.

I very much doubt that. What car do you have that is most efficient at 80mph?

Car_54

Petriix said:

I've managed to push my standard range MG5 to over 250 miles despite having a WLTP range of under 220. That involved sticking below 65mph and patiently following high vehicles in perfect conditions. On the other hand, I've seen below 150 miles when driving fast in the cold, wind and rain.

At 65 mph, the safe following distance "in perfect conditions" is about 60 metres. Does following a high vehicle at that distance really help?

[Deleted User]

Car_54 said:

Petriix said:

I've managed to push my standard range MG5 to over 250 miles despite having a WLTP range of under 220. That involved sticking below 65mph and patiently following high vehicles in perfect conditions. On the other hand, I've seen below 150 miles when driving fast in the cold, wind and rain.

At 65 mph, the safe following distance "in perfect conditions" is about 60 metres. Does following a high vehicle at that distance really help?

We’ve been through all this time and time again. Please go and read the EV bashing thread. 

Car_54

Deleted_User said:

Car_54 said:

Petriix said:

I've managed to push my standard range MG5 to over 250 miles despite having a WLTP range of under 220. That involved sticking below 65mph and patiently following high vehicles in perfect conditions. On the other hand, I've seen below 150 miles when driving fast in the cold, wind and rain.

At 65 mph, the safe following distance "in perfect conditions" is about 60 metres. Does following a high vehicle at that distance really help?

We’ve been through all this time and time again. Please go and read the EV bashing thread. 

With 473 posts, and no quality control? I think not.

MouldyOldDough

forgotmyname said:

MouldyOldDough said:

So at what speed is an EV range determined ?
IC cars are most efficient at 56 mph (in  top gea) 

Wrong, most cars are not the most efficient at 56mph in top gear.  Some cars are geared so highly that performance

and efficiency maybe really poor at 56mph in top gear.

One car I kept a record of all the fuel used and tracked its fuel usage over 5 years, most efficient was a steady 40mph
in 4th gear which averaged more than 68mpg.

Most efficient speed is usually where the peak torque is unless there is a large excess of torque.

Like a modern lightweight small engined turbo car? 

iwb100

Petriix said:

It's actually a totally valid question, and one which people should fully understand before choosing an EV. The real answer is that an EV doesn't 'have a range' at all. The quoted 'range' is usually the WLTP result, but there's also the 'GOM' (Guess'o'meter) range displayed in the vehicle itself which is can be highly misleading. 

Actual range varies massively depending on factors including speed, journey type, driving style, temperature and weather conditions.

A typical EV is actually most efficient at somewhere between 15 and 30 mph and, in ideal conditions with the HVAC off, it's possible to vastly exceed the WLTP range.

I've managed to push my standard range MG5 to over 250 miles despite having a WLTP range of under 220. That involved sticking below 65mph and patiently following high vehicles in perfect conditions. On the other hand, I've seen below 150 miles when driving fast in the cold, wind and rain.

Most of the time, range is unimportant because most journeys are short. However, on long journeys you soon learn to optimise your speed to achieve a balance between making progress and minimising charging stops. 

I did a 336 mile journey both ways over the bank holiday. In an ICE. I stopped once each way. I didn’t need to refuel so each time the stop was thirty minutes to get the kids fed and toileted then back in the car. In each stop I noted that all chargers were being used. I also noted some of them were blocked by cars but were actually out of action. The charging points caused the car parks to back up unnecessarily as people jostled for the chargers.

I keep coming back to the basic infrastructure problem. The roads over the bank holiday were busy without being maybe as busy as had been predicted. But even now with a very low volume of electric vehicles on the road it’s problematic. Try tripling that (still a very low number as a %) and then it’s complete chaos and unworkable. 

The infrastructure is lagging behind the needs of the industry and potential consumers. 

I would buy an EV if I had confidence that this sort of journey I have to do several times a year with young kids could be manageable without too much disruption. Adding a few minutes on the wait is fine. Doubling stopping time or needing multiple stops simply isn’t. Nor is not having the stereo on or the AC on. 

EVs are marvellous. It’s time the actual infrastructure to support them was close to adequate and it’s not. 

MouldyOldDough

iwb100 said:

Petriix said:

It's actually a totally valid question, and one which people should fully understand before choosing an EV. The real answer is that an EV doesn't 'have a range' at all. The quoted 'range' is usually the WLTP result, but there's also the 'GOM' (Guess'o'meter) range displayed in the vehicle itself which is can be highly misleading. 

Actual range varies massively depending on factors including speed, journey type, driving style, temperature and weather conditions.

A typical EV is actually most efficient at somewhere between 15 and 30 mph and, in ideal conditions with the HVAC off, it's possible to vastly exceed the WLTP range.

I've managed to push my standard range MG5 to over 250 miles despite having a WLTP range of under 220. That involved sticking below 65mph and patiently following high vehicles in perfect conditions. On the other hand, I've seen below 150 miles when driving fast in the cold, wind and rain.

Most of the time, range is unimportant because most journeys are short. However, on long journeys you soon learn to optimise your speed to achieve a balance between making progress and minimising charging stops. 

I did a 336 mile journey both ways over the bank holiday. In an ICE. I stopped once each way. I didn’t need to refuel so each time the stop was thirty minutes to get the kids fed and toileted then back in the car. In each stop I noted that all chargers were being used. I also noted some of them were blocked by cars but were actually out of action. The charging points caused the car parks to back up unnecessarily as people jostled for the chargers.

I keep coming back to the basic infrastructure problem. The roads over the bank holiday were busy without being maybe as busy as had been predicted. But even now with a very low volume of electric vehicles on the road it’s problematic. Try tripling that (still a very low number as a %) and then it’s complete chaos and unworkable. 

The infrastructure is lagging behind the needs of the industry and potential consumers. 

I would buy an EV if I had confidence that this sort of journey I have to do several times a year with young kids could be manageable without too much disruption. Adding a few minutes on the wait is fine. Doubling stopping time or needing multiple stops simply isn’t. Nor is not having the stereo on or the AC on. 

EVs are marvellous. It’s time the actual infrastructure to support them was close to adequate and it’s not. 

How about traffic jams?
I am aware that an IC car needs fuel but I can imagine the stress of sitting in stationary traffic watching your range drop from using accessories /aircon
Not knowing whether you will be able to recharge at the next stop
For IC cars it's a simple quick refill but not EV's

Jenni_D

MouldyOldDough said:

iwb100 said:

Petriix said:

It's actually a totally valid question, and one which people should fully understand before choosing an EV. The real answer is that an EV doesn't 'have a range' at all. The quoted 'range' is usually the WLTP result, but there's also the 'GOM' (Guess'o'meter) range displayed in the vehicle itself which is can be highly misleading. 

Actual range varies massively depending on factors including speed, journey type, driving style, temperature and weather conditions.

A typical EV is actually most efficient at somewhere between 15 and 30 mph and, in ideal conditions with the HVAC off, it's possible to vastly exceed the WLTP range.

I've managed to push my standard range MG5 to over 250 miles despite having a WLTP range of under 220. That involved sticking below 65mph and patiently following high vehicles in perfect conditions. On the other hand, I've seen below 150 miles when driving fast in the cold, wind and rain.

Most of the time, range is unimportant because most journeys are short. However, on long journeys you soon learn to optimise your speed to achieve a balance between making progress and minimising charging stops. 

I did a 336 mile journey both ways over the bank holiday. In an ICE. I stopped once each way. I didn’t need to refuel so each time the stop was thirty minutes to get the kids fed and toileted then back in the car. In each stop I noted that all chargers were being used. I also noted some of them were blocked by cars but were actually out of action. The charging points caused the car parks to back up unnecessarily as people jostled for the chargers.

I keep coming back to the basic infrastructure problem. The roads over the bank holiday were busy without being maybe as busy as had been predicted. But even now with a very low volume of electric vehicles on the road it’s problematic. Try tripling that (still a very low number as a %) and then it’s complete chaos and unworkable. 

The infrastructure is lagging behind the needs of the industry and potential consumers. 

I would buy an EV if I had confidence that this sort of journey I have to do several times a year with young kids could be manageable without too much disruption. Adding a few minutes on the wait is fine. Doubling stopping time or needing multiple stops simply isn’t. Nor is not having the stereo on or the AC on. 

EVs are marvellous. It’s time the actual infrastructure to support them was close to adequate and it’s not. 

How about traffic jams?
I am aware that an IC car needs fuel but I can imagine the stress of sitting in stationary traffic watching your range drop from using accessories /aircon
Not knowing whether you will be able to recharge at the next stop
For IC cars it's a simple quick refill but not EV's

You've already been told this before ... in stationary traffic an EV uses no power at all (except for ancillary services like A/C, radio etc.). An ICEV also uses no fuel whilst stopped ... but use of A/C etc. often requires the engine to be running, and even if not, using it will quite quickly lead to the engine having to run to avoid the battery discharging. Thus the "range" of an ICEV is equally impacted in such situations.