[R_Soul]

I’ve signed up for the free 12 month BMW charge account. I rarely need to charge on public chargers, so don’t have much experience.

I’ve got a trip coming up and have noticed that an Ionity charge point would be the most convenient. Looking on the BMW charge app, it’s reported the rate to charge at this Ionity charger as free, 26p, 44p and 50p the different times I have looked. There is also a disclaimer that tariffs are subject to individual charger rates and the rate on my account.

I’ve looked on my account and that states Ionity at a flat rate of 69p. So which rate is correct? If it is the higher rate, what is the point of the BMW charging account?

[handymanuk]

26p.

[hollpe]

Just checked my latest invoice and it's 26p per kWh for the ultra fast Ionity chargers I used.

[R_Soul]

Originally Posted by hollpe

Just checked my latest invoice and it's 26p per kWh for the ultra fast Ionity chargers I used.

Thanks for confirmation, that’s a good rate.

How fast did they charge? I know they are 350 kW and the car can only take 150 - so with an 80 kWh battery it should be about 30 mins for a full charge?

[GDEvans]

Originally Posted by R_Soul

Thanks for confirmation, that’s a good rate.

How fast did they charge? I know they are 350 kW and the car can only take 150 - so with an 80 kWh battery it should be about 30 mins for a full charge?

Except you only get 150kW charge rate when the battery is almost empty. The speed drops off as the charge increases. And then drops off a cliff above 80% or so.

I work on an average of 100kW from 10% to 90%. The battery is 80kW, but only 74kW useable. Based on that, about 35 min from 10% to 90%.

[hollpe]

Originally Posted by R_Soul

Thanks for confirmation, that’s a good rate.

How fast did they charge? I know they are 350 kW and the car can only take 150 - so with an 80 kWh battery it should be about 30 mins for a full charge?

I'll need to check but I think it went from about 10% to 90% in about 30 mins. This is quite a good article on the charge curve.

https://insideevs.com/news/501674/bm...ging-analysis/

[the_ape]

Also remember depends not only on SOC at arrival, but also cell pack temp etc, and local demand for load. Even though ionity are capable of 350kW but that's at 800v. And if its a busy area with multiple chargers in use (Ionity are usually not on their own on a site too remember) then they might not be able to deliver full ampage to all chargers on the site due to local demand scaling etc.

The iX3 is 400v at 388amps (155kW) at 45c cell pack, and that's only sub10% soc. Upto 90% though it does well, I've seen 130+ on Ionity and a 101kW average over a 25 min charge session, so GDEvans predictions are about right.

Remember though, iff cellpack too hot or cold, some of the energy pumped in will be being used to cool or warm the pack.