Charging Power Taper Curve

[fx860e]

For those that like to see graphs and tables, here is one that i made while charging the 24.7 kWh battery of my HS PHEV.

Charging Percentage​	Time in Minutes​	Range in Miles​	Power in (kW)​
1%​	1​	0​	7.0​
5%​	5​	2​	7.0​
10%​	15​	6​	7.0​
20%​	37​	12​	7.0​
30%​	57​	19​	7.0​
40%​	1.17​	27​	7.1​
50%​	1.37​	36​	7.0​
60%​	1.59​	44​	7.0​
70%​	2.18​	51​	7.0​
77%​	2.32​	56​	7.0​
78%​	2.37​	57​	6.7​
79%​	2.39​	58​	6.4​
80%​	2.40​	58​	6.3​
90%​	3.08​	66​	4.2​
91%​	3.11​	67​	4.2​
92%​	3.15​	68​	4.2​
93%​	3.20​	68​	4.3​
94%​	3.21​	69​	4.2​
95%​	3.26​	70​	4.0​
96%​	3.29​	71​	3.2​
97%​	3.34​	72​	2.1​
98%​	3.41​	72​	1.9​
99%​	3.48​	73​	1.6​
100%​	3.56​	73​	1.0​
Balancing​	3.59​	74​	0.3​
Finish​	4.04​	74​	0.0​

Key Charging Milestones​

Time Elapsed	Range Added	Power Level	Battery Status
Start	0 Miles	7.0 kW	Charging at full speed.
1 Hour	20 Miles	7.0 kW	Consistent power delivery.
2 Hours	44 Miles	7.0 kW	Still at peak efficiency.
2.5 Hours	56 Miles	7.0 kW	Final moments of full speed.
3 Hours	65 Miles	4.4 kW	Tapering: Speed is slowing down.
4 Hours	74 Miles	0.0 kW	Full: Battery is balanced.

Efficiency: The car gained approximately 1 mile of range for every 3.3 minutes of charging during the first three hours.

The "Slow" End: It took 2 hour and 32 minutes to get the first 56 miles, but the final 18 miles took nearly 1 hour 24 minutes because the power dropped so significantly.

 

[HStrophyPHEV2025rc]

Wow, I love all that information! Brilliant! Thanks for taking the time/trouble to post this - very interesting to many of us!

 

[W12Lad]

A little over 4 minutes to the finish. That's impressive.

 

[fx860e]

Wow, I love all that information! Brilliant! Thanks for taking the time/trouble to post this - very interesting to many of us!

Thanks, I do have the full 1-100% table but the site wouldn’t let me upload it in full as it was ‘to large’, so I only included the most interesting information.
I made the table so I will be able to compare it in a few years to see how much of a loss in capacity there would be with the battery over time, but I thought I’d share in the meantime.

A little over 4 minutes to the finish. That's impressive.

DOH! Missed that. But you never know maybe in 10 years time, if we are not all using flux capacitors by then.

 

[Noel]

A little over 4 minutes to the finish. That's impressive.

A little over 4 hours perhaps, sorry repetition.

 

[Noel]

For those that like to see graphs and tables, here is one that i made while charging the 24.7 kWh battery of my HS PHEV.

View attachment 43773

Charging Percentage​	Time in Minutes​	Range in Miles​	Power in (kW)​
1%​	1​	0​	7.0​
5%​	5​	2​	7.0​
10%​	15​	6​	7.0​
20%​	37​	12​	7.0​
30%​	57​	19​	7.0​
40%​	1.17​	27​	7.1​
50%​	1.37​	36​	7.0​
60%​	1.59​	44​	7.0​
70%​	2.18​	51​	7.0​
77%​	2.32​	56​	7.0​
78%​	2.37​	57​	6.7​
79%​	2.39​	58​	6.4​
80%​	2.40​	58​	6.3​
90%​	3.08​	66​	4.2​
91%​	3.11​	67​	4.2​
92%​	3.15​	68​	4.2​
93%​	3.20​	68​	4.3​
94%​	3.21​	69​	4.2​
95%​	3.26​	70​	4.0​
96%​	3.29​	71​	3.2​
97%​	3.34​	72​	2.1​
98%​	3.41​	72​	1.9​
99%​	3.48​	73​	1.6​
100%​	3.56​	73​	1.0​
Balancing​	3.59​	74​	0.3​
Finish​	4.04​	74​	0.0​

I also have a PHEV and a 32A charger, and whilst I’ve not produced a graph, I concur with your findings.
Whilst the HS PHEV has ‘niggles’ I’m very pleased with mine. I took delivery in November, and have done around 400miles, of mainly local, with occasional 50 mile trips.
I use HEV mode and the car quietly sorts out everything. The mpg display has 4 digits which shows 99.9mpg. However, my calculations indicate the true figure to be 115mpg!
In addition we are with British Gas which provide half price (12.5p/kWh) on Saturday and Sunday between 11am and pm, with occasional other random half price slots.
Cheers Noel.

 

[Enshnk]

Thanks, I do have the full 1-100% table but the site wouldn’t let me upload it in full as it was ‘to large’, so I only included the most interesting information.
I made the table so I will be able to compare it in a few years to see how much of a loss in capacity there would be with the battery over time, but I thought I’d share in the meantime.


DOH! Missed that. But you never know maybe in 10 years time, if we are not all using flux capacitors by then.

This graph is fantastic, thank you for your contributions. Could you please send me the percentages from 1% to 100% in an Excel spreadsheet or via private message?

 

[Noel]

Hi fx860e. Thanks for the graph very impressive.
Whilst the HS PHEV has ‘niggles’ I’m very pleased with mine. I took delivery in November, and have done around 400 miles, of mainly local, with the occasional 50 mile trip.
I use HEV mode, and the car quietly sorts out everything. The mpg display has 4 digits and shows 99.9mpg. However, my calculations indicate the true figure to be 115mpg! I will try using EV, to see if the mpg can be improved, but 115 is already excellent, for a large, heavy vehicle.
In addition we are with British Gas which provides half price (12.5p/kWh) on Saturday and Sunday between 11am and 4pm, with occasional other random half price slots.
Cheers Noel.

 

[fx860e]

This graph is fantastic, thank you for your contributions. Could you please send me the percentages from 1% to 100% in an Excel spreadsheet or via private message?

Hi sure glad to help Ive attached a PDF file which should show all the findings.

 

[fx860e]

Hi fx860e. Thanks for the graph very impressive.
Whilst the HS PHEV has ‘niggles’ I’m very pleased with mine. I took delivery in November, and have done around 400 miles, of mainly local, with the occasional 50 mile trip.
I use HEV mode, and the car quietly sorts out everything. The mpg display has 4 digits and shows 99.9mpg. However, my calculations indicate the true figure to be 115mpg! I will try using EV, to see if the mpg can be improved, but 115 is already excellent, for a large, heavy vehicle.
In addition we are with British Gas which provides half price (12.5p/kWh) on Saturday and Sunday between 11am and 4pm, with occasional other random half price slots.
Cheers Noel.

Hi Noel, we've only just got ours a few weeks ago, and have only used it for local driving so far, and only on EV mode. Haven't had to use any petrol at all yet.
We live in north wales so sometime we are going to go further than the 60-75 miles, in fact we are going down to Kent in the next few months some 300-350 miles and we are wondering how the car will work on HEV.
At the moment we are coming to the end of our British Gas contract as we only get half price for 5 hours on a Sunday and sometimes when they offer the odd few hours at other times. In the next few weeks we will be changing to Scottish Power as they are offering 6p a unit from the charger that they have already installed at any time we need it. (Or so they are promising, hope it goes OK.)
Thanks Chris.

 

[Noel]

Hi Noel, we've only just got ours a few weeks ago, and have only used it for local driving so far, and only on EV mode. Haven't had to use any petrol at all yet.
We live in north wales so sometime we are going to go further than the 60-75 miles, in fact we are going down to Kent in the next few months some 300-350 miles and we are wondering how the car will work on HEV.
At the moment we are coming to the end of our British Gas contract as we only get half price for 5 hours on a Sunday and sometimes when they offer the odd few hours at other times. In the next few weeks we will be changing to Scottish Power as they are offering 6p a unit from the charger that they have already installed at any time we need it. (Or so they are promising, hope it goes OK.)
Thanks Chris.

Hi Chris. Be interesting to learn how you get on with Scottish power, you say that they installed a charger, I suspect that you had to pay for that.
We were with SP and they still pay us our solar FIT payments. If we were to change back to them they would know exactly how much power we send to the grid, instead of assuming we send 50%, not that it would make a great deal of difference.
Come April I anticipate that a lot will change, when all the new tariffs are announced, and we can then choose both tariffs and suppliers.