Charging Power Taper Curve

fx860e · 2026-02-23T17:02:47+0000

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

HStrophyPHEV2025rc · 2026-02-23T17:34:52+0000

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

W12Lad · 2026-02-23T21:37:53+0000

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

fx860e · 2026-02-24T08:12:54+0000

HStrophyPHEV2025rc said:
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.

W12Lad said:
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 · 2026-02-24T10:51:30+0000

W12Lad said:
A little over 4 minutes to the finish. That's impressive.

A little over 4 hours perhaps, sorry repetition.

Noel · 2026-02-24T11:06:27+0000

fx860e said:
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 · 2026-02-24T11:10:02+0000

fx860e said:
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 · 2026-02-24T11:35:27+0000

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 · 2026-02-24T20:25:02+0000

Enshnk said:
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 · 2026-02-24T20:49:09+0000

Noel said:
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.

BarrieG · 2026-02-24T23:48:46+0000

Just to summarise my previous messages:
340 miles from Dieppe to La Rochelle, mainly 70-80mph motorways. Started with zero battery miles (don't ask!), so virtually all on petrol, but self charging resulted in enough battery miles to finish the journey in EV mode. Result 49 mpg
175 miles from Milton Keynes to Birkenhead, mainly motorway. This is a regular journey where I start with a full battery which I use for the first 25 miles to the motorway, then switch to HEV once up to 70mph. Self charging adds to the battery mileage again, so just after Keele services I can push it back into EV mode to arrive at my destination with an empty battery. Result 75 - 90 mpg depending on how many times I've had to slow down to 50mph.
On the 20th July last year I put 28½ litres in to fill the tank, in preparation for the French trip, after a six week period since the last fill up. During this time I had covered 1,105 miles, mainly EV, to give an average 176mpg.

BarrieG · 2026-02-24T23:53:24+0000

Sorry mods, although this is relevant to the last message perhaps you would prefer to move it to the Fuel Consumption topic?

Charging Power Taper Curve

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