- easy question to answer, it is simply a function of speed, and max regen is got at >40mph.
As far as I could tell when first driving it, and I have had no reason to look more closely ever since, is that you get maximum, i.e. 30kW, regen at or above 40mph and it tails off linearly down to 0. So at 20mph you get 15kW regen, 10 you get 7.5kW regen, etc..
..something like that, approximate figures offered here ...
I would guess the idea is that it is unnecessary, and less good for the battery to regen over 30kW. But to regen at 30kW lower than 40mph-ish then you'd be slowing too quickly, so below that speed by keeping it proportional to speed then you get a linear, steady deceleration. If you had 30kW of regen at 5mph you'd be head-butting the steering wheel![hr]
Originally Posted by ElectricDave
To my surprise, though, according to the kW gauge, this was almost neutral from a regen point of view - the indicator fluctuated between zero and 1kw on the regen side
You lose energy during cornering, so most of the potential regen was being scrubbed off in the cornering action. Had it been a straight slope you were following down then you'd have got more regen.
Imagine free-wheeling on a flat quiet road from 10mph, now imagine doing that around a mini roundabout. Do you think you'd keep free-wheeling around the roundabout just as far?
Also bear in mind that you were probably running the heater at the same time (if you'd just set off) and the regen power goes straight into the heater. If the heater had been consuming 5kW and you were getting 5kW regen then you'd see 0kW come up on the gauge because that gauge is showing what's going in/coming out of the battery, not what the motor is doing.