On 07/12/2018 01:00, EVDL Administrator via EV wrote:
On 6 Dec 2018 at 17:28, Steve Heath via EV wrote:
The best mile/Kw I have got has been 180 and the worst is 230. Average
is 190 ...
If you're getting 190 miles per kWh, I want your EV.
I think you probably mean Wh/mile, not miles/kWh.
and this measurement is based on coulomb counting over the distance.
i.e. measuring the amount of power supplied by the batteries to travel
the distance.
I think you mean energy, not power. :-)
My apologies - you are right. I have given myself 30 minutes detention :)
This is not the same as the amount of [energy] from the plug to charge the
batteries nor is it the same [energy] that the motor uses which causes
further complications.
I'm not sure that I understand what the further complications are. As far
as I can see, it should be just simple math. The energy use measured at
the motor should be the same as the energy consumed at the battery, minus
some percentage for losses in the controller, which will vary with
conditions, but can be averaged. Am I missing something?
Not really but there are other factors that come into play such as
battery recovery time, regen and so on. It makes these losses very
difficult to calculate as they are non-linear and condition dependent.
Averaging is better than nothing. The level of effect is also dependent
on how much leeway you have in your vehicle. To me it is very important
as I have a small battery pack - it is now around 6-7kw - and saving 10
or 20 watts per mile can make a big difference.
All this is all to do with removing/reducing range anxiety. Matters are
not helped when power consumption doubles when the heater is on. Why
manufacturers don't have a separate battery pack for the ancillaries so
that their use does not reduce the driving range, I don't know.
Presumably it is cost and the amount of power needed to power all the
gizmos that marketing insist must be present. Anyway getting away from
the original topic.
Cheers
Steve
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