I would want another driving mode that begins reducing energy usage
before 2%.
When a person uses an incandescent flash light after an hour's use the
light is less bright than when they started. It is a direct indicator
that capacity is waning. When the flash light batteries are barely
useable you pretty much know, you are out of juice.
Same goes for a PbSO4 wet-cell pack. After a full charge (fully balanced
cells), performance is at its best, but after the 50% SOC you can tell,
the pack is not as stiff/perky as in the beginning. With a 50 mile pack,
as you approach 20% SOC you know you have about 10 miles left and to
drive conservatively to the next charge-point or home to charge.
Perhaps that mode that emulates a slow tapering of performance (like a
PbSO4 pack) would be good for EV noob drivers who are happy to drive an
ice's gas-tank until it is empty/dry (they likely also ignore the
check-engine light as well).
This mode would based on a very aggressive range saving algorithm, but
also gradually reduces the performance to turtle mode starting at about
30% SOC. For the ice to EV change over to happen, we will need to
reprogram a former ice-driver's foot.
{brucedp.150m.com}
-
On Mon, Jan 21, 2013, at 12:52 AM, David Rees wrote:
> On Sat, Jan 19, 2013 at 6:44 AM, Thos True <[email protected]> wrote:
> > According to one Nissan engineer that I spoke with in 2011, the Leaf is
> > designed to not charge above 80% nor discharge below 20%, which corresponds
> > to the on on-board display's full and empty.
>
> The LEAF has an actual battery capacity of 24 kWh as advertised.
> Nissan lets you use about 21 kWh of the 24 kWh.
>
> A 100% charge will charge the pack to about 94% total capacity.
> A 80% charge will charge the pack to about 77% total capacity.
>
> The first low battery warning comes on around 17% total capacity.
> The 2nd low battery warning comes on around 9% total capacity.
> The car goes into turtle mode around 2% total capacity and shuts down
> shortly afterwards.
>
> Voltage plots against charge confirm that these numbers are pretty close.
>
> Nissan is reserving no-where close to 20% on the top and bottom for
> actual use.
>
> This might be the case if the engineer really meant that they normally
> expect people to only charge to 80% and to charge up again by the time
> they get to the first low battery warning.
>
> -Dave
-
--
http://www.fastmail.fm - Faster than the air-speed velocity of an
unladen european swallow
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