Peter VanDerWal via EV wrote:
While I'm not an expert on LiIons, everything I've read indicates
you'll get the best life from them if you avoid discharging them past
10-20% SOC and also avoid charging them past 90% SOC.
My Chevy Volt has a solid 50 mile range (+/-) and a 18.4kWh pack.
As for cold weather, my understanding is that this might
not reduce range directly, but all of the production EVs seem to
include battery heaters to avoid damaging the battery when it's cold.
These heaters take a fair amount of energy and this DOES reduce your
driving range.
Not so much the battery heaters; most are quite small, and are mainly on
when the car is plugged in, so they're not powered by the battery. It's
the car's heater (and A/C) that really suck the power in cold (or hot)
weather. In 0 deg.F winter weather, our Leaf loses half its range.
So 40kWh sounds about right (to me) for a long life
pack with a reliable 100 mile range.
That's a safe, conservative estimate that would apply for aggressive
driving, and a relatively inefficient vehicle.
An efficient car will do better. Careful driving also helps (no
lead-footing). Dave Delman's rule of thumb (weight of vehicle / 10 =
Wh/mile) is a good estimate in my experience. So a 32kWh battery would
take a 3200 lbs vehicle 100 miles.
I would avoid Nissan Leaf's. They have horrible battery management
systems (at least the older models) and their packs tend to degrade
quickly.
I too would avoid the early 2011-2012 Leafs, which have had a less
reliable pack, especially in hot climates. But I haven't seen any
similar problem with the 2013 and later (mine is a 2013, and still has
90% of its original range).
Lee Hart
--
Ring the bells that still can ring
Forget your perfect offering
There is a crack in everything
That's how the light gets in.
-- Leonard Cohen, from "Anthem"
--
Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com
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