[Oeva-list] charging efficiency

chris at darkstarpro.com chris at darkstarpro.com
Wed May 18 11:27:03 PDT 2011


For those curious on how the Shorepower EVSEs function, I made a video
this morning describing the details along with some things to look out for
if you're having issues:

http://vimeo.com/23917416

Let me know if this is helpful!

Sincerely,
Chris Arnesen

> Shecked the Salem PGE station.  It's working, so you should be good to go!
>
> Jeff
>
> On Tue, May 17, 2011 at 2:29 PM, Alan Batie <alan at batie.org> wrote:
>
>> I think I need to adopt a tag line of "Having Range Anxiety so you don't
>> have to" ;-)
>>
>> As I'm looking over the data from the trip this weekend (and there's a
>> lot more to think about than I imagined! so full report coming later),
>> I'm wondering about how to think about some of it:
>>
>> My car reported that it used 19kwh to go to Portland Saturday, 23kwh -
>> 4kwh in regeneration.  I charged for 3 hrs total at the 3.3kwh stations
>> along the way, and put in 15kwh at the fast charger, which adds up to
>> about 25kwh, which seems consistent, since I know there is "overhead" in
>> charging.
>>
>> When I got home, I pushed it by going directly from Salem to home ---
>> I'd charged enough to make it to LBCC, but when I got to Albany, I
>> realized that at the rate I was going, I could just make it, and did
>> (albeit by driving 5mph below the speed limit from Albany to a couple
>> miles from home): it said "10 miles" left, with the 2 red bars
>> (
>> http://alan.batie.org/photos/canon-a1000/2011/0515-leaf-pdx/img_2595-640.shtml
>> ),
>> and the Blink reported that that charge used 20.5kwh.  That is
>> consistent with the 24kwh spec on the battery pack --- the 12 bars make
>> it 2kwh/bar, so the 10 white bars add up to 20kwh.  But 20kwh of battery
>> should mean 27kwh consumed at 75%...
>>
>> The Salem Nissan is almost exactly at the halfway point, and I left
>> there about 2/3rds full showing "47 miles"
>> (
>> http://alan.batie.org/photos/canon-a1000/2011/0515-leaf-pdx/img_2593-640.shtml
>> ).
>>  The "10 miles" left is consistent with what I've found to be a useful
>> ball park of 5 freeway miles/bar (it's better than that a little, but it
>> makes a good rule of thumb).
>>
>> Going the other direction, if I assume that the charging efficiency is
>> about 75% (19/25), that makes it 16kwh, which means it's more like 32kwh
>> to get to Portland, and *that's* more consistent with what I'm seeing
>> for the range on the car.
>>
>> One problem is that the bars are too coarse --- the 6 white bars I had
>> when I left Salem could be "just barely past 5" so it could have been
>> essentially 60% charge, which is consistent with what the car's
>> reporting that indicates I could almost make it to Portland without
>> recharging.
>>
>> I'm thinking about testing that this weekend: after stopping to check
>> the PGE station and a 1hr charge there, and doing the whole trip at
>> 60mph, see if I can make it all the way.  If I can, I might even be able
>> to bring it up to an OEVA meeting ;-)
>>
>> Which is bringing up another consideration I didn't think I'd remotely
>> have with an EV: the mileage on a lease.  At 15,000/yr, that's way more
>> than I thought it capable of, but I have 900 miles on it now, after a
>> month ;-)  That's 11K/year --- safe, but a lot closer than I expected!
>>
>>
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