FiddlerJohn
Posts: 244
Joined: Sat Jan 07, 2012 9:51 pm
Location: Bowie, Maryland

Re: i'er iChart: Reduce Max Range 1 mile/°C

Thu Feb 16, 2012 1:23 pm

http://yfrog.com/hwr0rqzj

35km/25°C=1.5 km/°C ~ 1 mile/°C below 0°C
Reduce max Range 1 mile/°C

or:
35 km/117 km (max range in chart)= 30% reduction in range for -25 °C

jray3
Posts: 1691
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Location: Tacoma area, WA
Contact: Website

Re: i'er iChart: The iMiev Range Chart. ANY VOLUNTEERS?

Thu Feb 16, 2012 3:27 pm

John, thanks for such detail. Can you point to any more detail on the balancing method or hardware? In looking at range extension options, I've zeroed in on the HVDC charger output, which appears to be a quick disconnect.
Pictured http://www.caranddriver.com/photos-10q1/335484/mitsubishi-i-miev-on-board-charger-photo-335603
That may be a place to add in a pigtail for 330V input/output (no more than 10A at first, to match charger output). If a supplemental 330VDC source were plugged in there, it could be disconnected often to allow the OEM pack balancing process, and this method may not actually require any permanent modifications to the car.
2012 i-SE "MR BEAN" 110,300 miles
2016 KIA SOUL EV, 90 kW, 27 kWh, 34k miles
2000 Mazda Miata EV, 78 kW, 17 kWh
1983 Grumman Kurbwatt EV,170 kW, 32 kWh
1983 Mazda RX-7 EV 43 kW 10 kWh
1971 "Karmann Eclectric" EV 240 kW 19 kWh

FiddlerJohn
Posts: 244
Joined: Sat Jan 07, 2012 9:51 pm
Location: Bowie, Maryland

Re: i'er iChart: The iMiev Range Chart. ANY VOLUNTEERS?

Sun Mar 04, 2012 4:32 pm

jray3 wrote: ... Can you point to any more detail on the balancing method or hardware? ... charger output, which appears to be a quick disconnect. Pictured ...

jray3, I like your ideas. Your question was the inspiration for the post: "BMU,Cautions,CMU, SERVICE PLUG, BALANCER,CAN, K-Line."

Here is a better display of the iChart:

Image

I'm still not happy with this iChart. After a get my iMiEV, I will be able to do a little better. The approximation that TWICE THE SPEED WILL HALVE THE RANGE is a good rule of thumb.

drees
Posts: 2
Joined: Tue May 28, 2013 10:49 pm
Location: Encinitas, CA

Re: i'er iChart: The iMiev Range Chart. ANY VOLUNTEERS?

Tue May 28, 2013 11:05 pm

Code: Select all

iChart:iMiev Range in MILES v5 – John Annen
MPH        35  40  45  50  55  60  65  70  75
BARS   %                                     
16   100  100  90  83  73  67  62  56  52  47
15    94   94  84  76  67  61  56  50  46  41
14    87   87  72  71  62  57  52  57  43  39
13    81   81  72  66  59  53  49  44  41  36
12    72   72  64  58  51  57  43  39  36  33
11    66   66  58  53  47  43  40  36  34  31
10    60   60  52  47  41  38  34  30  28  27
 9     56   56  49  44  39  36  33  29  26  24
 8     50   50  47  41  37  35  31  27  24  21
 7     44   44  37  33  29  26  24  21  20  18
 6     37   37  31  27  23  21  19  17  15  14
 5     31   31  26  22  18  16  14  12  11  10
 4     25   25  21  18  15  14  13  14  12   9
 3     19   18  18  15  14  13  12  10   9   7
 2     12   12  12  10   9   9   8   7   6   5
 1      6    6   6   5   5   4   4   4   3   3

Reformatted the chart so it's readable here on the forum.

How accurate is this chart in people's real-life experience?

JoeS
Site Moderator
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Location: Silicon Valley, California

Re: i'er iChart: The iMiev Range Chart. ANY VOLUNTEERS?

Wed May 29, 2013 8:00 am

drees, thank you for reformatting John's chart and posting it here so we can all easily read it.

Sure, aerodynamics (and thus speed) plays a major role. Disregarding all the other significant variables (HVAC, altitude change, head/tailwinds, ambient temperature), this chart is probably a pretty good start for those who worry about that sort of thing. For myself, I only looked at the top row and said "yeah, that's about right", and ignored all the rest.

Range is of foremost concern prior to purchase and early-on in EV ownership. After a few weeks it becomes a non-issue. We drive the car normally, reflexively adjusting our driving and HVAC settings and charging regimen to arrive at our destination (where we can charge) with a comfortable distance and time cushion remaining.

For highway trips over about 50-60 miles or without guaranteed charging at the destination or that are time-constrained, I simply take the hybrid.

Not worth anyone's time picking the nits, IMO. ;)
EVs: 2 Wht/Blu SE Prem., '13 Tesla MS85, 3 156v CorbinSparrows (2 Li-ion), 24v EcoScoot(LiFePO4)
EV Conv: 156v '86 Ram PU, 144v '65 Saab 96
Hybrids: 48v1kW bike
ICE: '88 Isuzu Trooper. Mothballed: '67 Saab (orig.owner), '76 MBZ L206D RHD RV

drees
Posts: 2
Joined: Tue May 28, 2013 10:49 pm
Location: Encinitas, CA

Re: i'er iChart: The iMiev Range Chart. ANY VOLUNTEERS?

Wed May 29, 2013 9:03 am

JoeS wrote:For highway trips over about 50-60 miles or without guaranteed charging at the destination or that are time-constrained, I simply take the hybrid.

Not worth anyone's time picking the nits, IMO. ;)

For sure - the top line is the one I'm most interested in. My parents just picked up an iMiEV (I've had a LEAF for nearly 2 years now so am very familiar with it's capabilities), so I'm trying to figure out what's possible at various speeds.

For example, I know that in my LEAF doing mostly 65 mph on the freeway with a bit of surface streets mixed in, 70 miles is about as far as I want to push it without some recharging on a 100% charge (obviously have some backup plans). On a 80% charge, 50 miles is about the limit - in both cases, this leaves about 10 miles of buffer for "just in case" scenarios. On the LEAF at least, A/C usage is negligible on the freeway unless it's over 90F.

So assuming I want to leave 10 miles of buffer and I have a 50 mile trip, it looks like I would want to limit speeds to 65 mph max and really aim for a few MPH slower than that. Good starting point?

JoeS
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Re: i'er iChart: The iMiev Range Chart. ANY VOLUNTEERS?

Wed May 29, 2013 9:22 am

dees, delighted that you are now a two-EV family!
drees wrote:So assuming I want to leave 10 miles of buffer and I have a 50 mile trip, it looks like I would want to limit speeds to 65 mph max and really aim for a few MPH slower than that. Good starting point?
Right On!

Good comparison that the fully-charged iMiEV has roughly the same range as an 80%-charged Leaf (2010-2012). It's all in the ballpark, as an individual driver's hypermiling abilities are the primary contributors to any differences. With our ability to quickly pop her into N and better control over regen than the Leaf, I find hypermiling easier and more satisfying in the iMiEV than the Leaf.

Our heater is by far the biggest range-robber after speed. Aircon and all the other electrical accessories (including the seat heater) are negligible in comparison.

Note that for battery longevity some of us rarely drop below four bars nor charge above about 13 bars. I only fully-charge just before setting off on a longer trip.
EVs: 2 Wht/Blu SE Prem., '13 Tesla MS85, 3 156v CorbinSparrows (2 Li-ion), 24v EcoScoot(LiFePO4)
EV Conv: 156v '86 Ram PU, 144v '65 Saab 96
Hybrids: 48v1kW bike
ICE: '88 Isuzu Trooper. Mothballed: '67 Saab (orig.owner), '76 MBZ L206D RHD RV

aarond12
Posts: 388
Joined: Fri Jan 25, 2013 2:21 pm
Location: Dallas, TX

Re: i'er iChart: The iMiev Range Chart. ANY VOLUNTEERS?

Wed May 29, 2013 1:39 pm

Remember that the i-MiEV's aerodynamics have a big part in this. I made a 72 mile highway trip by following (safely) behind a large truck at 60MPH. A 120V charge was done at the mid point, but I could have made it without the charge. Barely. Probably would've met Mr. Turtle for the first time.
2015 Nissan LEAF S

Barbagris
Posts: 237
Joined: Wed Feb 20, 2013 8:34 am
Location: Bilbao, Spain

Re: i'er iChart: The iMiev Range Chart. ANY VOLUNTEERS?

Wed May 29, 2013 2:39 pm

A quick test;

How it fits into real life?

Image
...learning...

Don
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Location: Biloxi MS

Re: i'er iChart: The iMiev Range Chart. ANY VOLUNTEERS?

Wed May 29, 2013 5:18 pm

Neither of the above graphs makes any sense to me

The red line crosses 100 miles of range at about 47.5 mph and 50 miles of range at about 77.5 mph - Neither are possible

The blue power line crosses 5KWH of energy usage at about 40 mph, which would make it seem like you could go more than 120 miles (on 15KWH) at 40 mph and that's not possible either

I can't find anything on that graph which seems do-able

Don
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2012 iMiEV SE Premium, Raspberry Metallic
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