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

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

Thu Jan 26, 2012 12:42 pm

Tony Williams, the Nissan LEAF guy, has a GREAT mileage "range chart."

Us "i'ers" need a iChart like this. ANY VOLUNTEERS?

The following is my meager attempt at the i'er iChart version 4.

http://www.facebook.com/media/set/?set=a.2790482153603.2125305.1004832596&type=1&l=51a8b1aa1f
Last edited by FiddlerJohn on Sat Feb 04, 2012 8:50 pm, edited 6 times in total.

MtnViewMark
Posts: 30
Joined: Thu Dec 22, 2011 2:57 pm
Location: Mountain View, CA

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

Thu Jan 26, 2012 9:38 pm

I'd be happy to apply my graphic design skills to create such a chart (or perhaps one Tufte could like a little more).

But, where does the data come from? Reported driving runs? Actually energy usage calcs? Something interpolated in between? Get me the data -- I'll draw you the chart.

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

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

Sat Jan 28, 2012 6:24 am

MtnViewMark,
Here's the data (version 5)


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


1. Subtract one Bar for each 20 minutes of A/C.
2. Subtract one Bar for each 40 minutes of heat.
3. The range below Bar 1 is reduced by battery cell imbalances. The i needs
to be charged to 100% to rebalance the cells. The REBALANCE is most
important after several less than 100% charges. The i can go 6 miles in
turtle mode if the cells are balanced. Don't count on it.
4. Add One mile at 60mph for every 15 min. charge on 120V 8A iCharger
5. Add One mile at 60mph for every 5 minutes of 240V, 16amp charger
6. Wind speed is more important than ground speed for calculating range.
50mph with 10mph headwind equals 60mph range in the iChart.
7. Add 1% to range for each 4° F above 70° F
8. Subtract 1% in range for each 2°F below 70° F
9. Subtract 2% in range for every 10,000 miles for Battery Degradation.
10. Increase range 1.5% per 1000 ft/300m for air density above sea level
11. Heavy loads get less range than light loads.
12. Wind load goes up as the third power of wind speed. Twice the
speed (mph) creates 8x the wind resistance.
13. Rain decreases range.

The formatting looks better with version 5 at:

http://www.facebook.com/media/set/?set=a.2790482153603.2125305.1004832596&type=1&l=51a8b1aa1f
I am still try to make the table more accurate.

-- John Annen
Last edited by FiddlerJohn on Wed Feb 08, 2012 10:12 pm, edited 14 times in total.

Wee John
Posts: 134
Joined: Thu Jan 12, 2012 6:15 am
Location: SF East Bay

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

Sat Jan 28, 2012 10:10 am

These numbers are with no heater or AC, right? If so, I would say they are pretty accurate with my driving experience so far.

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

Re: i'er iChart: Caviots

Sat Jan 28, 2012 11:25 am

Wee John wrote:These numbers are with no heater or AC, right? If so, I would say they are pretty accurate with my driving experience so far.

Wee John,
You are correct. Give me some of your data, and I will adjust the iChart. Here are a few other adjustments.
1. Subtract one Bar for each 20 minutes of A/C. Wee John, What's your data?
2. Subtract one Bar for each 40 minutes of heat.
3. The range below Bar 1 is reduced by battery cell imbalances. The i needs to be charged to 100% to rebalance the cells. The REBALANCE is most important after several less than 100% charges. The i can go 6 miles in turtle mode if the cells are balanced. Don't count on it.
4. Add One mile of range @ 60mph for every 15 minute charge at 120 volt 8 amp iCharger
5. Add One mile of range @ 60mph for every 5 minutes of charge at 240 volt/16amp w/3.3kW charger
6. Wind speed is more important than ground speed for calculating range. 50mph with 10mph headwind equals 60mph range in the iChart.
7. Add 1% to range for each 4° F above 70° F
8. Subtract 1% in range for each 2°F below 70° F
9. Subtract 2% in range for every 10,000 miles for Battery Degradation.
10. Increase range 1.5% per 1000 ft/300m for air density above sea level
11. Heavy loads get less range than light loads.
12. Wind load goes up as the third power of wind speed. Twice the speed (mph) creates 8x the wind resistance.
13. Rain reduces range.

Latest version4:
http://www.facebook.com/media/set/?set=a.2790482153603.2125305.1004832596&type=1&l=51a8b1aa1f
Last edited by FiddlerJohn on Sat Feb 04, 2012 8:38 pm, edited 3 times in total.

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

Re: iChart: iMiev Range vs. Temperature and RAIN

Fri Feb 03, 2012 8:31 pm

The Range vs.Temperature graph is different than the notes in the iChart.

http://www.facebook.com/media/set/?set=a.2834022162076.2125951.1004832596&type=1&l=bfa44cc1c9

This is real data with the iMiEV using somewhat random heater and A/C. The triangles indicate that driving in the RAIN reduces range.

markbb99
Posts: 7
Joined: Tue Jan 24, 2012 1:56 pm

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

Tue Feb 07, 2012 4:08 pm

Here is 3 months of actual real world range of the I Miev. Does it match the range chart? It match the 62 US(EPA) average
http://evdrive.wordpress.com/2012/02/07/the-return/

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

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

Tue Feb 07, 2012 10:59 pm

markbb99 wrote: Does it match the range chart?

Image
markbb99,
Great data. Thanks. My iChart seems worst than optimistic. I need an iChart version 5 DO-OVER. Sorry

Does your graph include a third of your driving above 50mph? (I am guessing No.)
From your text very little accessory use. Headlamps? Rain? Snow?
Maybe temperature is biggest difference. The iChart is for 70°F. If your car was at 0°F, the 70°F difference indicates a 35% reduction in range.
At low speeds the heater can also make up to a 30% derating of range. I am assuming the heater draws ~ 1.5 kW peak. ( Not for your graph though.)

Anybody else have data to share?
Last edited by FiddlerJohn on Wed Feb 08, 2012 1:20 pm, edited 1 time in total.

JohnQ
Posts: 1
Joined: Wed Feb 08, 2012 11:45 am

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

Wed Feb 08, 2012 11:53 am

I'd just like to say that the charging data above is from my blog.
I've had the use of an i-MiEV for 3 months won in a competition through the UK energy provider E.ON.

To answer questions on usage I'd say only a small amount was done over 50 mph, mainly as the conditions didn't allow and I was aware that above this the battery drained a lot more quickly.
The conditions were across a British Winter with some freezing days and a lot of wet days. So temperatures from -5C to 10C. I didn't venture out in the snow as I was concerned about possible damage on the ice. I avoided using the heater apart from to defrost the car when first setting off. Hope this helps.

JoeS
Site Moderator
Posts: 3843
Joined: Thu Dec 15, 2011 5:47 am
Location: Silicon Valley, California

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

Fri Feb 10, 2012 8:14 am

JohnQ - thank you for diligently keeping track of your usage and posting this information. I've just received my iMiEV and have already started keeping track of my input energy and usage. Your data was taken in conditions significantly cooler than what we experience here in California (not in mountains - where our winters are a skier's haven), so I would expect our performance to be better; however, your minimal use of the motorway/freeway gives you the efficiency advantage, as the iMiEV's relatively poor aerodynamics exacts a significant penalty at those speeds. Time will tell…

FiddlerJohn, I'm still grappling with the underlying assumptions (and their source) for each of the variables which goes into the Leaf and your charts. For the time being, I'm taking the empirical approach… for example, my wife (a featherfoot) took the car to town yesterday, leaving with 15 bars and a RangeRemaining of 58 miles. She drove 16.3 miles, and came back with 13 bars and RR of 57 miles. I think my iMiEV is still trying to figure out her driving style… :roll:
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

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