- Joined
- Jun 13, 2011
- Messages
- 3,809
Great idea, I really like it! For my Leaf, this formula appears to be even simpler:TonyWilliams said:How about just 4.42 * (120vHours) - 100 = -SOC%
Code:
SOC % = 100 - 4 * T(120V)
Great idea, I really like it! For my Leaf, this formula appears to be even simpler:TonyWilliams said:How about just 4.42 * (120vHours) - 100 = -SOC%
SOC % = 100 - 4 * T(120V)
Even with a Rev 1 upgrade the time should be no more than half the 120v time. And even with a Rev 1 upgrade plugged into 208v it should be no more than 9.5 hours with a 16 hour 120v time.abasile said:The time to charge auto-adjusts depending on the available supply last time you plugged in. Using my Rev. 1 modified EVSE which supplies only 12A at 240V, the reported time to charge at 240V is significantly longer. Even with "standard" L2 charging, there is likely to be some variation.fooljoe said:11 hours for 80% on 240v? Tony, I think your car's broken.
lukati said:91040 said:From my trip today. Time to 100% Charge on 120V in relation to Gids:
2 hours- 253 Gids
2.5 hours- 248
3 hours- 240
3.5 hours- 234
4 hours- 228
4.5 hours- 221. Return trip- 224
5 hours- 216. Return trip- 219
5.5 hours- 210. Return trip- 211
6 hours- 203. Return trip-205
6.5 hours- 197. Return trip- 198
7 hours- 191
7.5 hours- 186. Return trip-185
8 hours- 179
8.5 hours- 172. Return trip- 175
9 hours- 168. Return trip- 169
9.5 hours- 160. Return trip- 161
10 hours- 155
Not sure if this was at 10.5, 11 or 11.5 hours- 150
Next was definitely:
12 hours- 140
13 hours- 122
14 hours- 109
15 hours- 99
16 hours- 87
17 hours- 79
18 hours- 65
Those data are beautifully linear. In fact R = -0.997!
You get Gids using the following formula:
Gids = hours (to 100% charge at 120V) x -11.65 + 273.2
The linear fit thus estimates maximum Gids to be 273 and charge time from empty to be 23.4 hours.
P.S. I took all data points, except 10.5-11.5. I also assumed that on the return trip the 7 and 8 hour data points were identical to those during the first trip.
Thanks for the confirmation. You took that snafu reading at 10.5 hours by the way. The data make that very clear.91040 said:Yes. The reading at Hour 7 and 8 was the same on the return trip. The snafu at 150Gids was due to my expectation that the Time to Charge would keep changing at 1/2 hour increments. I should be able to compare these numbers on trip tonight.
That is what I thought as well. Probably got confused by it being late, being tired and listening to the radio.lukati said:Thanks for the confirmation. You took that snafu reading at 10.5 hours by the way. The data make that very clear.91040 said:Yes. The reading at Hour 7 and 8 was the same on the return trip. The snafu at 150Gids was due to my expectation that the Time to Charge would keep changing at 1/2 hour increments. I should be able to compare these numbers on trip tonight.
arnolddeleon said:At end BayLEAFs gathering today someone shared a potentially awesome tip on a better (reverse) SOC meter that is already built-in to the car and can get read from the dash.
The idea is simply use the 110V time to 100% charge display. It is definitely a big improvement over the bars in that you get 1/2 hour steps it there are that are at least 22 steps (he said there are 24). It it turns to be 24 steps that means 4% steps, that would a huge improvement over the bars. I would be quite happy to get 2% steps (of course more steps would be better but the precision in the SOC may not be there anyway).
I have not heard about this tip in any of the discussion on the SOC meter (any my attempts to search for it didn't turn up any matches). I didn't get the person's name to give him proper credit.
arnold
yoyofella said:- except at the high end (near full charge), I've found the charge timer to be fairly well correlated to to our 12-bar SoC gauge.
Jack, good on you to bring this up at the meeting. I wish I was there to join in on the discussion, but I had to leave early.yoyofella said:- at the high end (full charge), the charge timer is not very accurate. I can drive 10 miles before the timer stop showing --:--
- after that, the time counts in 1 hour increments until the SoC bar goes to zero. I've gotten the timer to go as high as 22:00, but I'm too chicken to actually get to turtle so I don't know high high it displays.
- I find the timer very useful at the low end (near full discharge), as it maps about 2~3 hour per SoC bar, so gives me a peace of mind.
surfingslovak said:According to the dash, my Leaf expended nearly exactly 21 kWh to travel 107.1 miles:
21,000 Wh / 25 = 840 Wh (T120)
Thank you, Tony! Trip energy economy was 5.1 mpk. I posted the missing dashboard picture in the thread you have set up.TonyWilliams said:Congrats on induction into the 100 mile club. What was the miles/kWh ?
91040 said:More data.
Time to 100% Charge on 120V in relation to Gids:
Trip 1/ Return- 12/4/11. Trip 2- 12/5/11
1.5 hours - - - - - - - - - - 259 Gids
2 hours- 253 Gids - - - - 253
2.5 hours- 248 - - - - - - -249
3 hours- 240 - - - - - - -241
3.5 hours- 234 - - - - - - -233
4 hours- 228 - - - - - - -228
4.5 hours- 221 / 224 - - - 223
5 hours- 216 / 219 - - - 216
5.5 hours- 210 / 211 - - - 211
6 hours- 203 / 205 - - - 203
6.5 hours- 197 / 198 - - - 198
7 hours- 191 / same - - 191 (end of 1st leg of trip)
7.5 hours- 186 / 185 - - - 187
8 hours- 179 / same - - 182
8.5 hours- 172 / 175 - - -176
9 hours- 168 / 169 - - -169
9.5 hours- 160 / 161 - - -163
10 hours- 155 - - - - - - 155
11 hours- 150 - - - - - - 150
12 hours- 140 - - - - - - 139
13 hours- 122 - - - - - - 127
14 hours- 109 - - - - - - 111
15 hours- 99 - - - - - - - 101
16 hours- 87 - - - - - - - -88
17 hours- 79 - - - - - - - -78
18 hours- 65 - - - - - - - -69
19 hours- - - - - - - - - - - 49 (LBW just after)
20 hours- - - - - - - - - - - 33
21 hours- - - - - - - - - - - 23 (VLB same time)
No change- - - - - - - - - - - 7 Turtle
No change- - - - - - - - - - - 6 End
The drop seems inconsistent between 10 and 11 hours which is what confused me the first trip.
91040 said:More data.
Time to 100% Charge on 120V in relation to Gids:
Trip 1/ Return- 12/4/11. Trip 2- 12/5/11
1.5 hours - - - - - - - - - - 259 Gids
2 hours- 253 Gids - - - - 253
2.5 hours- 248 - - - - - - -249
3 hours- 240 - - - - - - -241
3.5 hours- 234 - - - - - - -233
4 hours- 228 - - - - - - -228
4.5 hours- 221 / 224 - - - 223
5 hours- 216 / 219 - - - 216
5.5 hours- 210 / 211 - - - 211
6 hours- 203 / 205 - - - 203
6.5 hours- 197 / 198 - - - 198
7 hours- 191 / same - - 191 (end of 1st leg of trip)
7.5 hours- 186 / 185 - - - 187
8 hours- 179 / same - - 182
8.5 hours- 172 / 175 - - -176
9 hours- 168 / 169 - - -169
9.5 hours- 160 / 161 - - -163
10 hours- 155 - - - - - - 155
11 hours- 150 - - - - - - 150
12 hours- 140 - - - - - - 139
13 hours- 122 - - - - - - 127
14 hours- 109 - - - - - - 111
15 hours- 99 - - - - - - - 101
16 hours- 87 - - - - - - - -88
17 hours- 79 - - - - - - - -78
18 hours- 65 - - - - - - - -69
19 hours- - - - - - - - - - - 49 (LBW just after)
20 hours- - - - - - - - - - - 33
21 hours- - - - - - - - - - - 23 (VLB same time)
No change- - - - - - - - - - - 7 Turtle
No change- - - - - - - - - - - 6 End
The drop seems inconsistent between 10 and 11 hours which is what confused me the first trip.
You meant 4.4% per hour, right? The gid value is around 11 or 12. Nice collaboration otherwise, this is really fun. Good luck with your new Leaf tomorrow! I received slightly diverging data the other night. I wish I had Gary's SOC meter, but perhaps I can borrow one locally for a test drive.lukati said:hat we need is another volunteer to see if the ~4.4 Gids/hour value holds true for other cars.
You guys are getting into turtle too often !surfingslovak said:So far, I have seen turtle mode kick in at 22 hours, 24 and 25 hours. It would likely have kicked in at 26 hours yesterday, if I kept driving. We need more data, obviously, but it's becoming clear that turtle mode cannot be correlated to an absolute value on the T120 gauge. The charging time display readout will have to be interpreted in relation to other data available on the dashboard.
surfingslovak said:I drove 79.7 miles on a charge with average trip economy of 3.9 mpk, which translates to 20.43 kWh expended. I was exactly 2 miles into the VLBW, and turtle was likely just around the corner. I did not want to stress the pack any further, especially since the ambient temperature dropped close to freezing.
evnow said:I think the more we dig, the more clear it gets why Nissan didn't want to give a numerical SOC meter.
lukati said:I will be using this SOC meter on my trip home from the dealer tomorrow. My first electric trip in the Chicago cold will be about 65 miles. Wish me luck!
Tony, you raise very good points. I found a dashboard picture from the trip, and it shows that the power rings did not start to retract. The temperature gauge had five bars, which means that its large thermal mass kept the pack warm. The Leaf is usually parked in a covered garage structure with about 55 F ambient temperature and the car wasn't exposed to the elements for more than four hours.TonyWilliams said:Were the "available power rings" (I don't know what else to call them) starting to retract? In other words, did you have one or two more miles available, or was turtle imminent? What do you think the battery temp was? You have 5 temp bars, so between 50F-74F-ish battery temp. Was it significantly warmer earlier, and the battery never had a chance to cool down? The bottom line, you're very close to the 21kWh usable for a 70F battery.
Enter your email address to join: