hate to burst your bubble, but many of us have found the 120 volt efficiency to be around 75% so you would have around 19.5 KWH used.awolfe63 wrote:Update:
Nissan tested my car - but I have received little feedback. The dealer indicated that a Nissan engineer would call me but despite 2 reminders, it has not happened. The communications through the dealer were unhelpful. They said that the problem was that I had the timer set to 80% and if I wanted more range I should just set it to 100%. I knew that. My concern was my total battery capacity.
However, since then I have done some more testing and my results are very similar to everyone else's.
Ran battery down to 0 bars, "---" on miles-to-go, very low battery warning.
Charged on 120 through a Kill-a-Watt to 100%.
Kill-a-Watt read 25.95 kWh. Pretty similar to what others have seen. If the charger is 85% efficient, that is 22kWh usable. It definitely is not near 18kWh as I had feared. As others have noted, both the bars remaining and the miles-to-go appear to be very non-linear.
Also - I got about 6-7 more miles when the readout read 4 miles-to-go and Carwings reported that I still had a range of 2.
Wow, if it's that bad, then it explains the difference between my driving mi/kWh and consumed mi/kWh. I just posted on that in the "Owners what range" thread. I have 2 weeks worth of data.Ingineer wrote: I would assume the LEAF's on-board charger is somewhere from 80%-90% efficient. I seriously doubt it's over 90%! So take that into account as well. The energy going in is always more than coming out!
This was mentioned long ago in this thread, and is something that few have considered (it seems) since that post (regarding wall to wheels power usage):planet4ever wrote:I won't bore you with all the data, but here is the bottom line for this post:
(42.0 miles) / (5.0 m/kWh) = 8.2 kWh
- Starting condition: Fully charged with unmodified Nissan L1 EVSE, reset trip odometer and m/kWh meter in dash.
- Ending condition: 42.0 miles, 5.0 m/kWh, 7 SoC bars (fifth one lost at 39.9 miles).
- Recharge: To full charge (after 3 charging lights in the car went off), same L1 EVSE through Kill A Watt, 11.04 kWh.
(8.2 kWh) / (11.04 kWh) = 74%
Either Dave's and my Kill A Watts are both grossly inaccurate, or the m/kWh meter in the dash is grossly inaccurate or the charger is grossly inefficient at 120v.
I find it impossible to keep track of how many miles I get per bar. But using all the information here - I now have a very good idea of my range based on the m/kwh I'm getting in any trip.LEAFguy wrote:Said another way - I don't care if my car has an 18, 19, or 20 gallon gas tank. Based on my driving style, I can see how fast I am depleting my gasoline supply by looking at the gas gauge. While the LEAF offers only a crude equivalent to the gas gauge (12 bars), if over 2 months worth of driving, I average 5 to 6 miles per bar, I can reasonably expect to continue to get 5 to 6 miles per bar. I don't really care how big the "tank" is. There should be a way to turn off the miles remaining display, as it is worse than useless, inspiring false confidence - especially in those expecting it to be accurate.
Or your assumption about bars is wrong.JessEV wrote:Basically, I'm seeing 2.2 to 2.5 miles/kWh resulting in a total real range for me of 50 miles.
OR, the battery pack isn't 24kWh.
Yes I was going to add that explanation tomorrow... But since you mentioned itevnow wrote:Or your assumption about bars is wrong.JessEV wrote:Basically, I'm seeing 2.2 to 2.5 miles/kWh resulting in a total real range for me of 50 miles.
OR, the battery pack isn't 24kWh.
I'm ok with the efficiency numbers for typical power supplies and chargers, but the 350w fixed overhead sounds a bit too high.. but in any case is all a case of circular logic since NO ONE has measured the wattage going in and out of the battery while being charged.. who will be the first dedicated Lead owner to actually make some measurements?DaveinOlyWA wrote: hate to burst your bubble, but many of us have found the 120 volt efficiency to be around 75% so you would have around 19.5 KWH used.
... i am looking at a charging efficiency of probably 88-90% then a set overhead for the charge management (which should be small) and cooling system which is small but still significant.
so the longer the charge time, the greater the hit on the overall charging efficiency. most have seen 85-88% on 240, around 75% on 120.