am I correct to map the KWH to the bar? chargepoint wrong?

I tried to understand the GID vs KWH chart of this forum, am I correct to generate the follow table based the chart:

GIDs kwh each_bar
=====================
281 22.48 1.92=bar12
257 20.56 1.68=bar11
236 18.88 1.36=bar10
219 17.52 1.6
199 15.92 1.04
186 14.88 1.84
163 13.04 1.6
143 11.44 1.68
122 9.76 1.6
102 8.16 1.12
88 7.04 1.2=bar2
73 5.84 1.92=bar1
49 3.92 1.92
25 2 1.68
==============
kwh=0.08GIDs
==============

However when I use the chargepoint to charge my leaf, the KWH reported from chargepoint does not match the above table. Am I doing something wrong?

Thanks in advance.

Not all of the energy that comes out of the wall/J1772 handle makes it into the battery.

There's are some charging losses, including some fixed overheard like running the pumps. Some efficiency figures were given at http://www.mynissanleaf.com/viewtopic.php?p=155305#p155305" onclick="window.open(this.href);return false;, before the '13+ Leaf came out w/the 6 kW OBC. When charging at ~27.5 amps, there should be less charging loss since the fixed overhead doesn't need to run as long.

However, if you charge to 100%, in the last 5-8% or so, charging rate slows down and there's will be some bounces at the end. I'm not sure how much of that time the pumps run (some of fixed overhead).

thank you for your reply. I went to your link, so they said there is around 80% efficiency. I will have to calculate the real KWH I got.

What about the relative distribution of the mapping? For example, should Bar8 really be 1.04 KWH?

cwerdna said:

Not all of the energy that comes out of the wall/J1772 handle makes it into the battery.

There's are some charging losses, including some fixed overheard like running the pumps. Some efficiency figures were given at http://www.mynissanleaf.com/viewtopic.php?p=155305#p155305" onclick="window.open(this.href);return false;, before the '13+ Leaf came out w/the 6 kW OBC. When charging at ~27.5 amps, there should be less charging loss since the fixed overhead doesn't need to run as long.

However, if you charge to 100%, in the last 5-8% or so, charging rate slows down and there's will be some bounces at the end. I'm not sure how much of that time the pumps run (some of fixed overhead).

Click to expand...

Mapping the kwh to the car may be a way for a new owner to understand how things work, but I would think that would just get muddy over time as the car loses capacity. The 12 fuel gauge bars will always indicate fully empty to completely full, but the amount of total kwh over time drops as the battery ages. So even if you can figure out what each bar is worth in terms of kwh now, it will change as the car ages...

I have heard that if the 12-bar becomes 11-bar, then Nissan would replace your battery because of the warranty. If the 12-bar always stays at 12-bar, how does warranty work?

Randy said:

Mapping the kwh to the car may be a way for a new owner to understand how things work, but I would think that would just get muddy over time as the car loses capacity. The 12 fuel gauge bars will always indicate fully empty to completely full, but the amount of total kwh over time drops as the battery ages. So even if you can figure out what each bar is worth in terms of kwh now, it will change as the car ages...

Click to expand...

fetv said:

I have heard that if the 12-bar becomes 11-bar, then Nissan would replace your battery because of the warranty. If the 12-bar always stays at 12-bar, how does warranty work?

Click to expand...

No. You need to have lost 4 capacity bars within 5 years/60K miles to qualify for a free replacement under warranty: http://www.mynissanleaf.com/viewtopic.php?f=4&t=13192" onclick="window.open(this.href);return false;.

http://www.electricvehiclewiki.com/File:Scott_3_bars_s.jpg" onclick="window.open(this.href);return false; shows a picture of a 3 capacity bar loser.

The "fuel bars" (wider ones on the right side, to the left of the narrow capacity bars) will still all fill up to the top at 100% charge, regardless of how much capacity has been lost. The above picture shows that.

Thank you for the link of the 3-bar image. So the wider bar is just like the marks on the non-EV car and the narrow bars is the "needle" of a non-ev car.

Since I don't have a GID meter, if the bar is not good of KWH indication to estimate either how many miles remaining or how long I need to charge to reach my destination, then what do people suggest that I should do?

Thanks.

cwerdna said:

fetv said:

I have heard that if the 12-bar becomes 11-bar, then Nissan would replace your battery because of the warranty. If the 12-bar always stays at 12-bar, how does warranty work?

Click to expand...

No. You need to have lost 4 capacity bars within 5 years/60K miles to qualify for a free replacement under warranty: http://www.mynissanleaf.com/viewtopic.php?f=4&t=13192" onclick="window.open(this.href);return false;.

http://www.electricvehiclewiki.com/File:Scott_3_bars_s.jpg" onclick="window.open(this.href);return false; shows a picture of a 3 capacity bar loser.

The "fuel bars" (wider ones on the right side, to the left of the narrow capacity bars) will still all fill up to the top at 100% charge, regardless of how much capacity has been lost. The above picture shows that.

Click to expand...

fetv said:

Thank you for the link of the 3-bar image. So the wider bar is just like the marks on the non-EV car and the narrow bars is the "needle" of a non-ev car.

Click to expand...

Yes on the wider bars.

As for narrow bars == needle.... hmm, not really. Think of those narrow bars representing how big the gas tank is, which shrinks as the battery degrades. Unfortunately, it takes WAY more loss for the 1st CB to vanish than the others. See http://www.electricvehiclewiki.com/Battery#Battery_Capacity_Behavior" onclick="window.open(this.href);return false;. Those values were supposedly in the service manual, but then Nissan removed it, w/no explanation given.

fetv said:

Since I don't have a GID meter, if the bar is not good of KWH indication to estimate either how many miles remaining or how long I need to charge to reach my destination, then what do people suggest that I should do?

Click to expand...

You can use the range chart at http://www.mynissanleaf.com/viewtopic.php?p=101293" onclick="window.open(this.href);return false;. If you go 35 mph or achieve an avg of 6.3 miles/kwh on level ground, no HVAC, no wind, etc., you should be able to go 132 miles on a 100% charge on a new battery. Edmunds did: http://www.edmunds.com/nissan/leaf/2011/long-term-road-test/2011-nissan-leaf-driving-it-to-the-bitter-end.html" onclick="window.open(this.href);return false;.

If you go 75 mph, then you can go ~62 miles.

You will need to use the other charts further down to account for degradation. The chart was created before the '13 Leaf, which added the % SoC screen in the dash b&w display.

cwerdna said:

You can use the range chart at http://www.mynissanleaf.com/viewtopic.php?p=101293" onclick="window.open(this.href);return false;. If you go 35 mph or achieve an avg of 6.3 miles/kwh on level ground, no HVAC, no wind, etc., you should be able to go 132 miles on a 100% charge on a new battery. Edmunds did: http://www.edmunds.com/nissan/leaf/2011/long-term-road-test/2011-nissan-leaf-driving-it-to-the-bitter-end.html" onclick="window.open(this.href);return false;.

If you go 75 mph, then you can go ~62 miles.

Click to expand...

...unless it's below 70(F) degrees ...as noted in the fine print on the charts.