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Re: Report Your Gid Number at 100% Charge

Posted: Tue Apr 03, 2012 8:37 am
by Ingineer
TonyWilliams wrote:
DaveinOlyWA wrote: i was averaging .23 to .28 miles per GID....

i tried to monitor GID in town but the range on that was between .22 and .35 which was too much.
So, 281 Gids / 80 miles equals 3.5 Gids per mile.
Or 280 watt-hours per mile. (1 Gid = 80 watt-hours.)

-Phil

Re: Report Your Gid Number at 100% Charge

Posted: Tue Apr 03, 2012 9:28 am
by garygid
80 watt-hours per GID, according to Nissan (source?).

Did Nissan say where these watt-hours are measured?

The wall, the charger input, the charger output,
going into the Pack, inside the Pack ... ?

These figures will all be (slightly to noticably) different.

It appears that a GID is NOT 80 watt-hours of usable energy
being recovered from the Pack to be used by the car, right?

Re: Report Your Gid Number at 100% Charge

Posted: Tue Apr 03, 2012 9:59 am
by Ingineer
80 watt-hours measured at the hall-effect coulomb counter. Obviously there is some amount of efficiency lost from charge to discharge due to the coulombic loss. The LBC (Battery ECU) will periodically correct the numbers to keep them accurate. You'll see this on occasion as a rapidly moving SoC/Gids with no significant load. I tend to observe this right after starting from a charge, but it levels off quickly. It also will sometimes correct with a "jump" during start-up when needed.

-Phil

Re: Report Your Gid Number at 100% Charge

Posted: Tue Apr 03, 2012 10:17 am
by TickTock
garygid wrote:80 watt-hours per GID, according to Nissan (source?).

Did Nissan say where these watt-hours are measured?

The wall, the charger input, the charger output,
going into the Pack, inside the Pack ... ?

These figures will all be (slightly to noticably) different.

It appears that a GID is NOT 80 watt-hours of usable energy
being recovered from the Pack to be used by the car, right?
Yes. I get 80 Wh into the battery only during charging. When driving/discharging, it appears to be around 75 Wh.

Re: Report Your Gid Number at 100% Charge

Posted: Tue Apr 03, 2012 12:53 pm
by TonyWilliams
Ingineer wrote:
TonyWilliams wrote:
DaveinOlyWA wrote: i was averaging .23 to .28 miles per GID....

i tried to monitor GID in town but the range on that was between .22 and .35 which was too much.
So, 281 Gids / 80 miles equals 3.5 Gids per mile.
Or 280 watt-hours per mile. (1 Gid = 80 watt-hours.)

-Phil
Phil, I get that you are providing the data that Nissan has provided, and Im confident that it is very useful for many things. For making calculations based on the available instruments to the causal LEAF operator (without LEAFSCAN, Consult XXXX, etc), it doesn't add up.

So, while I'm not disputing your source, 80 watt-hours has little meaning to that casual driver. I find it closer to 73-75 watts-hours of USEFUL, observed by the instruments in the vehicle, energy per Gid.

Re: Report Your Gid Number at 100% Charge

Posted: Wed Apr 04, 2012 9:25 am
by Ingineer
TonyWilliams wrote:Phil, I get that you are providing the data that Nissan has provided, and Im confident that it is very useful for many things. For making calculations based on the available instruments to the causal LEAF operator (without LEAFSCAN, Consult XXXX, etc), it doesn't add up.

So, while I'm not disputing your source, 80 watt-hours has little meaning to that casual driver. I find it closer to 73-75 watts-hours of USEFUL, observed by the instruments in the vehicle, energy per Gid.
Keep in mind, all the instruments in the vehicle use this watt-hour figure (or the higher resolution version) for calculation of everything they display. So I respectfully disagree with you.

-Phil

Re: Report Your Gid Number at 100% Charge

Posted: Thu Apr 05, 2012 2:31 am
by TonyWilliams
Ingineer wrote:
TonyWilliams wrote:Phil, I get that you are providing the data that Nissan has provided, and Im confident that it is very useful for many things. For making calculations based on the available instruments to the causal LEAF operator (without LEAFSCAN, Consult XXXX, etc), it doesn't add up.

So, while I'm not disputing your source, 80 watt-hours has little meaning to that casual driver. I find it closer to 73-75 watts-hours of USEFUL, observed by the instruments in the vehicle, energy per Gid.
Keep in mind, all the instruments in the vehicle use this watt-hour figure (or the higher resolution version) for calculation of everything they display. So I respectfully disagree with you.

-Phil
How do we account for, and resolve the discrepancies between the 80 published number and the 75 observed by the operator (me, and anybody with a Gidmeter) ?

Re: Report Your Gid Number at 100% Charge

Posted: Thu Apr 05, 2012 6:57 am
by mckemie
I just charged to 100% after receiving my SOC meter a few ways ago. 256. Slightly alarming. Range has always seemed acceptable. We now have 14k miles and charged to 100% for the first 10-12k miles. Then, it dawned on me that 80% would suffice for most of our trips. We now charge to 100% only about once a week. Indicated range (trip distance plus SMRD reading) is 90-95 miles on a full charge. That makes maximum range (to turtle) 95-105 miles.

If the gid really represents energy in the battery, I am 10-12% low.

Re: Report Your Gid Number at 100% Charge

Posted: Thu Apr 05, 2012 7:16 am
by Stoaty
mckemie wrote:I just charged to 100% after receiving my SOC meter a few ways ago. 256.
You may want to post your info in this thread also:

http://www.mynissanleaf.com/viewtopic.php?f=31&t=8331" onclick="window.open(this.href);return false;

Re: Report Your Gid Number at 100% Charge

Posted: Thu Apr 05, 2012 7:55 am
by DaveinOlyWA
TonyWilliams wrote:
Ingineer wrote:
TonyWilliams wrote:Phil, I get that you are providing the data that Nissan has provided, and Im confident that it is very useful for many things. For making calculations based on the available instruments to the causal LEAF operator (without LEAFSCAN, Consult XXXX, etc), it doesn't add up.

So, while I'm not disputing your source, 80 watt-hours has little meaning to that casual driver. I find it closer to 73-75 watts-hours of USEFUL, observed by the instruments in the vehicle, energy per Gid.
Keep in mind, all the instruments in the vehicle use this watt-hour figure (or the higher resolution version) for calculation of everything they display. So I respectfully disagree with you.

-Phil
How do we account for, and resolve the discrepancies between the 80 published number and the 75 observed by the operator (me, and anybody with a Gidmeter) ?
how are you measuring this Tony? i see it wind down from 280 every morning and that is all the info i get from it. sometimes its every .2 miles or .3 or whatever. but other than that, i have no way of knowing if its 80 watts or any other wattage?