SOC at 82.4%
#21
01-28-2008, 09:51 PM
Hybrid and Ethanol Expert
Join Date: Mar 2005
Location: All over the Central U.S.
Posts: 3,616
Re: SOC at 82.4%
Yes. CHARGE is considered negative battery amps, so I included that in my name, and added the arrow to remind me. That IS the same as MxC.
That means 28.0 amps was allowed IF I hit the brakes. It was not the actual amps at that moment. Max allowed ever is about 55 amps.
MDV is the difference between banks of cells.
Since it is one number, and there are many cell 'modules' it is either:
A) the largest imbalance
B) the average imbalance
It's probably A) but I forget it's been so long.
My number was ALWAYS 0.00 before the battery harness recall.
Now, I get various numbers in these moves:
0.05, 0.11, 0.17
Usually when the pack is idle, I have 0.05.
Usually when the pack is under load ( either way ) it is 0.11.
Only rarely is it 0.17.
This is only after the recall work was done.
And I only have 3 days of ovservations since.
-John
That means 28.0 amps was allowed IF I hit the brakes. It was not the actual amps at that moment. Max allowed ever is about 55 amps.
MDV is the difference between banks of cells.
Since it is one number, and there are many cell 'modules' it is either:
A) the largest imbalance
B) the average imbalance
It's probably A) but I forget it's been so long.
My number was ALWAYS 0.00 before the battery harness recall.
Now, I get various numbers in these moves:
0.05, 0.11, 0.17
Usually when the pack is idle, I have 0.05.
Usually when the pack is under load ( either way ) it is 0.11.
Only rarely is it 0.17.
This is only after the recall work was done.
And I only have 3 days of ovservations since.
-John
#22
01-28-2008, 10:52 PM
Re: SOC at 82.4%
Thanks, John. I'm trying to see which of the other pid's might be of use to me. I'm currently using SoC, and cFE (current ave mpg). I also have CTH and HV Battery Temp set up as xgauges.
I'm not sure I'd get much use out of MDV. I am thinking MxD might be useful if that's a measure of how much the battery is willing to give while in EV. Would the max discharge rate give me some idea of how hard I could accelerate EV without the ICE coming back on?
Sorry, not trying to hi-jack the tread
... just trying to learn!
FYI - Here is what I usually have dialed up on my SGII's:
https://www.greenhybrid.com/share/fi..._SGIIs_FEH.jpg
Thanks,
Rick
I'm not sure I'd get much use out of MDV. I am thinking MxD might be useful if that's a measure of how much the battery is willing to give while in EV. Would the max discharge rate give me some idea of how hard I could accelerate EV without the ICE coming back on?
Sorry, not trying to hi-jack the tread
... just trying to learn!FYI - Here is what I usually have dialed up on my SGII's:
https://www.greenhybrid.com/share/fi..._SGIIs_FEH.jpg
Thanks,
Rick
#23
01-29-2008, 07:27 AM
Hybrid and Ethanol Expert
Join Date: Mar 2005
Location: All over the Central U.S.
Posts: 3,616
Re: SOC at 82.4%
Yes... in general... MxD should tell you how much you can pull in EV.
There is pretty much a linear relationship of amps to temperature.
Oh... but if in EV, you need some 'reserve' to start the car...
So reduce the total by about one-third.
72 amps is allowed to dischage at ~95'F and it starts going down at 'about' 10 amps loss per 30 degree loss.
Going hotter than 95'F you start losing amps also.
There is pretty much a linear relationship of amps to temperature.
Oh... but if in EV, you need some 'reserve' to start the car...
So reduce the total by about one-third.
72 amps is allowed to dischage at ~95'F and it starts going down at 'about' 10 amps loss per 30 degree loss.
Going hotter than 95'F you start losing amps also.
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