EricBayArea wrote:Great video, thanks!
I have some questions and assumptions about some components you explain. Was hoping you could confirm or educate me:
First Screen
1) GID - This is the # out of 281 (for a brand new battery pack)?
2) SOC % - For a pack with 95% heath, would this show "100%" if I charged fully using "100%" setting?
3) GID % - For a pack with 95% heath, would this show "95%" if I charged fully using "100%" setting?
4) Ah% - Shouldn't this show the same as #2 or #3?
Second Screen
Health - Would this be the same as the GID % if I charged fully using "100%" setting?
Other
Is there a screen/setting that shows the number of Kw's the motor is putting out or putting in? Similar to the Energy Screen that car has built in? I heard that the regen shown by the car is not always accurate and maxes out on the circular graph at a lesser number than the car actually is collecting.
With all that said, it looks like you did a great job - can't wait to get my hands on it and fret even more about the battery in my LEAF
Thanks! Sure thing..
Page 1:
1: Yes, raw Gids from the EV-CAN bus. Although there is nothing magic about 281. Many of the new 2013s can charge to 282-284. I saw 281 on my new 2012 only a few times. Now best I see is 270-272.
2: The true SOC will be 80% at 80% and about 95% at "full". Regardless of your battery capacity. Ie each percent shrinks over the years as your pack loses capacity (if you're in a warm climate).
3: This is just Gids * .356... 281 or higher will cap at 99.99%. Just a convenience for those brought up on the old Gid meters.
4: it's #2 * your pack capacity. So if you have a 66Ah pack capacity and charge to 80% SOC, this will be 52.8Ah... The idea was to have a constant unit (like Gids) but with more precision and less hysteresis (ie, you get credit for regen!). While its fun to look at, I still find myself going back to good ole Gids..
Page 2:
Health would be more precise than trying to use Gids in theory. Amp hour Capacity may ultimately be best. I found the "health" number in the Group 1 active CAN data and on all the 2011/12 cars it seems to be a "% of new" capacity.. My car was 66.1Ah new and showed just over 100% health. Now it's around 63.5Ah (if memory serves) and about 95% health. Oddly the two 2013s I've tried so far showed 67.3Ah capacity and 111% and 115% health.. ??? It'll be interesting to see what others get as we get more units in the field.
And yes, it doesn't show kW (Vpack * Amps), but it prominently shows Amps at the top. It takes slightly more Amps to get the same power at lower SOCs but it's similar and fun to watch. Especially alongside the pack voltage "dot".. As you use power and Amps grow from the top left corner you see the voltage dot dip right also.. Similarly with strong regen or DCQC (like the video) the Amps grows from top right and you see the voltage spike up to the left slightly. The Vpack dot becomes a lot more important at lower SOCs (like below VLBW). At some point near the bottom of charge the voltage becomes more important than SOC, Gids or anything.. I guess at the very bottom you're better off on Page 3
