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TonyWilliams
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Re: WattsLeft™ Monitor (Parallax SX28AC/DP SOC/CAN Project)

Thu Apr 18, 2013 7:18 pm

KillaWhat wrote: 19% and 56GID still showing.

Which leads me to a couple questions for the group.
At what point (GID's) does the car stop rolling?
Stop performing in a normal manner?
(maybe should have asked that first?)

And.... is the battery indicator just full of it?
0 bars and 19% left?

SOC%-"kWh usable" --Gid----Gid%--Gid2%---2013 dash %
95.x% -21.0--Full----281---100%---100%----100%
-------- 3.1---LBW----49---17.4%---15.3%----17%
---------1.3---VLB----24----8.6%-----6.2%----8%
2.x%-- 0.0---Turtle --7-----2.5%-----0%-----(---)

Turtle can be triggered between about 4 and 8 Gid. The car physically stops when the lowest cell pair hits the target low voltage, usually around 3-5 Gid (it can vary a lot... Get off the road at turtle).
Last edited by TonyWilliams on Thu Apr 18, 2013 9:37 pm, edited 1 time in total.

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DaveEV
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Re: WattsLeft™ Monitor (Parallax SX28AC/DP SOC/CAN Project)

Thu Apr 18, 2013 8:44 pm

KillaWhat wrote:But the Meter said I had 112GID, which sounded like I had plenty of E-fuel.
112 GID is about 1/2 a 80% charge to give you some perspective...
KillaWhat wrote:Arrived home with NO bars left, but the meter showed 19% and 56GID still showing.
Not even LBW!
KillaWhat wrote:At what point (GID's) does the car stop rolling?
Typically around 4 GIDs (See Tony's great chart above for all the good details)
KillaWhat wrote:Stop performing in a normal manner?
Turtle typically comes on around 5-7 GIDs depending on how hard you're driving, but power starts being restricted slightly before that. It would be safe to assume < 10 GIDs = restricted power. Note that I would recommend driving gently as get below LBW (49 GIDs) and as you approach VLBW (24 GIDs). Especially once you get below VLBW I'd be as gentle as possible. It's tough on the battery to be discharged quickly when SOC is low.
KillaWhat wrote:And.... is the battery indicator just full of it?
0 bars and 19% left?
The battery gauge used to be more optimistic until the the first LEAF owners started Brodering the car on the side of the road in somewhat large numbers. Making the meter pessimistic at the bottom has largely alleviated that issue, at the expensive of making it appear to the normal user that range is lower than it really is.

KillaWhat
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Re: WattsLeft™ Monitor (Parallax SX28AC/DP SOC/CAN Project)

Thu Apr 18, 2013 10:44 pm

Thank you.
This ability to ACTUALLY see what's really happening is a game changer.
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DarkStar
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Re: WattsLeft™ Monitor (Parallax SX28AC/DP SOC/CAN Project)

Fri Apr 19, 2013 8:36 am

KillaWhat wrote:Thank you.
This ability to ACTUALLY see what's really happening is a game changer.
I couldn't agree more! Before WattsLeft™ :D, once I was down to two bars I would turn off the heater and go into my "hypermile" mode. Now I find myself actually being less efficient, but has made driving a lot more relaxing.

As drees stated, once you get down to three bars, Nissan starts being ultra pessimistic, with the GOM and SOC deviating by a greater degree.
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Turbo3
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Re: WattsLeft™ Monitor (Parallax SX28AC/DP SOC/CAN Project)

Fri Apr 19, 2013 10:52 am

KillaWhat wrote:Well I did something new tonight.
With my new Wattsleft meter installed, I headed out for a 20 mile trip with 3 battery bars ...

Image
I am impressed. You did the rearview mirror install. Now that it is getting hotter here I had to go back to adding the metal hook I made to keep my WattsLeft up as the glue would soften and the unit drop down. If you go back many pages you can see what the hook looks like.

Actually, I don't even recall sending you the detailed instructions on how to do it.

KillaWhat
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Re: WattsLeft™ Monitor (Parallax SX28AC/DP SOC/CAN Project)

Sun Apr 21, 2013 8:32 pm

If you go back many pages you can see what the hook looks like.
You are 100% correct.
The adhesive on the Velcro stuck to the headliner will not survive the first hot day.
I tried a trick I used to use when sticking things to carpeted areas In the past.
Just stick the "hook" part to the unit, and wiggle it into the headliner.
The headliner acts as the "loop" side.
Doesn't always work, but this seems to be OK.

It was 89F here yesterday, and damn hot in the black leaf I can tell you.
Everything held.

Loving the meter.

I held out for so long waiting for a Leafscan.......
Now the thread is locked with no explanation?
Black SL Delivered 3/14/2012
7.2Kw Charging w/Brusa
Leather Interior
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JUKE 17" Wheel Upgrade w/225-45-17 Michelin MXM4 Tires
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WattsLeft Meter System
LED High Beams
Carkit NAV Override

Luft
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Re: WattsLeft™ Monitor (Parallax SX28AC/DP SOC/CAN Project)

Thu Apr 25, 2013 3:59 pm

My email has been sent. I hope Turbo has the time to get a meter to me before the Rally in late June. :D
Luft
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Luft
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Re: WattsLeft™ Monitor (Parallax SX28AC/DP SOC/CAN Project)

Mon Apr 29, 2013 11:44 pm

Just got my meter today. Damn you Turbo! Now I'll have to change all of my rally driving logs from fuel bars to gids! :lol:

What affects the max gid value besides battery degradation? Does temperature and/or cell imbalance?

BTW It looks great!
Luft
Tenino, Washington
Red SL + QC
Reserved: 05/10/2011
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Estimated Delivery Date: Month of August 2011
Delivered September 17, 2011
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surfingslovak
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Re: WattsLeft™ Monitor (Parallax SX28AC/DP SOC/CAN Project)

Mon Apr 29, 2013 11:59 pm

Luft wrote:Does temperature and/or cell imbalance?
Yes -- both. Good on you to get Jim's meter, it's one of the most well thought-out solutions available today.

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garygid
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Re: WattsLeft™ Monitor (Parallax SX28AC/DP SOC/CAN Project)

Tue Apr 30, 2013 8:00 am

If the cells are not well equalized, the battery pack cannot
be charged as much as would otherwise be possible.

At higher and lower temperatures, the car's BMS will be
more conservative, and not fill the Battery Pack as full
as it would at "nominal" temperatures, primarily to
better protect the battery cells from damage.

With real diminished capacity, the Battery Pack cannot
hold as much energy as it previously could.

These three major factors combine to give lower
GID values when the Battery is "full".
See SOC/GID-Meter and CAN-Do Info
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