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Re: I want my 281!

Posted: Thu Sep 08, 2011 8:22 pm
by aqn
Sorry, but I have to say that all this strikes me as possibly a bit like trying to measure a rubber band (a CAN-bus number seemingly related to the battery's state of charge) with a micrometer (the SoC meter).

Re: I want my 281!

Posted: Fri Sep 09, 2011 7:13 am
by garygid
Any chance you three with meters (Mike, Boomer, Tony) are
leaving some load turned on?

Even IF the SOC-Meter is left switched to Always-ON, it is not a BIG load.
It could be a 1/4 amp x 12v x 12 hour load (3 amp-hour x 12v) = 36 watt-hour, or only 0.036 kWh overnight.

Or, pre-cooling at 100% might drain the battery a bit.

Or, if even one cell-pair had an unexpectedly high "internal resistance", the 100% charging MIGHT terminate a bit early.

What is the Battery Pack voltage reported by SOC-Meter F1.08?

Perhaps logging a charging session AND several hours after will tell us the story.

Re: I want my 281!

Posted: Fri Sep 09, 2011 7:39 am
by TomT
For the first time in quite a while, I charged to 100 percent the night before since I had a lot of driving to do yesterday. I was presented with 12 bars and the first disappeared at about 6.6 miles (it's downhill from my house) as it always has in the past. So, at 7,000 miles, I see no real difference in battery performance that I can yet detect.

Re: I want my 281!

Posted: Fri Sep 09, 2011 8:03 am
by garygid
TomT,
Yep, Thanks.
Your description would seem to be the normal / good / expected 100% charge and top-Bar usage experience (with noticably less distance than other mid-range Bars).

A very few others appear to be observing a less-full top-Bar.

Re: I want my 281!

Posted: Fri Sep 09, 2011 8:18 am
by garygid
I just went out to read the SOC-Meter after an overnight charge to 100%.

97.1% (273 raw) 393.5 volts

I have previously had over 99%, and normally not less than 98%, but I have been doing a lot of charging to 80%.

Re: I want my 281!

Posted: Fri Sep 09, 2011 8:55 am
by Boomer23
garygid wrote:Any chance you three with meters (Mike, Boomer, Tony) are
leaving some load turned on?

Even IF the SOC-Meter is left switched to Always-ON, it is not a BIG load.
It could be a 1/4 amp x 12v x 12 hour load (3 amp-hour x 12v) = 36 watt-hour, or only 0.036 kWh overnight.

Or, pre-cooling at 100% might drain the battery a bit.

Or, if even one cell-pair had an unexpectedly high "internal resistance", the 100% charging MIGHT terminate a bit early.

What is the Battery Pack voltage reported by SOC-Meter F1.08?

Perhaps logging a charging session AND several hours after will tell us the story.
No loads were left on nor pre-cooling
This morning's readings after a 100% charge, 8.5 kWh, 2 hours 18 minutes of charging:
Bars = 12
SOC # = 274
SOC % = 97.5
Pack volts = 393

I'm thinking that it's an ambient temperature thing.

Re: I want my 281!

Posted: Fri Sep 09, 2011 10:40 am
by 91040
All 80% charges. All using my Blink (except the second one on the 8th). All reading 388.5 Battery pack voltage.

9/6 77.5%/218 raw
9/7 77.5%/218 raw
9/8 77.2%/217 raw
...... 77.5%/218 raw
9/9 78.6%/221 raw

I am very sure a week prior, I was getting 80% or slightly above readings. I think temperature is involved but don't understand why the car would not charge to the same raw number. Doesn't a warmer battery have more capacity (up to a point)? I guess this shows that we don't know what the raw number actually represents.

PS. Should we call the units for the raw number "gids"? :lol:

Re: I want my 281!

Posted: Fri Sep 09, 2011 10:44 am
by TonyWilliams
91040 wrote: PS. Should we call the units for the raw number "gids"? :lol:
I just refer to it as "Battery Raw Data Value".

I'm going to stop calling the percentage of this value as % battery. It's a 100 point index of the Raw Data.

Re: I want my 281!

Posted: Fri Sep 09, 2011 10:48 am
by Stoaty
91040 wrote:PS. Should we call the units for the raw number "gids"? :lol:
"I will have to get one of these meters so I can see how many gids I am getting on an 80% charge."

Rolls off the tongue very nicely--gets my vote!

Re: I want my 281!

Posted: Fri Sep 09, 2011 2:27 pm
by garygid
Stoaty,
Are you coming to the Gathering at HTB in Cerritos tomorrow morning?

At the moment I have 2 SOC-Meter Kits available, which I will bring to the Gathering.

Do you want Red or Blue LED digits?
The Logging Port Option?