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CAC of the original Roadster battery

gregd

Active Member
Dec 31, 2014
2,620
1,849
CM98
Checked today. My 2010 Roadster Sport has a CAC of 139.5. 60 000 KM.

Wasn't there a graph showing the CAC numbers of the original Roadster battery?
That is exactly what my car (also a 2010, but non-sport) has. 46k miles, 139.5 CAC. Standard charge comes in at about 163 miles. I think we're slightly on the lower side of normal, but still very much within the expected range.

I think the graph you are referring to is the battery survey that was conducted a few years ago, posted here: https://survey.pluginamerica.org/tesla-roadster/PIA-Roadster-Battery-Study.pdf
 
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gregd

Active Member
Dec 31, 2014
2,620
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CM98
I have a 2.5 2011 standard model

SOC: LIM 85% Min 85% MAX 88%
RR 172 Miles
My car has 60,000 km on it, with a CAC of 144.2 and charges in the morning at work on 32A and at night 10A standard charge to 136 Miles.
A CAC of 144.2 should Standard charge to something about 170 miles, not 136. You might want to look at the battery's cell balance, or do a discharge to 20%, followed by range charge, and see if that number improves. Something's not quite right.
 

supersnoop

Tesla Roadster #334
Mar 24, 2014
1,111
222
Pflugerville
I have a 2.5 2011 standard model

SOC: LIM 85% Min 85% MAX 88%
RR 172 Miles
My car has 60,000 km on it, with a CAC of 144.2 and charges in the morning at work on 32A and at night 10A standard charge to 136 Miles.
A CAC of 144.2 should Standard charge to something about 170 miles, not 136. You might want to look at the battery's cell balance, or do a discharge to 20%, followed by range charge, and see if that number improves. Something's not quite right.
That could be estimated instead of ideal miles. Or I could read that as it doesn’t fully charge overnight on 110v. Ironically, the 10a charge should result in a higher than expected range. All the more reason that CAC is the number to use.
 
Just took a screen shot
Ideal range is 172 miles
 

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