Sudden decrease in Ideal Mileage

[cgloewen]

So a 2010 2.5 Sport, mostly a Sunday Driver. Typically see ideal mileage of around 170 - 175 range. In the past month, the ideal has dropped to 82! The charge bar looks like half charged, so it appears to just need a charge. Range mode bumps it up a bit, not much. CAC shows 142. Any ideas?

 

[im4uttx]

Has the CAC changed in the last month? Ideal just reports what the current charge will get you, so if it needs a charge, can't really base what the ideal number is...unless it won't charge above the current number, which could mean a bad battery sheet...

 

[cgloewen]

I can't remember the last time I looked at the CAC, so I don't know if it has declined too. Attached is a photo of the ESS SOC, is there a log that shows the CAC values?

 

[im4uttx]

Looks like a bad sheet...the min/max should be within a few %, not 46%-83%, or could just need balanced, but that is a pretty steep difference. Pull the logs and check the history for the worst sheet and it's charge when "full"

The are some better experts and some other threads...

 

[cgloewen]

Ouch... but thanks! I fear the worst.

 

[markwj]

I can't remember the last time I looked at the CAC, so I don't know if it has declined too. Attached is a photo of the ESS SOC, is there a log that shows the CAC values?

Looks like one or more bad bricks pulling things down. The charge stops when SOC MAX hits the limit, but your displayed SOC / range is limited by SOC MIN.

If you grab the logs, you can have a look at the text file with brick voltages. Should be able to see if it is one or more that are off from the others.

It could also be a bad voltage reading from the BMB, but much more likely to be the brick itself.

Regards, Mark.