CAC increased, ideal miles decreased

[wiztecy]

So just to add some more oddity into the mix, I've also seen ideal miles drop as my CAC has increased. I also believe that ideal miles gets recalculated after a long drive where CAC gets recalibrated upon an 80%+ charge and also a second time after you draw off that 80%+ SOC down to 65-70% and let it sit for at least a 1/2 a day.

 

[asgard]

How are you folks getting 200+ actual miles on a standard charge?
All city driving with a few stop-and-goes?
I can't ever seem to beat the ideal miles and am lucky if I get 80% of ideal by staying below 60mph.

 

[hcsharp]

I've often suspected a relationship like dhrivnak discovered. It's interesting to see some real data.

I was worried for a while when my car started having one brick that was always lower voltage than all the rest. It varies from .02 to .04 v lower than the average. It's always brick #1. But it's almost never the lowest Ah brick retrieved from the logs. I think the roadster has some intelligence that cycles different bricks into and out of the lowest Ah position to help maintain near equal capacity. In other words, I think it does some balancing by voltage in addition to balancing by Ah. That might account for some of the daily variations in ideal range.

Does anyone else have one brick that is always lower voltage?

 

[djp]

Does anyone else have one brick that is always lower voltage?

Yes, my #19 is usually a lower voltage than the rest, but not consistently. I haven't checked the Ah for that brick.

 

[djp]

How are you folks getting 200+ actual miles on a standard charge?
All city driving with a few stop-and-goes?
I can't ever seem to beat the ideal miles and am lucky if I get 80% of ideal by staying below 60mph.

I can usually beat ideal range if I drive at a constant speed under 60mph with a tail wind and no elevation changes. City driving has too much start/stop acceleration to beat ideal.

Dhrivnak's scatter plot isn't 200 miles of actual range, but 200 miles estimated, which is a lot easier to do since the estimate only looks at the last 25 miles or so of driving. If you coast home downhill then charge up you'll have a high estimated range.

 

[thefortunes]

Yes, my #19 is usually a lower voltage than the rest, but not consistently. I haven't checked the Ah for that brick.

Newbie question...I see in the logs that my lowest brick is changing regularly (which is good) but how do you see voltage and Ah by brick?



P.S. I get a nice visual of ideal and estimated range on a daily basis. Here are my averages since I bought the car 2 months ago:

..............................................Distance Avg Speed Ideal Miles Used Estimated Miles Used
Morning commute (freeway) .......57 miles ..70 mph ....65 miles ..............70 miles
Evening commute (county roads) 53 miles ..55 mph ....56 miles ..............48 miles Note the last 5 miles are thru town and I typically have MORE estimated miles than ideal miles when I arrive home.

 

[blavenn]

I can only see my daily lowest Brick and min and avg Ah daily, how do you see the voltage for each brick?

 

[asgard]

I can only see my daily lowest Brick and min and avg Ah daily, how do you see the voltage for each brick?

Is this on the OVMS app?

 

[markwj]

Is this on the OVMS app?

Nope. Probably DIAG screen in the car. It can show lowest and highest brick voltages, but not individual.

 

[asgard]

Nope. Probably DIAG screen in the car. It can show lowest and highest brick voltages, but not individual.

Thanks. How do you get to the diag screen?

 

[blavenn]

I'm getting the lowest brick value and average CAC from the VMSParser app by Tom Saxton