dhrivnak
Active Member
It appears that the range decline in my 3.0 battery is tapering off. I hope so if not it appears that the 3.0 gained me about 6 years of extra range.
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I was told an occasional Range charge is good for the 3.0 battery, or any lithium pack, as the range charge really helps with balancing. Definitely not a daily or even monthly occurrence but I do range charge on occasion. That said I have not been able to see any changes (good or bad) when I have range charged.About a year ago I picked up #613 which is a 2010 Roadster Sport with the 3.0 upgrade. I was the 2nd owner, and now again own it as the 4th owner (long story LOL) ---
According to my records:
3,422 miles at the time of the 3.0 upgrade
7,995 miles currently on the car
CAC was:
198.1 Ah in July 2018, with a mileage of 6,363 mi
185.x Ah now in May 2019, with a mileage of 7,995 mi
It has been a hot minute since I pulled the logs, and the parser was not one that I dealt with easily. That said... I see more recent activity in this thread and it seems there is some good data pulled that allowed users to make charts. Would someone (looking at you @bolosky ) want me to email them the log so they can add it to the charts? Please advise... I'd really love to see the data.
Really at this point I am just worried about long term battery health. Part of what made this car attractive to me as 2nd owner a year ago was the 3.0 battery, so I want to ensure I am doing what I can to maintain it healthily. At the moment I am back to standard charging it, but it did go through a bunch of Range charges (1,200 miles in 2018, and 850 miles in 2019) on some big road trips (I drove it from Florida to Ohio, and then from KC,MO to Ohio, both times I bought it haha)
TIA for any help/thoughts on this-- and maybe a link to help me get the logs/emailed to whomever wants to spend time analyzing them!
Range charging does at least two things for the 3.0 battery. One is that it balances better with a full charge than with a standard (80%) charge.I was told an occasional Range charge is good for the 3.0 battery, or any lithium pack, as the range charge really helps with balancing. Definitely not a daily or even monthly occurrence but I do range charge on occasion. That said I have not been able to see any changes (good or bad) when I have range charged.
Range charging does at least two things for the 3.0 battery. One is that it balances better with a full charge than with a standard (80%) charge.
The other is that the CAC algorithm gets better data, and will consistently increase the CAC estimate based on it. This is a much bigger effect. If you look at my car (670, the red line) in the charts I've published, you'll see several times where the CAC went up a bunch over a short period of time. Those were all doing several range charges in a row over several days.
I doubt it. Once a month should be fine unless you need the range.Based on this, do you suggest a RANGE charge normally? Isn’t it bad to have the car sit at a SOC of 100% for a long time, though? I don’t drive the car daily but nowadays I’ll be driving it 4-5 times per week for sure— should I just range charge all the time? Is that better for the battery balance and CAC? Thoughts?
Also — @bolosky I saw your PM — I’ll try to pull the logs off the car to email you sometime in the next night or two! Thanks...
Didn't @bolosky already do that, with some potentially negative consequences?I'm still waiting for someone with a declining 3.0 pack to run it all the way down to see what the actual range is. That would determine if this situation is software or actually a battery cell problem.
I did this and the car shut down after 345 miles. 10 miles short of home. The computer said I had 40 miles of range when in real-time had only 20Range charging is NEVER better for the battery. The CAC will change, but that is just a calculation and has absolutely noting to do with the range or performance of the car. The car will shut down when one of the brick voltages reaches the minimum value, regardless of what the CAC is. Unless you have some weak cells, you just need to keep it plugged in to keep it balanced. It will top off the charge and start balancing daily. I'm still waiting for someone with a declining 3.0 pack to run it all the way down to see what the actual range is. That would determine if this situation is software or actually a battery cell problem.
...345 miles. 10 miles short of home.
I did this and the car shut down after 345 miles. 10 miles short of home. The computer said I had 40 miles of range when in real-time had only 20
The 3.0 battery, or at least my 3.0 battery works much differently than my old battery. In range mode I get about 100 extra miles on the top end on charging. As soon as you are done charging you can change back to STD mode for full power. As Range mode also limits acceleration. But standard mode also limits the bottom 30 or so miles. When you get to 0 in standard mode I have had to switch into range mode. One frustration is that at about 25 miles it says battery is so low that range is undetermined. For some reason my car shut down early giving me 15 miles rather than the expected 30. Not sure if I have a problem or if the software still needed calibrated.@gregd - that is what confused me at first. I understand/understood the 3 charge modes (storage, standard, range) — but then did not understand how those integrated into driving modes. Since the HVAC is manual in the Roadster, and I’m a big fan of just “modulating my own right foot” — I could not see the point of the “Max Range” mode—
That said, now I get it. It sounds like it basically gives you access to 10% more of the battery. Which would obviously make sense on long trips if you need/want it. I’ve done a 1200+ mile and a 850+ mile trip in my 3.0 Battery Roadster, so I can tell you, every little drop counts when you’re traversing those distances. Having another 20-30 miles cab make/break travel in some parts of the country.
But... eking out the top/bottom of the battery clearly isn’t probaly Good for CAC/battery life. I think what I did today they makes more sense. My trip to PGH from Ohio was done in Standard charge mode, but getting home I did end up going into Max Range mode.
Question: clearly when you are in STD driving mode, and you think you only have 15% of battery life— you guys are saying you REALLY have 25% left. What happens when you run it down to < 5% of battery? Does it actually DRIVE for another 10% more “miles of range” after that? So in our case, a 3.0 pack that does ~300-330 miles, should actually be able to drive for 20-30 miles PAST 0% on the display, correct?
With the original battery, standard charging stops at about 83% of actual capacity, range charging at about 93%, and you can't go above that because it also turns off regen when it's that full. For the 3.0 battery, I expect those two numbers are going to be rather different. Battery cell balancing needs about 80% to start its work, so there was a discussion (as yet unresolved to my knowledge) what level standard charging gets you to on the 3.0 pack.Question: clearly when you are in STD driving mode, and you think you only have 15% of battery life— you guys are saying you REALLY have 25% left. What happens when you run it down to < 5% of battery? Does it actually DRIVE for another 10% more “miles of range” after that? So in our case, a 3.0 pack that does ~300-330 miles, should actually be able to drive for 20-30 miles PAST 0% on the display, correct?
@gregd... Question: clearly when you are in STD driving mode, and you think you only have 15% of battery life— you guys are saying you REALLY have 25% left. What happens when you run it down to < 5% of battery? Does it actually DRIVE for another 10% more “miles of range” after that? So in our case, a 3.0 pack that does ~300-330 miles, should actually be able to drive for 20-30 miles PAST 0% on the display, correct?