wiztecy
Active Member
Correct. I observe a short delay around 3 - 5 mins after the charge has completed before the balancing initializes.
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Correct. I observe a short delay around 3 - 5 mins after the charge has completed before the balancing initializes.
Then they ARE shutting off charging and letting the cells settle a bit before starting to balance. That gives them a more accurate measurement of voltage for each cell (or cell brick) before starting the balancing phase. That makes a lot of sense, and is much better than how most off the shelf balancers work.
There must be a certain tolerance or voltage difference that is defined as sufficiently 'equal'. Anybody know how much that is?
I'm wondering how long the balancing effort continues after charging ceases. When I check on it nothing seems to have been happening.
I'm wondering how long the balancing effort continues after charging ceases. When I check on it nothing seems to have been happening.
wiztecy
Active Member
djp
Model 3 Performance
The target voltage delta is 0.02V. The balancing cycle can take anywhere from a few minutes to over 24hrs depending on how far out of balance your pack is.
That's great, AudobonB! I hope 'dead' doesn't get added to that blotter.
Thanks, wiztecy, for the flow chart. I'll download the patent and understand their algorithm.
My concern with this new (refurbished) ESS is that, every morning, I look at the balancing matix and it's a sea of mostly 1's - mostly in the higher numbered bricks. Some sheet numbers are all 1's.
Maybe it's creeping slightly better. But did original owners with new batteries need to go through this?
Thanks, wiztecy, for the flow chart. I'll download the patent and understand their algorithm.
My concern with this new (refurbished) ESS is that, every morning, I look at the balancing matix and it's a sea of mostly 1's - mostly in the higher numbered bricks. Some sheet numbers are all 1's.
Maybe it's creeping slightly better. But did original owners with new batteries need to go through this?
When I built my first electric bike I plotted the charging cycle of each of the 16 cells in my pack. When I bought my RAV4EV with the Tesla drive train I went to sleep at night, secure in the knowledge that Tesla was doing that for me. Especially since that pack had thousand of cells. LOL
djp
Model 3 Performance
It could take a few months for a new pack to fully balance. The balancing happens faster after a Range charge, but at the risk of faster degradation. Let it sit for as long as possible after a Standard charge, eventually it'll get there.
wiztecy
Active Member
Keep an eye on the CAC, as it balances since its a refurbished pack you should hopefully see a correlated rise in CAC/ideal miles. As for how long will this go until its fully balanced, its variable depending how out of balance the pack is due to storage at a lower SOC. It can run its course for 3 weeks plus, just be patient and ensure you allow it to sit at 82%+ SOC each day which is around 174+ ideal miles and it'll take its course to normalize.
So you are in the 60's after a full standard charge? What are your min and max brick voltages after charging?
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