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When did you start to see battery degradation
- Thread starter Leeroy
- Start date
Originally yes, but some have been "unlocked" to go to 100%.
Mudgee definitely is unlocked for 100%.
Over time, I have also charged over 95% at Berry [Apr-2021], Jugiong [Jun-2021], Port Macquarie [Nov-2021]
Edit: I pretty sure you know this, but you do need to press the 100% button on the charging unit.
It's pretty clear that the "estimated range at 100%" can't be taken directly as degradation, because as you noted it jumps up as well as down, and batteries don't un-degrade. A 100% charge is when a cell balance happens, which is probably what let your BMS get a better read on the true battery status.
It's the peaks you want to look at I think.
Actually mine now has supposedly has 69.3kwh when full and started off with 77.8kwh, so that would be a 10.9% loss according to Scan my Tesla which matches closely with Teslafi which reports it at 10.3%.
I live down in the coast in Victoria where is no hot by any means. Average temp while driving my car has been 16.8 C and 72.2kmh. I don't see heat or environmental conditions as a culprit for me. Hopefully things will stabilise from now on and the capacity stays where it is.
Considering may people with the older batteries (like mine) will never charge to 100% or only do so one or twice in the car's life, the car's range estimate must necessarily be pretty approximate. Either that or they rebalance more often somehow.
But looking at the energy meter and back-calculating from the Wh/km over 50km vs. how many km you have actually done, you might be able to get an idea of how the batteries are travelling.
Candleflame
Active Member
the estimate is very accurate. this makes sense because the BMS is not gonna let you take more energy than it thinks the battery can hold.
Slartibartfast is back from Melbourne! Two stops on the way home, one in Wodonga and one in Gundagai. The battery has been fully exercised from full to almost empty, she made it home with 9km range remaining, the lowest it’s ever been taken:
So if there was any battery cell balancing to be done, I reckon it has been done in this trip and the BMS will be recalibrated after months of lockdown non-driving and battery sitting at 50%.
Candleflame
Active Member
Could be. I read somewhere in the master threads that you need to leave the m3 battery disconnected from charge for something like 3 to 6 hours for the cells to be able to be balanced. Something to do with the cell technology used. Driving then placing it straight back on charge prevents the process.
Now that Slartibartfast has had a few decent leg-stretches over the last couple of months and Christmas/NY, and a number of fast and slow charging sessions, the car now shows 488 km fully charged. It was as low as 465 km a few months ago after spending lockdown in the garage doing not very much.
Very noice for a 2 year old car.
Very noice for a 2 year old car.
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