As I am experiencing some weird behaviors lately, have started looking into what can cause them and what should be the expected performance from such pack.
At this point naming it 85kWh is anecdotal, but I’ll stick to the label.
Early cars are prone of failure due to water infiltration, very helpful thread started by @wk057
That should cover up to the introduction of 85D that seem to have the drain relocated.
The generic BMS errors are a clear indication of most failures, but what can we look after and detect before?
On my car (85D, 105k miles, 698xx VIN) I can see the following:
Power limits on hard acceleration present from 60% SOC (visible after few seconds of WOT)
This seems to be correlated with pack voltage dropping and amperage not keeping up. Probably the Performance packs can keep higher amperage and hide the issue better. Amperage drop with SOC is normal, but what should be the normal voltage sag on these packs?
My voltage sag is between 100 to 120V, minimum that I’ve seen is taking the pack to 249V at 40%. That is under load with cell voltage as low as 2.56V.
Can the high sag and voltage drop on cells be considered as valid metrics for the pack health seen that the BMS will shut down the car at 2.5V?
At this point naming it 85kWh is anecdotal, but I’ll stick to the label.
Early cars are prone of failure due to water infiltration, very helpful thread started by @wk057
That should cover up to the introduction of 85D that seem to have the drain relocated.
The generic BMS errors are a clear indication of most failures, but what can we look after and detect before?
On my car (85D, 105k miles, 698xx VIN) I can see the following:
Power limits on hard acceleration present from 60% SOC (visible after few seconds of WOT)
This seems to be correlated with pack voltage dropping and amperage not keeping up. Probably the Performance packs can keep higher amperage and hide the issue better. Amperage drop with SOC is normal, but what should be the normal voltage sag on these packs?
My voltage sag is between 100 to 120V, minimum that I’ve seen is taking the pack to 249V at 40%. That is under load with cell voltage as low as 2.56V.
Can the high sag and voltage drop on cells be considered as valid metrics for the pack health seen that the BMS will shut down the car at 2.5V?