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Current control oscillation #34
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I can't quite see what your float voltage is in your screenshot above, can you confirm please? |
So at the time of the current oscillation, your float voltage was 56.1v, or 3.506v per cell? |
Yeah, I needed to raise it because otherwise it will never balance out ... And until now bulk -> float transitioned immediately. I'll try to go to the garage and implement the new changes now ... |
Now it's around 3.55 VDC for the cells that are on the high end. Still 3.39 VDC for the 2 remainining ones ... |
With the following settings:
You end up with a curve like this: Those settings result in a request to reduce current 180A over 14mV. That's not realistic, even if it were linear then it'd be nearly 13A per mV. You should set float back to 3.37v or so, expanding the range over which the current will be reduced. |
But if I recalled correctly, previously (yesterday ?), this was also happening during Bulk, not only Float ... |
The code for this feature uses the cell float voltage as the start point of current tapering. |
I agree. Problem is that even though I properly balanced it 3 weeks ago, it unbalanced quite quickly since then (and I don't think I went above the required knee point of the charge characteristic, when there was no communication between Inverter and BMS). |
For now, I'll close this issue out as the code itself is not causing the problem. |
OVPR is set at 3.52 VDC:
Detail of max cell voltage
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