Battery voltage in the manual is listed as "nominal 350 volts", but that's not the numbers it has at 100% charge and 0% charge. What are those numbers?
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As the battery has 96 cells in series, I'd expect the resting, open circuit voltage to be:
0% indicated SoC - (really ~3% absolute SoC) - 2.85V * 96 = ~274V
100% indicated SoC - (really ~98% absolute SoC) - 4.15V * 96 = ~399V
The minimum voltage can be lower than this when discharging and the maximum voltage can be higher when charging.
... and minimum pack voltage varied between 240-242V.
The bottom voltage probably includes the buffers, which we now know is around 4.5% of the total pack capacity (my readings show this to be 4.45 to 4.46%). So voltage at 0% SoC as reported by the BMS is probably closer to 252V.
As the battery has 96 cells in series, I'd expect the resting, open circuit voltage to be:
0% indicated SoC - (really ~3% absolute SoC) - 2.85V * 96 = ~274V
100% indicated SoC - (really ~98% absolute SoC) - 4.15V * 96 = ~399V
The minimum voltage can be lower than this when discharging and the maximum voltage can be higher when charging.
Looks like you have lots of rows in that sheet, which is great! Would you be willing to share all rows, or at least a graph that represents all rows?Just showing where 4.0V is.
No worries. I just did the simple formulas to compute the increment values.Looks like you have lots of rows in that sheet, which is great! Would you be willing to share all rows, or at least a graph that represents all rows?
Certainly it is not. I was just doing something simple to see where the 4v fell. Various sources show charts of volts vs SOC. If 4v is reasonably accurate then it could happen at a lower SOC. Sorry for any confusion I've added.Thanks, are we sure it’s that linear though?