2 ms·
Yes — good question. In this study “voltage spread” does not mean per‑battery terminal differences. I did *not* disconnect the packs or probe each unit individu
by wkcollis1 10mo ago
Yes — good question. In this study “voltage spread” does not mean per‑battery terminal differences. I did *not* disconnect the packs or probe each unit individually.
Because the cells are hard‑paralleled, their terminals are forced to the same potential, so true inter‑battery divergence can’t be measured without isolation taps. Instead, “spread” refers to:
*Voltage_Max – Voltage_Min of the pack‑level voltage within each hourly window.*
This captures short‑term variation in the measured pack voltage (ADC noise, EMI artifacts, inverter mode shifts, temperature coefficient), not cell‑to‑cell imbalance.
The raw data is in `Data/combined_output.csv` with columns:
```
Timestamp, Voltage_Min, Voltage_Max
```
Those come from 60‑second samples aggregated hourly. The analysis scripts compute:
```
Spread = Voltage_Max – Voltage_Min
```
So the ~10–15 mV “spread” in the report reflects the measurement envelope of the pack, not divergence between individual batteries. Measuring true per‑battery drift would require either per‑cell taps or momentary isolation, which wasn’t part of this study.
Happy to go deeper if you want details on sampling or noise characterization.