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109 cells. At 3.5 CV, this is 381.5 - or my observed Extended charge CV point. So CVs are matched. On the bottom, we have observed ~310V when the range gets to 10 miles. This would translate roughly to 2.8V per LFP cell. So the bottom matches, as well. But leaves very little room for balancing errors. So we are planning to add a couple of cells to total count of 111 - this way I sacrifice some capacity on top of the curve for LFP but get 2.9V bottom. Alternatively, we could just connect the BMS to a contactor that would break off the pack once the lowest cell hits 2.8V. The latter is probably the best solution overall. We will likely implement both at the same time.V
109 cells. At 3.5 CV, this is 381.5 - or my observed Extended charge CV point. So CVs are matched. On the bottom, we have observed ~310V when the range gets to 10 miles. This would translate roughly to 2.8V per LFP cell. So the bottom matches, as well. But leaves very little room for balancing errors. So we are planning to add a couple of cells to total count of 111 - this way I sacrifice some capacity on top of the curve for LFP but get 2.9V bottom. Alternatively, we could just connect the BMS to a contactor that would break off the pack once the lowest cell hits 2.8V. The latter is probably the best solution overall. We will likely implement both at the same time.
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