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decrease in return for less frequent rebalancing or servicing. We see this is the case for Figure II- 5b: as the electrolyte decay rate increases, the optimal LCOS increases and the optimal lower capacity limit decreases. Interestingly, we see almost no change in the optimal LCOS as the overall fade rate increases (with the electrolyte decay rate held constant). This observation is a result of the near negligible cost of rebalancing as compared to the cost of servicing. Increasing the overall fade rate while holding the electrolyte decay rate constant is effectively increasing the crossover rate, which results in more rebalancing events. This appears to have no effect on LCOS, indicating the cost of rebalancing is minor, at least in the context of this model. This coarse finding suggests that improvements in membrane selectivity may not lead to long-term performance and cost benefits (though it impacts upfront costs, as explained earlier). While more detailed treatments of membrane performance within the environment of an operating cell as well as the effects of application-specific cycling need to be contemplated, this initial analysis suggests that reducing membrane cost rather than improving selectivity will have a greater effect on VRFB LCOS. 31PDF Image | Bringing Redox Flow Batteries to the Grid
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