BESS Augmentation Labor Time for Cycle-Life Degradation Calculator

What this calculator does

• Estimate the labor time required to install and recommission augmentation battery racks offsetting cycle-life degradation in a grid-scale BESS system, combining augmentation rack count, installation and commissioning rate, and a BMS recalibration overhead allowance.
• Use it when planning a capacity augmentation event for a degraded BESS fleet and you need to schedule the augmentation crew and estimate the system downtime window before the project owner is notified.

Formula used

• Base augmentation installation time = augmentation racks to install / rack installation and commissioning rate
• Required augmentation labor time = base installation time x BMS recalibration overhead allowance factor

Inputs explained

• Augmentation battery racks to install: Enter the number of new or refurbished racks to install to restore capacity lost to cycle-life degradation.
• Augmentation rack installation and commissioning rate: Use measured rack installation and BMS recommissioning throughput from previous augmentation events or the vendor O and M time study.
• BMS recalibration and SoC balancing overhead: Add overhead for BMS parameter reconfiguration, SoC re-balancing of augmented strings, functional test, and documentation sign-off.

How to use the result

Common questions

• How is augmentation capacity sized to offset BESS cycle-life degradation? Augmentation capacity is sized by calculating the MWh deficit between current state-of-health capacity and the contracted minimum capacity threshold, then dividing by the usable kWh per augmentation rack. Adding 5 to 10 percent margin ensures the augmented system stays above threshold for the remainder of the warranty period.