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When the Station Block Grows to 62 MWh, What Actually Shrinks Is Commissioning Labor, Not Cell Count
On September 16, 2026, BYD unveiled its second-generation grid-forming station block, the "GC Block," in a maximum 10 MW/62 MWh single configuration, stating that a 1 GWh project would require approximately 17 blocks. The same announcement claimed a 69.4% reduction in BMS management complexity, a maintenance workload reduction of over 60%, and an installation/commissioning workload reduction of over 18%. Working backward from these three figures using the same assumed unit-count reduction rate (91.5% under a baseline assumption), the unit-count-proportional share of on-site commissioning labor turns out to be only about 20%, with the remaining roughly 80% proportional to cell/energy count. In other words, block enlargement is a lever that attacks…
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Grid-Forming PCS Mandate Redesigns FAT Takt Time and the BMS-PCS-EMS Interface
As grid-forming (GFM) inverter performance requirements become mandatory starting with long-duration BESS (Battery Energy Storage System) in the centralized-contract market scheduled for commercial operation in December 2027, five new verification stages are added to PCS (Power Conversion System) manufacturers' Factory Acceptance Test (FAT) lines. In an assumed-scenario calculation, per-unit FAT time increases by approximately 142% over the existing baseline, pushing the takt-time share from the 10% range to the 24% range, and if retests recur, the Availability factor of OEE (Overall Equipment Effectiveness) is the first to be shaken. At the same time, a design challenge emerges: a layer separation is needed between the grid-forming control loop, which requires sub-cycle…
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