How a grid lithium-ion battery works

Shipping-container-sized units of lithium iron phosphate cells, grouped into blocks with their own transformers. Charge on midday solar, discharge into the evening peak. Every number comes from one model.

Sources: Energy-Storage.news, “Under the hood: inside Tesla's Megapack 3 as Texas production begins” (2026: 5 MWh, 2.5 MW, up to 8 hours, 92.5% round trip, 38 t, 8.1 × 1.6 × 2.8 m, Megablock of four units for 20 MWh, up to 248 MWh per acre; preliminary, no full datasheet yet). The 40 MW / 160 MWh site, the day's schedule and cell temperatures are illustrative. Others on this approach: Fluence, CATL, BYD Energy Storage.