LiFePO4 cells with an integrated battery management system, usable to roughly 80-100% depth of discharge and rated for 3,000-6,000 cycles, versus roughly 50% DoD and 300-500 cycles for a comparable lead-acid bank, several times the usable capacity and lifespan from the same physical footprint. Trade-off: the sealed BMS electronics are the highest-performance component among this catalog's power-storage entries and also one of the least field-repairable, a BMS fault typically means a specialist callout or a full module swap, not a field fix.
Note: Cost, carbon and footprint are rated against the other options for this same need, not in absolute terms.
No sizing or quantities: how much a technique yields, and how much a household needs, both depend on the build and the people, so the catalogue compares options rather than dimensioning them. It carries no bill of materials and no build sequence, and it is written for an oceanic, clay-soil climate (Normandy, France). Regulatory notes are indicative and need confirming locally.