How big a solar battery do I need to store all my home's electricity?

A homeowner producing 3,800kWh annually from solar panels calculates needing about 1,068kWh of storage for complete energy self-sufficiency. This accounts for storing summer excess for winter use. While currently impractical and expensive (£100,000-£500,000), falling battery prices could make this feasible in the future, potentially reducing costs to around £8,000. This suggests a future where homes, even in cloudy climates like the UK, could become entirely solar self-sufficient and independent from the grid.