How Many Batteries to Power A Household?

For example, in Western Europe: an ordinary household uses 9.5 kWh, 30% of which is used during the day and 70% is ed at night, then uses about 3.5 Kwh during the day and about 6 kWh at night. Therefore, simple mathematical calculations show that on average, need about 7.5 kWh of solar cell storage to offset all their night-time use. Therefore, when buying a EAZU-Powerwall, choosing a battery of 5-10Kwh is completely enough for their household appliances to be powered on overnight.
EAZY-PowerWall can Eazely upgrade modular to max of 72kWh when it is needed.