How on Earth you would need 20+kWh of batteries for a system that even run 24/7 uses 2.4 kWh? And absolutely doesn’t make sense to run it 24/7, even when no one

How on Earth you would need 20+kWh of batteries for a system that even run 24/7 uses 2.4 kWh? And absolutely doesn’t make sense to run it 24/7, even when no one is using it, if you are running it off grid.