A 400-watt panel can generate roughly 1. 5 kWh of energy per day, depending on local sunlight. household's 900 kWh/month consumption, you typically need 12–18 panels.
For 1 kVA to 3 kVA online or line interactive models, expect 600 to 1,800 dollars for the unit, plus 100 to 600 dollars for batteries, and 50 to 500 dollars for installation.