Energy Generation Capacity: An 8kW solar system produces about 32 kWh on sunny days, suitable for average daily household consumption of 20-30 kWh. What is this? Battery Storage Needs: Typically, 2-3 lithium-ion batteries (10 kWh each) are recommended for full backup, depending on daily energy. . An 8kW solar system refers to a solar energy system that has the capacity to generate 8 kilowatts (kW) of electricity under optimal conditions. This involves a set of solar panels, an inverter, and other components that work together to convert sunlight into usable electricity. Check your power bills to find the actual kWh consumption for your home or business.