Quick answer: kW (kilowatts) measures power: how fast electricity is being produced or used at a moment in time. kWh (kilowatt-hours) measures energy: how much has been produced or used over time. Your solar system is named by its kW size, your electricity bill and your battery are measured in kWh, and a 1kW appliance running for one hour uses 1kWh. Solar quotes are full of numbers, and kW and kWh sit side by side. They look almost identical and measure different things. Once
