On average, a 30kW solar installation will produce between 100-140 kWh of electricity per day. But the actual solar output depends on several variables. A 30kW solar system with premium equipment can realistically generate around 120 kWh per day in a temperate climate with 5 peak sun. Most common solar panel sizes include 100-watt, 300-watt, and 400-watt solar panels, for example. How Much Sun Do You Get (Peak Sun Hours). Select appropriate components, including the solar panel, charge controller, battery, and inverter; 3. These panels are often used in various applications like powering small devices, lights, or charging batteries. The cost of a 30kW solar system starts at $19,399 in Adelaide and can go up to.