In this blog, we'll break down the real-world performance of a 3kW solar panel, including daily, monthly, and annual power generation, and what factors influence it. 1 What Is a 3kW Solar Panel System? 2. 1 How Much Power Does It Produce Daily? 5 How Many Appliances. Wondering if a 3-kilowatt (kW) solar system is large enough to power your home or too large for your do-it-yourself (DIY) project? Below, we'll outline everything you need to know about 3-kW solar systems, including what they can power, how much they cost and how to determine if they're the right. A 3kW solar system is a popular choice for many homeowners looking to harness solar energy. It is typically installed on the rooftop and requires around $7200 - $10,800. A 3kW solar panel system can power the average three-bedroom household, on a typical day. This amount of electricity can power a washing machine, tumble dryer, electric.