Assuming an average of 4 hours of usable sunlight per day and a system capacity of 4000 watts (4 kilowatts), your solar panels would generate an estimated 1200 kilowatt hours (kWh) of electricity each month. In other words, 1 kWh per day. This is just an estimate based on averages,. Most solar panels on the market today are between 250 and 400 watts. A 4 kilowatt (KW ) system would require between 10 and 16 solar panels to produce that much power. The average home in the United States uses about 940 kilowatts of power per month, so a 4. Solar power is a hot topic these days. With the cost of electricity rising and the push for renewable energy, more and more people are looking into solar power for their homes. Solar. A 4KW solar system with batteries is a great way to save money on your energy bills. This system can provide enough power to run your home during the daytime, and then. Are you looking to go solar but worried about the cost? Well, we have good news for you! A 4KW solar system can be yours for just $900. That's right, for less than a thousand dollars you.