3kW solar system will produce about 12kWh of electricity or power per day, 360kWh per month, or 4,380kWh per year. Considering 5 hours of average peak sunlight per day. Now let's discuss how many hours of peak sunlight your location receives and how to. you have a 3kw solar system so it should produce 3kWh in 1 peak sun hour? well, not exactly. Yes, sometimes you'll receive 3kW of power output from your solar system but it will last for a few minutes. Some days you may get more power output and some. Here are simple steps to calculate the power output from your solar system. i would take a 3kW solar system and my city as an example (Florida city). Which receives on average 5.8 hours of peak sunlight per day. Now multiply the value by 0.8 to subtract the. Only under standard conditions, solar panels will produce their rated wattage output. which includes, 1kW/meter2 of sunlight intensity, 25oC temperature, no wind, and direct tilt angle. That is why we consider peak sun hours as the baseline when estimating the. All the numbers which i have talked about above are DC output (Direct current). Solar panels produce power in DC and also batteries store.