In the real world, on average, a 50-watt solar panel will produce about 200 watts of DC power output or 16 amps @ 12 volts per day. Considering 5 hours of peak sunlight. Standard test conditions include 1000 watts per meter square (1kwh/m 2) of sunlight intensity, no wind, & 25 o C temperature. But. How much electricity can a 50w solar charging panel generate? 1. A 50W solar charging panel can generate approximately 250 to 400 watt-hours of electricity per day, depending on the solar panel's efficiency and the amount of sunlight it receives. Typical total efficiency ranges 75–90%. For 10kW per day, you would need about a 3kW solar system. If we know both the solar panel size and peak sun hours at our location, we can calculate how many kilowatts does a solar panel produce per day using this equation: Daily kWh. Solar panel output is the amount of electricity a panel generates under specific conditions, typically measured in watts (W) or kilowatt-hours (kWh) over time. The output depends on: Use our interactive calculator below Here's the basic formula to calculate solar panel output per day: Where:. The Solar Panel Output Calculator is a highly useful tool so you can understand the total output, production, or power generation from your solar panels per day, month, or year.