How to Measure Performance Gains from Bifacial Technology?

Understanding Bifacial Power Measurement

When measuring the performance of bifacial panels, it’s essential to account for the reflected light energy that contributes to the total power output. A common method is to use a power metering system that can capture the energy generated by both the front and rear sides of the panel. This requires a data logger capable of recording energy production at regular intervals, ideally every 10-15 minutes, to capture the daily and seasonal variations in energy output.

Comparing Bifacial to Monofacial Performance

To accurately compare the performance of bifacial panels to monofacial panels, it’s crucial to conduct a baseline test under identical conditions. This can be achieved by installing both types of panels on the same tracker or roof, ensuring that shading, temperature, and other environmental factors are evenly distributed between the two. By comparing the energy production of the bifacial panel to the monofacial panel over a minimum period of 30 days, you can establish a reliable reference point for comparison.

Calculating Energy Yield Differences

Once you have collected data on the energy production of both panels, you can calculate the energy yield difference by subtracting the monofacial panel’s energy output from the bifacial panel’s energy output. To express this difference as a percentage, divide the energy yield difference by the monofacial panel’s energy output and multiply by 100. For example, if the bifacial panel produces 10% more energy than the monofacial panel over a 30-day period, you can attribute this gain to the bifacial technology.