Between a Panel number, Tilt and the Total annual energy output of the panel (KWh or year) which one was a factor kept constant (which variables were controlled) during this experiment of solar panels
1 answer
Based on the given information, it is not explicitly mentioned which variable was kept constant during the experiment of solar panels. However, based on common experimental design practices, it is likely that the Panel number was controlled or kept constant during the experiment. This means that the other two variables, Tilt and Total annual energy output of the panel, were likely manipulated or varied to observe their effects on the solar panels' performance.