Almot wrote:
What BFL said. Temperature effect is useful to estimate the expected output. Different panels have a different power loss coefficient, see the 3rd table . Those numbers 0.3-0.5 are % of power loss per 1C degree.
At 45C it's not terribly bad, around 12% loss for the most temperature-sensitive panel.
It does not look too bad when considering a single panel,but look at multiple panels, which is the case in most applications. 4-100 watt panels each loosing 12% of their output at 45C equals a total loss of 48 watts.
That would also have to assume that the panels stayed at 45C durring the entire available charging time, which would only happen in a controlled environment
My point is that unless one wants to spend time taking temperatures, adjusting panel angles, doing calculations, and making constant adjustments all day every day, the manufacturers specifications are sufficient for the expected output.
