My Aurora 3600 typically runs with an internal temperature around 40-50'C. Its internal cooling fan switches on as needed - sometimes on for hours on end, sometimes on-off-on-off for ten minutes at a time, sometimes not on all day; it also varies its cooling fan speed to achieve the required cooling effect and keep the inverter within acceptable temperature ranges.
At this time of year, even on the best bright sunny days my system only reaches a peak of 50-60% of its maximum capacity for only about an hour a day, due to the sun being low in the sky and weak.
Most of the time at the moment my system is operating at very low output. Some days recently with heavy cloud I only managed about 0.05-0.1kW per hour for about six or seven hours, with a day's total generation of less than 0.5kWh.
In the middle of summer (around June-July) my panels also only achieve about 70-80% of their maximum capacity due to the panels themselves overheating in the hot sun.
In most cases, a solar PV array will only reach peak output on a regular basis in spring and early autumn (e.g. April, May, September). At other times the sun is too weak or the air temperature around the panels is too hot.
Peak power can be seen in summer if there is partial cloud cover which blocks the sun for a few minutes and allows the panels to cool, so that when the sun comes out again, the panels can perform at their peak for a few minutes before getting too hot again.
