Solar Production Calculator

Result

Peak sun hours are not daylight hours. They are the day's total solar energy expressed as hours at 1,000 W per square metre, so a long overcast day can be worth fewer peak sun hours than a short bright one. Use a figure for your own location and month rather than a national average. System derate covers inverter losses, wiring, heat, soiling and panel mismatch. Around 0.80 is the figure most design tools use; a hot climate, a dusty site or a shaded roof pushes it lower. It is why a system never produces the sum of its panel ratings. Production is seasonal: a system in a northern climate can make three or four times as much in June as in December, so an annual average says nothing about any particular month.