Ihre Angaben
Gerechnet wird mit Sonnenstunden — der Anzahl Stunden pro Tag, in denen ein Modul rechnerisch seine volle Nennleistung liefert. Die Werte gelten für flach liegende Module; wie viel eine Neigung bringt, hängt stark von der Jahreszeit ab.
Ergebnis
Angaben eintragen und auf „Berechnen“ klicken. Der Rechenweg wird mit ausgegeben.
The result is a planning value, not an acceptance test. The data sheets of the components used and the applicable standards are authoritative.
Solaranlage auslegen →What "sun hours" mean
The calculation is not based on daylight, but on sun hours: the number of hours per day during which a module would theoretically deliver its full rated power. A summer day on the Baltic Sea yields about 4.5 hours in this calculation, the same day in the Mediterranean over 6, and a winter day in Central Europe just under one.
Why it never reaches 100 percent
There are losses between the module and the battery: the controller, the temperature of the cells—warm modules produce less—, dirt, a non-optimal tilt angle, and the cables. The calculator accounts for this as system efficiency, with a higher value for MPPT controllers and a lower one for PWM controllers.
Shading has a disproportionate effect
Even a shadow over a single cell—from the mast, the railing, a branch—can significantly reduce the output of the entire string. Separate controllers per module or a different setup yield more here than additional watt-peak.
From yield to system design
The value is a daily average for the selected season. Individual days are significantly above or below this—for system design, it's not the good day that counts, but whether the battery bank can bridge the bad ones. Therefore, a comparison with the daily balance is useful: Does the yield cover consumption, or does each day deplete the reserve a bit?
Winter is a special case
In most locations, solar power in winter contributes little more than the quiescent current of the system. If you want to monitor during the lay-up period, plan for shore power or a correspondingly large battery bank—monitoring that itself drains the battery is worse than none.
Prefer to go through it together?
Send us your values — we check the design and usually reply on the same working day.
