If there is only one solar panel with 410Wp or 440Wp (whichever is correct), how can the rated power be 900W? How much does the system supply to the domestic grid?
you've paid very close attention, that's a spelling mistake - it's not 900 watts but 600 watts but this only refers to the inverter Solar panels with 410 or 440 watts can only provide the power under perfect conditions however, the inverter is equipped with WLAN and this also requires electricity therefore you can not specify the power exactly but can be about 350 watts but if you then mount 2 solar panels, it is regulated at 600 watts this gives away electricity so you should work with 2 solar panels work with storage when the 600 watts are reached, what is more is stored and can then be fed in later