You can have up to 2000W panels with an inverter up to 800W. Note that the 800W is what you're allowed to produce, not feed in, but it can still be beneficial to overprovision panels because with 800W of panels you won't produce 800W of power in mornings, evenings and winter. Panels are also cheap af in Germany currently, about 60€ for a 440w panel.
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