What percentage drop in solar conversion will PV panels have after the change? If I have 40x400 watt monocrystalline panels rated at 22% efficiency what will m

What percentage drop in solar conversion will PV panels have after the change? If I have 40x400 watt monocrystalline panels rated at 22% efficiency what will my power reduction be, approximately? Or in other words, how many panels will I need to add to maintain 16kw? Not delivered yet queued up with a vendor, may change order