The 4Kw limit should be on the infeed and not the solar panel capacity.
You could put 10Kw worth of panels up just limit the output to 4Kw. Now you have a more stable 4Kw feed.
Yeah, my dad has that setup. Over provisioned panels so he still can get max output more of the year. Not to the amount you suggest, but his inverter can safely have about 20% more input than output.
He bought used panels so the actual input may be a little lower than rated (though it doesn’t seem much lower), but he says he sees some ads for new panels nearly as cheap as he paid for used ones 5 years ago.
He bought used panels so the actual input may be a little lower than rated (though it doesn’t seem much lower), but he says he sees some ads for new panels nearly as cheap as he paid for used ones 5 years ago.