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I’ve had a 4kw system since 2011 and on a 100% south facing roof and it’s excellent. I generate way more than I would have imported without a system. However on a 50/50 south north I wouldn’t have bothered.
But be wary of what installers say you’ll generate and save ££ when I was looking into adding a battery two years back two quoted I would save £2k per year having a battery. Before the quote I told them my total import was less than £500 per year so how the feck I could save £2k god only knows It also worked out that still having to import the majority in winter and winter being a crap generation period it would take twenty years before the battery paid for itself
So take little notice if what an installer says and spend a lot of time recording your current usage throughout a year.