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Do more quotes. Thanks expensive. I done 10 oversize panels and 5kwh battery for 9k 3 years ago. Prices went down since then
Edit: your golden rule will be do as many panels as physically possibly (go with company who offers most panels) and everything adjusted to that. Size of battery make sure it is at least your average daily consumption over at winter. So I would imagine 10-15 kWh for your usage