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the solar pv in summer will be used, for sure, because batteries will forward the production until later in the day. Meanwhile wind production complements this by being stronger in the winter. A lot of storage is needed princippally because wind output varies from year to year. All this is discussed in a report published by 100percentrenewableuk, see discussion and links at https://100percentrenewableuk.org/

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It is almost meaningless to use total energy requirements as the yardstick. Solar is many times more efficient in summer than winter for obvious reasons and demand is much higher in winter. So unless you have months of storage you would need far greater quantities.

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