> your generation is lower in the winter months, you'll drain your battery each day, and the overabundance in the summer months doesn't help you. Certainly in

> your generation is lower in the winter months, you'll drain your battery each day, and the overabundance in the summer months doesn't help you. Certainly in the UK, you sell your over-generation back to the grid. This will offset the cost of buying from the grid on the days when your generation is lower than consumption. Certainly in the UK you may never get 100% net zero cost (not enough winter sunshine hours I suspect), but will help since most homes in the UK are heated via gas (as in gas, not petroleum)