Battery storage is important with solar PV systems in the UK for several reasons. Firstly, it allows surplus solar energy to be stored for later use during periods of low solar generation, optimising self-consumption and reducing grid reliance. This improves energy resilience, ensuring a consistent electricity supply even in adverse weather. Additionally, battery storage maximises the return on investment for solar PV installations, as it enables users to offset more of their electricity costs and potentially shorten the payback period. Moreover, it contributes to grid stabilisation by balancing supply and demand, supports the integration of renewable energy sources, and offers environmental benefits by reducing greenhouse gas emissions and reliance on fossil fuel-based power plants.