This is simply a question of how many batteries you have. If the array is too small, it will charge up very quickly and stay full – meaning lots of energy is getting exported back to the grid. If the array is too large however, you would be paying thousands for storage that never actually gets filled, so it is a waste financially. All of our batteries systems are scaleable and additional batteries are easy to retro-fit, so we would recommend installing 5-6kWh initially, and monitoring your battery usage for a few seasons.