A: Battery storage’ lets you store the surplus solar electricity, instead of exporting it to the grid. Battery storage lets you use more of your solar PV system’s output (‘increases ‘self-consumption’). This reduces the amount of grid electricity you need to buy, saving you money on your electricity bill. Battery storage also allows you to store cheap energy tariff rates from the grid to use when the tariffs are much higher. Our Lux systems are ready to use with all Octopus Energy tariffs and any other energy provider that provides cheap night time energy tariffs.