Most solar PV and battery systems will have software that allow you to prioritise the best usage for your home.  If you are generating energy from your PV array, but not using it, then you will want to either sell back to the grid, or store in your battery for use later.  How much you use, when you use it and what your generation and consumption are likely to be, all play a factor in how you decide to operate your new system.  Optimisation software can help - ask your installer for more information