This calculator lets you estimate how many LG solar panels are likely to fit on your chosen roof. It allows the selection of multiple roof areas on your building, so you can increase the system size. You can select North, North West and North East facing roofs. Do not choose Southern facing roofs as they will produce very poor solar output. Please follow the step by step instructions. The calculations provided by the calculator serves as a guide only, you should seek advice from your solar installer.