As you qill already know, solar panels absorb solar radiation to transform it into consumable energy. They do this through so-called cells. These are small cells that usually contain silicon to promote the creation of an electric field in the solar module. For a domestic installation for the use of solar panels, it is necessary to. These are the most optimal conditions for the installation of domestic solar panels: 1. Orientation towards the south: this is the best possible situation to get maximun sunlight. Even if this isn't. To determine the degree of profitability, you must take into account the amortisation period. You have to calculate the final cost and benefits per year, taking into account the gross cost of the installation and the tax. Finally, have a look at these simple tips to help you get your hands on affordable solar panels: 1. Don't settle for the first option. Go to several. Up until now, the costs of a photovoltaic system at home have been specified. But let's talk about the prices of the panels in question, which are calculated in terms of cost per watt, usually.