Self-consumption PV installations in the residential sector have a great potential to mitigate emissions associated with fossil fuels. However, few studies analyse the influence of the seasonality of the prosumer’s consumption habits on the evaluation of PV self-consumption. Thus, this work develops a detailed analysis of the evaluation of self-consumption and self-sufficiency as a function of different variables, such as the size of the installation, consumption habits, and existing installations in the home, among others. In addition, a sensitivity analysis is carried out, in which it is studied how a change in the hourly and monthly distribution of consumption influences self-consumption. The results show the importance of considering the prosumer’s consumption habits. Dwellings with electric heating have a greater potential to increase self-consumption than other dwellings, while in low-consumption dwellings the hourly or seasonal distribution of consumption does not play as important a role as in high-consumption dwellings. On the other hand, it is shown that the hourly distribution is much more significant than the monthly distribution since improvements in the hourly distribution of consumption can increase self-consumption and self-sufficiency by 21.05 % and 29.6 %, respectively.