We have installed 16 photovoltaic panels (7.2 kWp) on two facades of our offices in Vigo, to cover a large part of the annual energy consumption. There will be times that the energy generated will cover everything we consume, with average yearly energy savings between 60% and 70%.
The useful life of the installation is estimated at 25 years with performance above 85%. Normally, under good maintenance, they can have an even longer life.
RoI of 6 years. It is a digitally monitored installation, so we will know the exact figure of the energy savings at the end of the first year, also if the initial simulations about energy generation and RoI were correct