One of the main factors will be the size of your PV system. Let’s look at two different sized systems, and calculate how much you could potentially be able to sell back to the grid.
The average electricity usage in Ireland is 4,200 kWh. A solar system of around 20 square meters, or 3kW, can generate 10 to 15 kWh per day on a clear summer day. That would work out at around 4,000 kWh per year, and in theory, enough to power the average Irish home.
But of course, Ireland is not always sunny, and much less sunlight will reach your panels in the winter.
However, many homeowners have more space to work with, and therefore opt for a larger array of solar panels. A large PV system, say 6kWh, could generate over 5,000 kWh per year.
Say your household consumes 4,200 kWh of electricity per year (the average in Ireland), that would mean that you’d have 800 kWh to sell back to the grid, i.e. extra savings of about €170!