The average amount of electricity used by Irish households each year is 4,200 kWh, which will result in an annual bill from your electricity provider of over €2,000.
For one or two bedroom apartments, the average is around half of this amount, while it is roughly double for three or four bedroom detached homes.
With a 3 kW array of PV panels on your roof covering 15 metres, your system could generate 15 kWh on a clear summer’s day.
This means that with 365 days of sunshine, a 3kW system would generate 3,000 kWh per year.
But on average winter’s day, your system will generate much less – in the region of 3 kWh per day.