Unfortunately there is no average. There are many factors that determine how much your solar project will cost. From the brand, wattage and efficiency of the solar panels you choose, from the amount of panels you’ll require to power your home (as everyone uses different amounts of electricity even in similar homes due to family size, appliances, habitual use etc. ) and finally the simplicity or complexity of the install.
We have found that every home is uniquely different and requires a seasoned eye to customize and tailor the right work for your home personally.