A 6 kWp system with a battery on a house in Hereford.
Using 6,500 kWh a year at 27p per kWh, the family saves £1,600 a year. After the grant the system costs £9,100, so the first years go on paying it off.
−£9,100break-even in year 6+£14,900
“After fifteen years, the family is £14,900 ahead.”
