Books * Enter converter load power Watts * Enter number of powered hours per day 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Hours * Enter converter efficiency % * Enter your cost of electricity per kWHr £/$/Euros Cost of powering load converter per year £/$/Euros Carbon dioxide emission of converter per year at 0.523kg/kWHr kg * Enter new converter efficiency % * Enter purchase cost of new converter £/$/Euros Cost savings per year of new converter £/$/Euros Payback time for new converter weeks Carbon dioxide saved per year kg