Ongoing maintenance costs should be zero or near zero. If anything breaks it will be the inventor but they can last over 20 years. 1 year profits should cover a new inventor. I have a 10 year warranty on the inventor, you can get 20 year but it didn't seem worth while to me.
Install costs with extras was £6100 would have been below £6000 if I didn't get the extra gadgets. The saving in electric alone should mean a £15 year breakeven point. The payments for energy produced should push the breakeven point down to around 6 years. Before buying I estimated 10 years break even but so far it’s working better then I hoped.
Yes I plan to stay here a long time. It’s a little early to say for sure but the numbers come out as 6 years perhaps a little less as I don’t work in the summer so gain more benefit. In theory return investment in 20 years will be around £21,757.
Above is assuming approximately 3356 kWh of electricity per year on average. Feed-in Tariff of 14.38p per kWh x 3356 kWh will generate an annual income of £482 per year for 20 years. The rest of the saving comes from the reduce energy bill. The reduce energy bill is the hard bit to work out for me. Worse case should be a 10 year payback. But so far it looks more like 5 to 6 year.
You have a 2nd device which counts up how much you produce and you get paid for that separate from the main meter. If the main meter counts backwards you cannot tell how much you used up.
