Has anyone modelled how the finances will stack up on a 4kW system generating 3500 kWh p.a?
My rough notes suggest that a lot depends on in-house consumption. If, and it's a very big IF, the householder can use 50% of generation at 14p per kWh, then you're looking at:
Generation tariff (1.63p) = £57
Export tariff (4.85p on 50%) = £85
Bill savings = £245
Total = £387
On a £5000 install cost, this looks like an 11 year payback.
On a £4000 install cost, it's about 9 years.
Does this look right?
My rough notes suggest that a lot depends on in-house consumption. If, and it's a very big IF, the householder can use 50% of generation at 14p per kWh, then you're looking at:
Generation tariff (1.63p) = £57
Export tariff (4.85p on 50%) = £85
Bill savings = £245
Total = £387
On a £5000 install cost, this looks like an 11 year payback.
On a £4000 install cost, it's about 9 years.
Does this look right?