Solar panel costing.xls
I have also been investigating purchasing a solar p.v. panels to free my house from the national grid. Using my electricity bill and using information on
I calculated that I could totally replace my electricity supply with 17 solar panel units each covering 8sqm. The cost is a whopping £102000 about ($204000). Ignoring interest that’s a 76 year payback period and the system only lasts 25 years.
Does any green initiative actually stack up on paper or is simply a costly gesture?
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14 Aug 2008
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Power (watts) = Head (m) x Flow (litres/sec) x 9.81 (gravitational constant ‘g’)
A typical efficiency of water to wire is around 70%, you should therefore multiply the result by 0.7 giving the actual amount of electricity that you could expect from your proposed hydro site. Looking at your power consumption in "Solar panel costing.xls" a 3KW turbine should be adequate. It costs about £1500 so it will pay back in just over a year. Background information.
I am interested in quinetic's comment on ground source heat pumps. Even though you need provide power to the heat pump I think there is something like a 3:1 return in the form of heat.