30 May '16, 12pm

Solar Thermal Is Really, Really Dead - 2014 analysis shows how much cheaper it is to heat water with PV

Martin thanks for the surprising opinion on off grid economics of pv vs solar thermal. I should clarify that the 11.4 kWh system serves a 10,000 sq ft house which has a population of from 10 to 25 people. It is a retreat center. So the system is actually small for what it does. It is only because we are hyper efficient that the system is adequate. I believe all long time off grinders need to rethink the old formulas because of the drastic fall in pv prices. The old formulas of 85% pv 15% generator, was sensible. I now think close to 97% pv 3% generator is a better formula. As well 3 to 5 days battery storage can be reduced to half of that....the reason is Pv should be tripled and that gets you through a few cloudy days with the cheaper electricity of pv vs expensive battery kwh. In general it is being realized that overbuilding wind and pv is cheaper than storage up to a p...

Full article: http://www.greenbuildingadvisor.com/blogs/dept/musings/so...

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