We have to know the cost of power in every country . Also we have to know the installed power and the power of sun at the exact spot. It is totally different if we install a stand alone system in UK than a stand alone system in Greece.By the way very interesting article .
RE: Californian, Hawaiian homeowners charging ahead on residential batteries | Ars Technica
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Californian, Hawaiian homeowners charging ahead on residential batteries | Ars Technica