Solar panels are very efficient at taking advantage of solar radiation. In our latitudes the sun generates up to 1000 Watts per m². With photovoltaic panels we can capture 200 W / m², with thermal energy it rises to 800W / m², four times more! Solar panels are much more profitable than photovoltaic panels and much less expensive. The "home made" solution Eric Lafond offers us easily reaches 500W / m² for a cost of 15 € per m².
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