energy payback time
The time required for any energy producing system or device to produce as much energy as was required in its manufacture. For solar electric panels, this is about 16-20 months.
Kuidas saab elektrit tasuta ? https://elektritsaabtasuta.blogspot.com/2016/11/kuidas-saab-elektrit-tasuta.html Isegi lapsed meisterdavad endile elektrituulikuid ja päikesepaneele sest peale tasuvusaega annavad nood elektrit ja kütet tasuta jpms: http://elektritsaabtasuta.blogspot.ie/2012/06/polve-peal-meisterdatud-elektrituulikud.html
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