“Current” are the numbers from 2004, anticipated is probably realistic for what we have now. This calculation is not for private installations tho, because those get much less money for each kWh. With huge scale commercial installations 2-3 years is probably realistic. For private installations its still like 10 years for it to pay back its cost. Depends heavily on you local weather and electricity buy/sell prices ofcourse.
This site is slow af to load a measly pdf so im gonna add this screenshot. https://www.nrel.gov/docs/fy04osti/35489.pdf
“Current” are the numbers from 2004, anticipated is probably realistic for what we have now. This calculation is not for private installations tho, because those get much less money for each kWh. With huge scale commercial installations 2-3 years is probably realistic. For private installations its still like 10 years for it to pay back its cost. Depends heavily on you local weather and electricity buy/sell prices ofcourse.