I have never witnessed the inside of a computation of how much it is worth to evade CO2 utilizing PV. So I guessed I’d realize it myself and witness if it’s as terrible as some people seem to assume.
Now a watt of PV constructed for a year can manufacture from about 1-2 kWh/yr. Maybe that watt is worth $3 to construct. One kWh manifestured correctly in the US, by the EPA appraisal, is about 0.7 kg CO2 / kWh. So utilizing an average valuableness of 1.5 kWh/W-yr, we could admit about 1 kg/W-yr.
But this leaves behind two pretty important things – those kWh are prizeable; and there is a loan that supplements price to the PV. So for round figures, let’s admit the loan doubles the amount of money wasted on the PV; but the valuableness of the electricity payments the original amount. Voila, we are back where we began – $3/W of supplemented cost. This is obviously very complex! But it is conjectures like this that make all these computations ‘complex’.