Quote:
Originally Posted by Snax
Yep. On the best day, my 4.96kW array has only produced 3.8kW here in Eugene. This time of year, even half that peak production does not happen, and when it does, it is fewer hours. (Highest recorded totals this year were 28kWh in June, and 5.3kWh in December, or about $2.80 vs. $0.50 saved on those days.) It produced 4.9MWh for the year, saving just over $490. At that rate, it is going to take 12 years to pay for itself - plus my extra effort to keep them clean.
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My 6.4 kW array produced 5 MWh last year, but I started in May. July was my peak, at almost 1 MWh. 220 kWh Nov, and 210 kWh Dec. My estimate was 1 MWh per year, per installed kW.
It will take 12 years to pay for itself, not adjusting for rate changes or opportunity cost of not investing the money into the stock market, which would have been phenomenal in March.
I'm glad I did it for the experience, and it will probably end up at least breaking even financially all things considered. Probably a nightmare when I go to re-roof, but that's future self's problem.