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  •  When I was working in PV, (0+ / 0-)

    Payoff times, (including subsidies,) were running about 12 years. That was in 2005, I'd have to re-run the numbers with current panel and power prices to give an updated figure.

    Also, the payoff time didn't vary much with system size. People who needed larger arrays paid more upfront, but they also had higher power bills, and it pretty much balanced out.

    We sized systems at 80% of the customer's average usage over the previous year. This was chosen because of California's odd net-metering law, which only allows residential customers to offset their actual charges (not including connection fees and the like)... any excess power you generate is a free gift to your utility, they don't have to pay you for it. With a system sized at 80% of average usage, our customers were paying an annual bill of between 60 and 100 bucks.

    Add in extras like battery backup and the calculus changes, but for your basic residential system, 12 years was the typical payoff time.

    --Shannon

    "It is better to die on your feet than to live on your knees." -- Emiliano Zapata Salazar
    "Dissent is patriotic. Blind obedience is treason." --me

    by Leftie Gunner on Thu Mar 17, 2011 at 04:23:10 PM PDT

    [ Parent ]

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