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Old 09-09-2008, 12:39 AM   #11 (permalink)
Axaday
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Quote:
Originally Posted by rmay635703 View Post
I don't really understand this statement

Electric here is $0.11 per kwhr
$1 per watt means $1000 per kwhr capable panel 1000watt an hr =1kwhr
$1000/$.11 = 9090.90 hrs to payoff

9090.9090 / 8 hrs of light a day / 365 = 3.09 years to payoff

Obviously assuming there is no inverter, battery packs, ect.

What am I missing?
When you are buying solar panels, a 1 kw system does not generate 1 kwh/hour. It generates 1 kwh/day. At $1 per watt, 1 kw costs $1000 and generates 365.25 kwh/year. Electricity costs 9 cents here, so the $1000 system generates $32.87 worth per year. That's a 30.42 year payoff.

Where you live, it is a 9090.9 DAY payoff, not hour. So 24.89 years.

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