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Posted on Monday, January 29, 2007 in Uncategorized

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How much would it cost to build a solar energy unit for our business 40,000 kwh p/ month?

A lot depends on where the business is located. But let me assume that this is in my area of California, where the average peak sun is 5 hours / day.

5 x 360 = 1800 hours / year.

Your energy requirement is

40,000 x 12 = 480,000 kWh / year

480,000 / 1800 = 260 kW array

That’s a good size project, so bids may be agressive. With the federal rebate, you might be a $4 / watt price in the near future, making the price tag about $1 million net.

Knock off the final digit to approximate the square feet required for the array – 26,000 square feet, a little more than half an acre. If it won’t fit on the roof, maybe it would fit on a parking structure.

This exceeds the size of any commercial array I’m aware of, except those of Google, Cypress, and Hewlett-Packard.


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