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posted by Blackmoore on Thursday December 04 2014, @10:30PM   Printer-friendly
from the just-short-of-obvious dept.

In the US, a new solar project is installed every 3.2 minutes and the number of cumulative installations now stands at more than 500,000. For years, homeowners who bought solar panels were advised to mount them on the roof facing south to capture the most solar energy over the course of the day. Now Matthew L. Wald writes in the NYT that panels should be pointed south so that peak power comes in the afternoon when the electricity is more valuable. In late afternoon, homeowners are more likely to watch TV, turn on the lights or run the dishwasher. Electricity prices are also higher at that period of peak demand. “The predominance of south-facing panels may reflect a severe misalignment in energy supply and demand,” say the authors of the study, Barry Fischer and Ben Harack. Pointing panels to the west means that in the hour beginning at 5 p.m., they produce 55 percent of their peak output. But point them to the south to maximize total output, and when the electric grid needs it most, they are producing only 15 percent of peak.

While some solar panel owners are paid time-of-use rates and are compensated by the utility in proportion to prices on the wholesale electric grid, many panel owners cannot take advantage of the higher value of electricity at peak hours because they are paid a flat rate, so the payment system creates an incentive for the homeowner to do the wrong thing. The California Energy Commission recently announced a bonus of up to $500 for new installations that point west. "We are hoping to squeeze more energy out of the afternoon daylight hours when electricity demand is highest," says David Hochschild, lead commissioner for the agency’s renewable energy division, which will be administering the program. "By encouraging west-facing solar systems, we can better match our renewable supply with energy demand."

 
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  • (Score: 0) by Anonymous Coward on Thursday December 04 2014, @10:41PM

    by Anonymous Coward on Thursday December 04 2014, @10:41PM (#122748)

    can you feel it

  • (Score: 0) by Anonymous Coward on Thursday December 04 2014, @11:32PM

    by Anonymous Coward on Thursday December 04 2014, @11:32PM (#122775)

    Wald writes in the NYT that panels should be pointed WWEEESSSTTTT so that peak power comes in the afternoon when the electricity is more valuable.

    WEST NOT SOUTH WEST NOT SOUTH
    WEST NOT SOUTH WEST NOT SOUTH
    WEST NOT SOUTH WEST NOT SOUTH

    https://www.youtube.com/watch?v=xW1fXL3s7bk [youtube.com]