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U.S. Department of Energy Energy Efficiency and Renewable Energy

Ask an Expert about Performance of Solar Technologies

Q.
If I adjusted the tilt to maintain a 90 degree angle to the sun, what would be the annual % solar gain?
Posted May 10, 2013 | Read Answer
Q.
What are the environmental benefits of using solar power as a main energy source?
Posted February 28, 2013 | Read Answer
Q.
What is the maximum output we could expect from our solar install?
Posted February 14, 2013 | Read Answer
Q.

Are solar generators a viable alternative to propane and gasoline generators? After hurricane Sandy I'm seriously considering investing in a generator, but I have concerns about safety. I'd be looking to power my well pump, my oil burner and a refrigerator. -Laura

Posted November 05, 2012 | Read Answer
Q.

What fundamental roof information should I get from my municipal facility managers in preparation for a solar PPA? -Todd

Posted November 05, 2012 | Read Answer
Q.
Is solar lights a viable option in my small town?
Posted October 05, 2012 | Read Answer
Q.

What is the levelized cost of the Ivanpah project? - John

Posted September 04, 2012 | Read Answer
Q.

With all of the surface area of wind turbines for the base, turbine, and blades, why is it not considered to cover them with PV installations? - Glen

Posted August 27, 2012 | Read Answer
Q.

Our community just added a dozen 240 watt panels to our courthouse annex.  I was planning on 240 watt max from the panels, but the inverters are of a lower wattage, 200.  Is this common across all applications?  

Posted July 30, 2012 | Read Answer
Q.

What kind of wind speed can solar panels withstand on roof installs?

Posted July 30, 2012 | Read Answer

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