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Old 03-10-2014, 06:40 PM   #4 (permalink)
redpoint5
Human Environmentalist
 
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Join Date: Aug 2010
Location: Oregon
Posts: 12,396

Acura TSX - '06 Acura TSX
90 day: 24.19 mpg (US)

Lafawnda - '01 Honda CBR600 F4i
90 day: 47.32 mpg (US)

Big Yeller - '98 Dodge Ram 2500 base
90 day: 21.82 mpg (US)

Prius Plug-in - '12 Toyota Prius Plug-in
90 day: 57.64 mpg (US)

Mazda CX-5 - '17 Mazda CX-5 Touring
90 day: 26.68 mpg (US)

Chevy ZR-2 - '03 Chevrolet S10 ZR2
90 day: 17.14 mpg (US)
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The fuel savings will never offset the cost of the PV, and never give a measurable increase in fuel economy. There are many problems with this:

1. Cost of PV
2. Engineering the PV to the contour of the roof
3. Reduced aero efficiency due to solar modules on roof
4. Increased weight
5. How much solar radiation do you even get in Denmark?

I bet there would be a greater fuel savings by replacing the heavy and inefficient lead acid battery (50% charge-discharge efficiency) with a lightweight LiFePo4 battery (90% charge-discharge efficiency).
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