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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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