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One could take my example to more worst case scenario, pushing the payback period out to 15 years at a calculated 4.8% ROI, and basically be net zero on the cost of putting the system on the roof over that same period, then enjoy the increased home value and remaining service life of the system for at least another 10-20 years or even longer tax free.
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2015 BMW i3 REx
2011 Ford Flex SEL AWD
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