Solar is NEVER the prime path for a power solution if you can use other sources.
I come from the sailing boat community and even there, when you need to spend 26 days to cross the Atlantic, solar is only part of the equation, wind and diesel generator supplying the big part of power.
There is a reason why solar have not taken over and the reason is that even with all the modern technical advances, a little 2000w gas generator is still way less expensive to run than solar.
On a bigger picture, cheap energy is what you want to improve people's life and solar is still not the solution even in that bigger aspect .
20 years to pay off is not a solution.
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