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You can't compare it to a risk free investment.
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Sure you can, if cash is your funding source, which is cash and the cash return. . .
Because there is no income from solar investment, there is only cost savings. . . very different type of return analysis. .
the question is if the cost savings is high enough from the cash investment to add it to your long term portfolio which is 6-7% of income. I would not expect you to sell income producing assets of 5-7% to fund a cost savings of 0.5 %, does not make sense.
But you are correct in that solar panels are a long term investments, and therefore should reflect some sort of long term cost savings or income, since it doesn't over the small roof area, generate enough to produce income at the moment. .