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Lol, dirt cheap? Where? In Sweden, the average price of a solar cell package of 5 kW is approximately 90,000 kr (~ $10,500) including VAT. That's about 3 times the average monthly salary in Sweden

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At my home last year I installed 5kw at 1500 USD. In India. In addition to that I get 100 MBPS unlimited Internet at 10 USD per month. Not to mention my income is about ~1000 USD per month.

With an ROI of <10 years. That's cheap.

How did you calculate that ROI

That doesn't take into account time-value-money nor inflation nor time & maintenance & cost-of-complexity.

These ROI calculations are always way way too generous.

You can use payback time to back into expected returns that adjusts for the time value of money and you need to consider that you're getting expected (investable) savings as well.

Indeed, anything that can pay itself back in less than 5.5 years should be on par with the market.

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