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Asking about a proposal isn't the same thing as saying "EAs should do X". There's nothing wrong with asking! (Though more detail is almost always helpful.)
You're actually hitting on a major question in effective altruism here; should we give money now, or invest it in order to give later?
On the one hand, investing lets us wait to see what better opportunities emerge, and increases the total amount we can donate later.
On the other hand, giving now is somewhat like "investing" in the work we support. Giving a charity $1 now could have as much impact on that charity's work than giving them $2 in ten years (depending on the charity's goals, opportunities, etc.)
This is an open question, and the right balance of giving/investing could be very different for different people.
On the topic of investing in solar projects to generate interest: Organizations like Sunwealth already do this. It sounds like your proposal might involve solar projects specifically in areas where people struggle with poverty, which would make it a bit different -- though I also expect you'd have a hard time getting good returns in areas that Sunwealth (and utility companies) haven't already tried to flood with solar panels. But I could be wrong!