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Research, methodology notes, and the occasional look at how this calculator stacks up against others.

September 12, 2026I Fed the Same Solar Quote Into Six Calculators. Here's What Came Back.I ran the same $300/month bill and system through six free solar calculators and a sourced reference model. The verdicts ranged from a 264% "obvious yes" to cash investing winning outright — almost entirely because of one hidden assumption about exported power.