Real numbers, primary sources, no lead capture.
State-by-state payback periods with the math behind each. CA, TX, FL, NY, HI compared.
Who can still claim the 30% credit (2025 installs), how carryforwards work, leases and PPAs, and what still lowers your cost in 2026.
Sizing your system properly — including for EVs, heat pumps, and future electrification. Tables by home size.
Which states still have full retail NEM, which moved to avoided cost (CA NEM 3.0, HI, NV, AZ). Full state table.