Guides
How to compare solar quotes per wattA step-by-step way to put solar quotes on the same footing: the per-watt calculation, a worked example, and the questions that stop apples-to-oranges comparisons.How to read the Tracking the Sun dataWhat this national laboratory data set contains, where it comes from, how we filtered it, and the limits to keep in mind when you read a profile.How to check a solar installer before you signLicensing, insurance, references, contract terms, financing and warning signs for a solar installer, with where to look in your state.What affects the price of home solarSystem size, equipment, roof, labor, batteries, financing and location: why two quotes for the same house can differ, and how to ask for numbers you can compare.