A home solar system has three jobs: turn sunlight into electricity, make that electricity usable, and settle up with your utility for the mismatch between when you produce and when you consume. Each job maps to a piece of hardware.
Panels: the production side
Solar panels are the only part most people picture, and the simplest to understand. Photovoltaic cells convert sunlight to direct-current (DC) electricity. Residential panels today are typically rated around 400–450 watts each, carry 25-year output warranties, and degrade slowly — around half a percent of output per year. A typical US home installs a system between 6 and 10 kilowatts, meaning 15–25 panels.
Production depends far more on your location, roof orientation, and shading than on panel brand. A south-facing roof in Arizona and a shaded east-facing roof in Ohio can differ by 40% or more per installed kilowatt. The NREL PVWatts calculator models this for your exact address, free.
Inverters: the translation layer
Your home runs on alternating current (AC), so every system needs an inverter to convert the panels' DC output. The choice is between one central string inverter (cheaper, a single point of failure, shade on one panel drags down its whole string) and microinverters on each panel (costlier, panel-level monitoring, shade-tolerant). Inverters are also the component most likely to need replacement during the system's life — string inverters usually carry 10–12-year warranties versus 25 for micros, which is worth pricing into any quote.
Batteries: optional, and a separate decision
A battery does not make your panels produce more. It shifts when you can use what you produced, which matters in three cases: your utility pays little for exported power, you want backup through outages, or you're on time-of-use rates with expensive evenings. Batteries add roughly $10,000–$15,000 installed, so treat them as their own cost-benefit decision — our is-solar-worth-it breakdown covers when storage math works.
The utility: your invisible fourth component
Almost all home solar stays grid-tied. On sunny afternoons you export surplus; on winter evenings you import. How your utility credits the exports — full retail rate, avoided cost, or something in between — is set by your state's net-metering rules and often changes the economics more than any hardware choice. That's the subject of our net metering explainer, and it's the first thing to check before you request quotes. You can estimate the whole picture — system size, cost, and payback — in the Solar Savings Calculator.