Solar States

Compare · X vs Y

String inverters vs microinverters vs optimizers

Decisions built from Microinverters / optimizers and Central string inverter — editorial analysis; each figure sourced or labeled in review.

Side AMicroinverters / optimizers
Side BCentral string inverter
FrameBuyer-side · no sales stake

All three boxes on your roof do the same job — turn DC power into usable AC. They differ in where the conversion happens, which panels can survive shade, and what breaks if one unit fails.

At a glance: Microinverters / optimizers vs Central string inverter

Microinverters / optimizersCentral string inverter
Shade tolerancePer-panel independenceOne shaded panel affects the series
If one unit failsOnly that panel is offThe whole string is off
Typical warranty25 years (in review)10-12 years (in review)
Upfront priceTypically adds to the quote (in review)Typically the cheaper box
Microinverters / optimizers · 2 reasonsCentral string inverter · 2 reasons

Each side's reasons below are one per line — the bar just scales those lists, no weighting.

When Microinverters / optimizers wins

  • Complex rooftops with trees, chimneys, or shifting shading through the day.
  • Each panel works at its own optimum — a good fit when some modules are on different roof faces.

When Central string inverter wins

  • A simple, unshaded south- or west-facing roof that stays constant.
  • Fewer parts on the roof, one box to service, and usually (in review) the lower price per watt.

The honest verdict

Your roof's shade pattern, not the brand, decides. Simple open roof → string or optimizer. Complex or shaded → micros earn their premium. Whatever you pick, get the inverter warranty from the installer in writing, and ask the $/W for all three options before comparing.

Run the payback estimator → Compare price-per-watt → Open your state guide →

Where these figures come from

Source review: 2026-09-21. These sources support financing risks and tax distinctions, not a price or savings guarantee.

Questions homeowners ask

How long does an inverter last?
Most string units have 10-12-year warranties (extension optional); microinverter brands now offer 25 a year. Warranties are the honest proxy because electronics age faster than panels (NREL-type data, in review).