String inverters vs microinverters vs optimizers
Decisions built from Microinverters / optimizers and Central string inverter — editorial analysis, no sales stake; each figure sourced or labeled in review.
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 / optimizers | Central string inverter | |
|---|---|---|
| Shade tolerance | Per-panel independence | One shaded panel affects the series |
| If one unit fails | Only that panel is off | The whole string is off |
| Typical warranty | 25 years (in review) | 10-12 years (in review) |
| Upfront price | Typically adds to the quote (in review) | Typically the cheaper box |
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.
Where these figures come from
Federal credit rules from the IRS (accessed 2026-08-08); market prices from EnergySage 2026; export rates per state records cited on each state page (CPUC NEM 3 for California); typical-home usage EIA 2023. Anything verified carries its date; the rest says "in review" until confirmed.