Solar InvertersGlobal
String Inverters Explained: Pros, Cons & What to Expect
The traditional and most cost-effective inverter. How string inverters work, their limitations with shading, and when they’re the right choice.
WaterFuelAndSolarEnergy.com Editorial Team Updated December 2024 7 min read
A string inverter takes all the DC power from a series of panels (a “string”) and converts it to AC in one central unit. It’s the most common, proven and lowest-cost topology for unshaded roofs.
How it works
Panels are wired in series into one or more strings, each feeding a single inverter. If one panel is shaded or fails, it drags down the whole string’s output — the key limitation versus microinverters.
String inverter pros and cons
| Pros | Cons |
|---|---|
| Lower upfront cost | Whole string affected by one shaded panel |
| Simpler, fewer components | Single point of failure |
| Easy to service/replace | Large unit needs wall space + DC isolator |
| Long track record | String-level (not panel-level) monitoring |
When to choose a string inverter
- Simple, unshaded roof
- One orientation / single plane
- Budget-conscious buyers
- Installers you trust for support
How long does a string inverter last?
Typically 10–15 years — often replaced once during a panel’s 25-year life. Factor a replacement into your long-term cost.