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Definition
A string inverter is a single central inverter wired to a "string" of solar panels, converting their direct current (DC) into the alternating current (AC) your home uses. It's the most common and lower-cost option compared to microinverters, which is why many residential systems rely on it. The tradeoff is performance: because the panels are wired in series, one shaded or underperforming panel can drag down the output of the whole string. To work around this, installers often pair a string inverter with power optimizers mounted on each panel, which help manage individual panel performance while keeping the cost advantage of a central inverter. Whether a string inverter makes sense for you depends on your roof's shading, layout, and budget. Pricing and product availability typically vary by installer and region.
Also Known As
Central inverter
String solar inverter
String + optimizer system
Series inverter
Used in Context
- Because his roof gets no shade, the installer recommended a string inverter to keep the system cost down.
- Her quote paired a string inverter with power optimizers to limit losses from a chimney that shades a few panels.
- A homeowner comparing bids through Dreamy Leads asked whether a string inverter or microinverters made more sense for a partially shaded roof.
Are string inverters a good choice if my roof has shade?
Often not on their own, since one shaded or underperforming panel can drag down the whole string's output. If parts of your roof are shaded, installers frequently pair the string inverter with power optimizers on each panel to reduce those losses while keeping costs lower than microinverters.
Why do installers add power optimizers to string inverters?
Power optimizers are added because a string inverter ties panels together, so one weak panel can reduce the whole string's production. Optimizers manage each panel individually, helping recover output lost to shading or mismatch, while still keeping the lower-cost advantage of a central string inverter.
Is a string inverter cheaper than microinverters?
Yes. A string inverter is typically lower cost than microinverters because it uses one central unit instead of equipment on every panel. The savings come with a tradeoff, since a single shaded or underperforming panel can reduce the entire string's output. Actual pricing varies by installer and region.
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