Microinverters vs. String Inverters

The Core Dilemma

Solar panels produce Direct Current (DC) electricity, but your home and appliances run on Alternating Current (AC). An inverter bridges this gap. The decision between microinverters and a central string inverter dictates how your system handles shading, monitoring, and future expansion.

Central String Inverters

In a string inverter setup, multiple solar panels are wired together in a series (a "string"). The DC power from all these panels is sent to a single, central inverter box—usually mounted on the side of your house or in a garage—where it is converted to AC.

• Pros: Proven, reliable technology. Generally the most cost-effective option. If the inverter fails, it's easily accessible for a technician to replace without climbing on the roof.
• Cons: A string is only as strong as its weakest link. If one panel in the string is shaded by a tree or covered in debris, the production of the entire string drops to match that underperforming panel.

Microinverters

Microinverters (popularized by companies like Enphase) are small inverters attached to the back of every individual solar panel. The DC-to-AC conversion happens right on the roof, panel by panel.

• Pros: Independent operation. If a tree shades one panel, only that panel's production drops; the rest of the array continues operating at maximum capacity. They also allow for panel-level monitoring, so you can see the exact output of every single module in an app. They make future system expansion much easier.
• Cons: Higher upfront cost. Because there are electronics attached to every panel in a harsh roof environment, there are more potential points of failure, and replacing a failed microinverter requires a technician to get on the roof and lift the panel.

Which is right for you?

Choose a String Inverter if: You have a simple, south-facing roof with absolutely zero shade from trees, chimneys, or neighboring buildings. If conditions are perfect, string inverters are highly efficient and save you money upfront.

Choose Microinverters if: Your roof has multiple angles (e.g., some panels facing south, some facing west), you experience any shading during the day, or you anticipate wanting to add more panels to the system in the future.