Microinverter

A microinverter is a small inverter mounted directly behind each individual solar panel, converting DC to AC at the panel level rather than at a central location. Each panel operates independently with its own MPPT optimization, eliminating the string-level shading limitations of centralized string inverters.

The panel-level independence of microinverters means shading, soiling, or degradation on one panel has zero impact on the output of neighboring panels. In installations with partial shade from trees, chimneys, dormers, or neighboring buildings, microinverters can harvest 5-25% more energy than a string inverter system because each panel extracts its own maximum power regardless of what is happening to other panels.

Microinverters also enable panel-level monitoring — you can see the real-time production of every individual panel through a web dashboard or app. This makes it easy to identify underperforming panels, spot wiring issues, and track system health at granular detail.

Safety is another advantage. Microinverter systems operate at AC voltage on the roof (typically 240V), eliminating the high-voltage DC strings (300-600V+) present in string inverter systems. This reduces the risk of DC arc faults and complies easily with rapid shutdown requirements for firefighter safety.

The trade-off is cost and complexity. Microinverters cost more per watt than string inverters and place electronics in the harsh rooftop environment — exposed to heat cycling, moisture, and UV. However, leading manufacturers like Enphase have demonstrated strong long-term reliability with 25-year warranties, and the per-panel production gains often offset the price premium over the system's lifetime.