Architecture difference
In string architecture, several panels are grouped together and connected to a central inverter. In micro architecture, each panel has its own converter. The thong is more simple and often less expensive; the mic offers superior granularity and flexibility.
Monitoring and maintenance
Panel monitoring is native on microinverter solutions, making it easier to fine diagnosis in the event of a drop in performance. In string, tracking is often by string, unless additional optimizers or sensors are added.
Electrical safety
Both architectures can be compliant and secure if properly designed. Microinverters reduce the length of high-voltage DC portions on the roof; the Modern string architectures also incorporate advanced protection functions.
Which option to choose in Switzerland?
Simple roof, tight budget: string. Fragmented roof, variable shading, monitoring requirement detailed: microinverters. The right choice depends above all on the geometry of the roof, the uses and of the future expansion strategy.