We are using the Hoymiles HMS 1800-4T inverter. It is slightly more expensive than a Deye M200G4 but it is more flexible regarding output control. The HMS 1800 communicates via a proprietary wireless protocol;
a Hoymiles DTU Pro data transfer unit is used to access the inverter(s) via WiFi. We do not the cheaper version DTU WLite because it cannot regulate the inverters’ output power dynamically.
The inverter tracks four panels, generating a peak output of 1800 Watts AC if all four panels (450W) operate at peak power. The firmware (a piece of controller software sitting inside the micro inverter) has the ability to delimit the maximum AC output statically to 600W, 800W or some other value. Technically speaking this forces the power point tracking mechanism of the inverter to move the current power point out of its maximum until the panels only deliver the maxmimum allowed amount of power.
Based on data from a bidirectional energy counter (Shelly 3EM) the DTU can regulate the output limit of the inverters dynamically. Thus it can make sure that the whole system will never feed more than a certain allowed amount of energy (which could even be zero) into the grid.
The Shelly 3EM is optional. If you need it to guarantee low or no grid feeding It must be integrated into your fuse box. This will presumably mean that you need an elctrician for installation. If you can get along with static limitation or do not need limitation at all installation will be easier. A reasonable static limit would be 70% of the peak power (300W for a modern panel of 425W).
This may sound like wasting 30% of your produced energy. But that is not true. Most time your solar panels cannot produce energy at their peak power (400..450W per panel) because there are (1) clouds in the sky or (2) the angle of sun rays is not vertical to their surface or (3) because it is too hot outside. Therefore the limitation of the inverter only clips some peaks. Depending on the individual situation you may lose 3..10% over the year. Clipping those peaks is something what grid providers might want you to do.
continue with legal issues ..