According to the FAQ on the Ecoflow DE website, it will be possible to increase the 600W to 800W via a firmware update in the future, as soon as this is provided for and legally approved for the respective country.

"In Germany, is it possible to upgrade the PowerStream micro inverter from 600W to 800W? How can this be done?

With the upcoming adjustments in the German grid connection regulations, it is expected that the maximum grid limit will be increased to 800W in 2023 (please refer to your local regulations and guidelines for specific information). The PowerStream Microinverter is designed to support the transition from 600W to 800W and meet local grid connection requirements.Our EcoFlow customer service team is ready to help you upgrade as soon as the new regulation comes into effect."
Src: en.ecoflow.com/pages/powers... => FAQ

The PowerStream 600 (CH) can use two 400W solar panels (i.e. 800W), but can only feed 600W into the grid, which is the Legal Limit in Switzerland.

You must also register and send the product's certificates of conformity to your electricity supplier, e.g. Romande Energie producteur@romande-energie.ch

The product conformity certificates can be downloaded from the French or German Ecoflow website.
https://www.ecoflow.com/fr... or https://www.ecoflow.com/de... Smart Home PowerStream section

Unfortunately this product is not sold directly by Galaxus but by a third party supplier. It is a marketplace offer. Our supplier does not offer it in the range and we currently have no information on how to obtain this product. I'm really sorry about this. Please do not hesitate to contact our customer service for further details: (Private customers / Product advice) https://helpcenter.digitec.ch/hc...