At first glance, these two things indeed look deceptively similar, and both are operated via a web browser. The difference is that the web interface is just a locally stored HTML file that allows device access within a local network. To access the local web interface (HTML file) in systems without internet access, download it to your device beforehand: https://download.my-pv.com//currentversionget.php After downloading this file, no further internet connection is required. In contrast, the my-PV Cloud is a web portal on a server that also enables remote access from outside the network. To do this, you need to create a user account and then register the device with its serial number and device key in the my-PV Cloud.