You can check this app online here: https://koshka.ddns.net/pzemweb/v1.1/ (You will need Chrome browser or similar )
A web-app (web-interface) for Peacefair PZEM energy monitors.
It is loaded from https web server but works completely on a local machine with local devices and local database.
It uses Web Serial API to connect to PZEM devices and IndexedDB to store data.
JqGrid and Apexcharts used to display stored data.
This application (hopefully) supports simultaneous data exchange...