Not every app from the Homey App Store has its own forum topic. The information on what you need to do with the SolarEdge app can be found in the description in the App Store:
To your question: If there are no restrictions from SolarEdge regarding the number of users accessing the SolarEdge account at the same time, then it should be possible to install both apps in parallel, as both apps connect to the SolarEdge Cloud.
My assumption is based on my previous experience with cloud services. I have no personal experience with these apps!
If this doesn’t work for whatever reason, you can use @martijnpoppen 's script [HOW-TO][Pro][Cloud] - Tool to FIX (advanced) flows after removing and re-adding devices to repair the flows if you have to delete the Solar Panels app first and then install the SolarEdge app.
However, there may be problems if the two apps use different types of flow cards. Please inform yourself in the linked topic first.
