Please let me know if Excel export will be implemented in the new version of software. Also other data available in the inverter are good to be exported too (i.e solar power [W]).
You can download the latest version of WatchPower through the link posted below, but it's not specified about the feature you have mentioned above, therefore this needs to be forwarded to the developers in order to see it implemented into the application.
Luckily, the software is still available and the developers are in the business.
Use the following link to reach the page: http://opti-solar.com/english/download.en.html