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We've got a Fronius inverter but it is 9 years old. No realtime data to an app but there is a memory stick which collects the data and when I submit a quarterly reading I download it to my laptop so I can see info.

You'll need to find out to whom she has been submitting readings. Likely to be whichever energy company she was with when they were installed. As to what you get, that will depend on whether you own the panels. Some people effectively rented out their roof space so a company can put the...