antinode
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antinode's post in Ade Accenta G4 - Backup Battery Fault Mystery was marked as the answer
I'd put money on it being the battery. Output voltage is only one consideration, it's when the battery is placed under load that it will prove itself. Try checking the battery voltage with it connected to the panel and the mains disconnected. If it's still reading above 12 volts, it's the panel although I'm fairly sure after 4 years, the battery has had it and the voltage will plummet.