Do Not Trust Any Long Term Gurantee
Like so many companies today that are praised by our elected governments as being, "Free-enterprise rising to the challenge of demand", they are just "Here Today And Gone Tomorrow". To be fair I never thought that a 10 year guarantee would be valid unless it was perhaps backed by some form of independent insurance but there are other factors.
Most breakdowns are caused by the invertor. The 'Aurora' Invertor (say the 3.6 version) selected by PVsolar UK had a real design fault in respect of where a printed circuit board track(s) connected to one or more relay pins (error 031). It looked as if it had been designed by first year University students with no worldly electrical/electronics experience, and I say this without any hindsight.
Aurora sold out to ABB (how convenient), and ABB faced with repairing legacy equipment does not respond to queries regarding this subject - although one could try 'social media' to take them out of their ignorance and arrogance? Consumers would have expected that any takeover would have been factored into the cost of a product legacy as good business practice but private enterprise has become so greedy within Europe they just don't care anymore. It is greed, greed and more greed plus fat salaries.
The time has arrived for the consumer champion "Which" to lobby our governments into ensuring that long term guarantees in all such matters are kept by forcing these fly-by-night companies into inserting money into an insurance pot with a time trusted insurance company. It will cost the consumer a bit more but many already cough up extra regarding extended warranties for inverters in any case.