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Thanks Gavin, To comply with BS7671 though, if the solar panel circuit is wired pvc t+e cable and buried within the plasterwork (less than 50mm) it must be protected by a 30Ma RCD. As far as I can see, no choice in the matter. Are ALL your LV circuits wired on the surface? Thanksno it doesn't require an RCD.
The inverter manufacturers give specifications for RCD fitting where required by local regulations - ie where required by BS7671, so an RCD is only needed where it's required under BS7671.
All you're doing is adding a source of nuisance tripping to the system by adding an RCD where it's not needed.