I have had my system about three and a half years, 12 panels and a 48v battery composed of reconditioned traction cells. I live in Spain, today was a bit cloudy so I only made 5.43KWh, yesterday was over 8KWh more than I use.
I have no choice as the nearest grid supply is over 3Km from me, running new poles and cable would approach six figures going by the conversation I had in the Eberdrola office.
I have few problems, just have to keep an eye on the electrolyte and keep a genny on standby in case of more than three days of solid overcast, something that has not happened so far.
My biggest problem was in the beginning, the idiot who made the panel frames was not remotely a welder so the first big blow ripped the lot apart, the supplier had to replace 4 panels and I made him pay me to reconstruct the frames. My belt and braces rebuild has so far withstood gusts that bent my neighbour's TV aerial mast.
Nobody I have spoken to who has a hybrid 'grid and panel system has gained by it, better to go off grid so that the power co's can't screw you.