Out of interest, since you`re talking about 3.5kw output, can you tell
me what protection system you`re using ? (G83/1 applies I think, but i`m
not sure whether you`re looking to interconnect back to the mains
network)
Can you tell me what sort of system YOU'RE using?

I`m not, hence the question - although I do have an interest in how it
all hangs together (or not !)