I almost exclusively fit SMA 3000HF and 4000TL inverters.
I always install then notify under G83-1 after the install. I put the output at 16A and Short circuit at 16A and I've had no problems.
The earthing of the array frame was a bit odd at first but now it's second nature, we can sink an earth pit, fit a rod and test it in no time. We run a 10mm earth by the same route as the DC cables and sing the earth near the house. We use a 10mm SDS bit 1m long to drill through all the rough stuff including random foundations and building debris tap in an earth rod the first meter down the drilled hole then bash it as far as we can the rest of the way. We do an earth loop test from the extension lead, nice and easy less than 100ohms from the extension lead. If no cigar then we drill at a different angle and sink another in the same hole and link the two together and test. We carry a spade, sand and cement and a trowel in a trug in the van, takes about an hour to make a really tidy job.
Once you've got this sorted then you can sell the more efficient twin MPP 4000TL inverter with gay abandon, dual pitch arrays no problem, the 4000TL handles different sized strings really well too so 10 panels here and 6 over there is no problem.
Make the leap, it's worth it, only down side is the 4000TL requires fiddling around with an allen key to get the cover off!!!
