MW solar PV packages inverter selection

"It's a heck of a lot of additional labor to hook up 100 string inverters of 10kW vs. 3 or 4 central inverters (which can also be bought in pre-configured 1MW units with some of the connections already done)." - I appreciate that the regulations over the pond may be different to what we suffer in the UK, but I think the principles will remain the same.

We have been looking carefully at both options for solar parks recently, breaking down each connection in components and labour to work out cost savings. The final outcome was that there is more-or-less the same number of connections, but in the cases where you have a few less connections, you have larger cable sizes.

The MW packages that companies are bringing to the market all sound good on the face of it. Speaking from a point-of-view within the UK market and having done a lot of digging, what most companies don't seem to realize is all the regulations, particularly surrounding DC injection current. Most (I haven't found one yet, but I'm sure someone will prove me wrong) inverters over 300kW will not comply with the UK regulations on DC injection current. I know of a few solar parks in the UK that have used Central inverters, and I think that the G59 relays are shielding the issue (again, someone can feel free to prove me wrong), so that the DNO's are not picking-up on it.

This means that within the UK market for solar parks, the string inverter has to be the most cost-effective choice.