Three phase Solar Power for commercial use

Hey everyone,

I'm currently designing a three phase solar power system for commercial use. I've pretty much decided on using (24) Kyocera KD205GX-LP panels, (3) Fronius IG 2500-LV inverters, (3) Delta LA602 DC Lightning Arrestors, (1) Delta 303R Three Phase Lightning Arrestor, (1) Square D AC Disconnect DU321RB. I'll also need a panel to combine my three inverters.

There are a couple of things I'm unsure about.

How I'm going to mount it for one. We have one south facing roof but the angle of the roof is no where near optimal. We do have a ton of land if I wanted to do a ground mount and the location would be impossible for vandalism or theft.

Code is another portion. I don't know if the disconnects contained within the Fronius inverters are up to code. I know that I will need a disconnect capable of being "Locked Out" per OSHA rules on the AC side but I'm not sure about the DC side of things. Going along with code, how would I ensure that all of the equipment is properly grounded.

I'm very confused by grounding the equipment. I've read the NEC Code about 10 times and I'm just confusing myself. Can someone give it to me in Laymen's terms.




My plan is to wire 8 panels in series to each inverter, then have each inverter wired to my "AC combiner panel" which following the directions Fronius gives to wire in 3 phase. Then I'd run my three phase power from my "AC combiner panel" into my AC Disconnect and from there into my main panel. The only other question I have is where do I need fuses/breakers other than where I connect to the panels?