1. why u would want to do it any other way for larger ground mount.
2. Main issue is 1000volt dc on property zoned at residential.
3. The solar edge inverter is 33kw 480/277 .... I went with 112.5 kva
4. I am going to make my long run with 480/277 instead of 240/120.
5.
https://www.google.com/search?q=sol...ndroid-att-us&sourceid=chrome-mobile&ie=UTF-8
The data sheet for 33kw solar edge. The max continuous output is 40 amp@220 so 40a*1.25 for breakers so 50 amp breakers would be used to combine before landing transformer
5. Dude- seriously. From your link. It doesn't say it supports 120/240V grids anywhere.
Data sheet-
SE33.3K
(REQUIRES MEDIUM VOLTAGE TRANSFORMER) // Grids Supported - Three Phase 3 / N / PE (WYE with Neutral)
Plus, 480V to 240/120V is *not* a MV xfmr!
1. I am doing it another way in one case- getting 480/277V service for the 480/277V inverters. Not SE inverters, SMA.
So there are no xfmr losses on customer side going from PV to grid. The farm's loads are 120/240 split phase, but almost all the motors say 208V on their plates, so 45kVA of xfmr with 208/120V 3ph secondary for the 25kVA max of loads.
2. Check your local zoning- a real farm can be in a residential zone, but there are agricultural "variances". I mean as in, if the farm is incorporated as an agricultural business, the farm buildings aren't dwellings.
Aren't you inverters going outside, so all of the 600+V wires will be outside?
Also, look at page 2 here, about Section 101.31.
http://solarenergy.advanced-energy.com/upload/File/Application Notes/ENG-600vor1000V-260-02.pdf
3. A 112.5kVA xfmr for TWO of the 33kW inverters? No!
As iwire pointed out-
the single-phase load should not exceed 5 percent... Additional loading beyond 5 percent may cause the transformer to overheat and fail.
Your 112.5kVA xfmr can only handle 5.625kVA of 120/240V!
You'd want a 1500kVA xfmr- 5% of that is 75kVA, enough for your 66kVA of PV.
The largest 480V to 240/120V xfmr I can find is 750kVA.
BUT- you have three or four engineers (and myself) telling you that what you want to do isn't possible. Even if it was, that would be WAY too much $$!
4. I have to say that doing the long run at 480/277V and then stepping *down* the voltage sort of defeats the purpose of doing the run at higher voltage- you'd want to step UP to the grid at that point (especially with a line/supply side connection!) and step down for load only.
5. 66kVA of 480 3ph PV output = 550 amps at 120V. You can't land that with 400A service, which is a 50kVA xfmr.
You have to get a 75kVA 480/277V service minimum. My engineer recommended getting 150kVA of 480/277V service for about the same amount of PV as you are installing, so the PV will be easily "expandable".
The SE inverter specs say "MV transformer required" - I read that as you can't even use a 480/277V to 208/120V step down xfmr for the 480/277V inverters and a 208/120V service..