This might explain why you aren't getting quality feedback from the tech service department. Garbage in = garbage out.
Transformers are possible. We use them all the time. Was that it?
Oh snap! Right on however. If we don't know what he's trying to do, how does the SE guy that said "get this xfmr" know what he's doing?
zman990
I don't need any feedback at this time I have a manufacturer quoting what solar edge told them I need I will have it next week
Ok, now I'm seriously worried, and I'm the guy with the least credentials!
Seriously, dude- does this SE/SolarEdge person know that your *SERVICE* is 120/240V 1ph and not just a little bit of loads, like under 10kW of 120/240V loads?
The only way I can see a 75kVA 480V delta ---> 120/240V center tapped xfmr working for anything you're talking about is off of a 480/277V panel.
As in 480/277V panel ---> your xfmr ---> loads.
Which would mean you'd *have to* have 480/277V service.
You have three big problems:
1. You are talking about 66kW of PV output. That's also 66kVA. You have 120/240V service, possibly 416 amps of 120V (50kVA). Ok. Look--->66,000 / 120V = 550 amps. You can't put 550A thru your 416A service transformer. You don't pwn it!!
2. You are talking about 3 phase inverters that say MEDIUM VOLTAGE XFMR REQUIRED in their installation manual- 120/240V 1ph is not MV!
3. You haven't talked to your POCO! If you did, they'd tell you that you have the wrong service AND the wrong xfmr for your inverters!
Let's review those...
1. Your service is too low of a kVA for your inverters.
2. Your inverters are the wrong phase for your service.
3. It won't work! :happyyes:
Even if you wanted to use 6 of the 11.4kW 1ph SE inverters, or 68.4kW/kVA at 120/240V, your POCO would still say you have to get a single 75kVA service transformer instead of the 50kVA one you have now.