I don't really thing that there will be a way to test the inverter SE7600 with one optimizer. As other have suggested, there needs to be a minimum of 8 (I believe) optimizers in a string for the string to work. In addition the inverter needs to be connected to power to work, which I believe would be 240v.
You know John, I have not explained my idea correctly, I want to attach three 250w panels to one optimizer, if you can use 8 optimizers instead of 24 it might save you a considerable amount of money. This be done with 2 panels in parallel, in series with the third it gives 12.5Amax 60vdc at 750w (3X250w) I chose a optimizer (P800) above those electrical requirements. I have several power supplies that will simulate PV panels.
If everything else fails I could always buy 24 optimizers instead of 8. I'm also thinking that less would increase the relialiabilty overall of the system
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