Originally posted by ericy
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So you should have 39 optimizers and with 39 of them, I would expect a string of 19 and a string of 20.
So if you didn't have them tied together inside the inverter, I'd expect to see one of them with 19V, the other with 20V. But the +'s and -'s are connected together inside your inverter, so I would expect you would see either 19V or 20V (and I don't know which)
I would expect to see 4 wires coming into the inverter from the roof. (A pair of wires for each string.) But it is possible to combine the two strings before they come down from the roof.
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