The DC voltage is allowed to rise to well above operating levels during the startup cycle / grid qualification stage. I've seen my inverter hang at that high DC voltage with no output when there was an abnormal shutdown that eventually required re-pairing the optimizers before successfully restarting. Although the optimizers return to 1 V as expected when the inverter is disconnected from the grid or they are asked to shut down by flipping the inverter's toggle switch, there seems to be at least one point in the state diagram in which they are allowed to run high.
After a quick look through my data, I can see another state in which DC voltage is allowed to rise is when the inverter goes into clipping, which may also explain some of what the OP observed in the first post in this thread.
After a quick look through my data, I can see another state in which DC voltage is allowed to rise is when the inverter goes into clipping, which may also explain some of what the OP observed in the first post in this thread.
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