Current reported for disconnected array? Do I have a short?
Not sure if anyone else has seen this before, but any thoughts what could be happening?
I'm in the middle of redoing the wiring home runs for my primary array. I have parallel strings on my roof that are still paralleled together, but not connected to an inverter, the wires are just hanging out on the roof disconnected.
I see this from the tigo portal. Is there actually power flow happening somewhere in the array? Do I need to worry that there's a short somewhere? My inverter has periodically reported failures in the arc fault self test but I assumed, maybe wrongly, that it was just a defective part in the inverter.
Current:
Power:
-
Assuming that A and B are still connected to each other even without connection to inverter, which apparently, they are - when the 2 strings voltages are not equal (due to shade or angle of the sun, etc.) there will be some reverse current from the higher voltage string back through the lower voltage string.
In this system the voltages are nearly exactly the same much of the time, but not equal at other times. The reason the current in A varies over time is that during the times that the B string optimizers are optimizing, which is reducing voltage to the string and at the same time increasing the current to match other panels in the B string, the B units which are optimizing result in the total B string voltage being less than the total A string voltage.
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