Hmm...I don't know why that would be because presumably the rapid shutdown box doesn't know anything about what it's connected to on the output side and presumably both inverters share a common ground if they're located side-by-side. Perhaps the RS box can somehow sense if the inverter is powered up or not in which case if one was powered up and the other powered down it has a problem with that. Best to install per the manual though. Thanks.
@max2k
I'll see if I can dig up some photos of my control wiring.
@max2k
I'll see if I can dig up some photos of my control wiring.
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