Any way to safely test if an AC-DC converter can accept DC input?

[TimNJ]

Just generally speaking, if there is a fault which should cause a fuse to blow, the AC rated fuses may not be able to interrupt DC. DC is pretty hard to interrupt by comparison, so you should always check the specification of the included fuse(s) and check if they have a DC rating (with ample breaking capacity). If not, you should consider adding a proper DC rated fuse, with enough breaking capacity for the prospective fault current of the installation.

Thanks for the suggestion! Thinking about it, this should only be an issue on the input side right? After that it'll all be the same inside the OBC. However coming from PV panels their Isc is only about 10% higher than Imp, so not much for a fuse to do there. OK well sure, if I had a bigger array than the OBC could use (over ~7 kW / 32 A Isc) then this would be possible... that'd be a nice problem to have

To be honest, I did not read this whole thread in great detail, but it was just a general piece of advise. I'd guess that a large percentage of (switchmode) AC-DC converters, which work by rectifying AC first, are compatible with DC input. Maybe there are a handful of controllers/designs which will freak out if they don't detect a zero-crossing. Hard to know. If you test it and it works then...I guess it works?

And to answer your question, yes, only matters on the input side...otherwise it's all the same internally. My point was: Whatever AC rated fuse was originally specified/included in the equipment is not necessarily capable of breaking DC, if a fault situation arose. Same applies for circuit breakers, contactors, and switches.