Follow up to the original post...
All is back online at the cabin. Just as a few had mentioned, as soon as I put a 48VDC charger on the battery stack and got the batteries above their LVC (Low Voltage Cutoff), everything took off like it should.
Very happy with the charger I picked up on Amazon. It worked like a charm and seems to be pretty well made.
Now that Current Connected has most of the SOK SK48V100 battery manual out/translated, I was able to get the correct settings for the batteries and update them in the inverters. With the updated parameters, the inverters will now shut down due to "Low Voltage Cutoff" before the BMS shuts down the batteries for the same reason. In theory, I should never have dead batteries again if someone leaves something turned on while we are away and we have no solar.
Very pleased with the Sungold SP6548 Inverters. They ran flawlessly on generator, as they should, without any batteries connected. As it turns out, that is a handy feature.
Thanks to all that replied.
If anyone has any questions, I'm no expert but I'm happy to clarify what I did and how I did it.
Cheers!