Powering 2 Delta Pros with External Battery: Latest Update

It's been a little while but I'm back with the latest update on trying to power two Smart Home Panel-connected Ecoflow Delta Pros from a single external battery bank along with the Calpha 5KW Solar Controller/Inverter. In this video, I connect both of my Delta Pros with two separate power switching supplies on separate plugs and we see what happens!
You can watch the full video for the complete behavior but I can summarize here. Sadly, no, it doesn't quite work. The limitation appears to be completely on the Ecoflow Delta Pro side and not on the Calpha Solar Controller side. From an output capacity of the controller, we weren't even close to touching its maximum (running about 3.4KW load). However, the Delta Pros started acting for oddly, almost like when I tested trying to "split" a solar array among the two Delta Pros. Both would charge but the wattage would vary and reverse between them, ramping up and down alternately.
I did a couple other tests where I put more load on the Calpha Solar controller and confirmed it wasn't an output limitation but rather a weird quirk of the Delta Pros. Although it didn't work like I wanted, it was still a good learning experience. I have a few other ideas in the hopper so stay tuned!
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[@tlteal]

I have a Delta Pro that is doing almost the same thing. Despite having an XT60i connector the watts bounces all over the place. When I put it on another Delta Pro, it is solid 800 watts. I think it has to do with when they were made, the build dates, parts, etc.

[@jaysonstebbins2539]

2 mppts are always a problem. I think that may have been the issue?

[@DanielGoodwin-jq1oc]

In this case I didn't think it should still be an issue because they are being powered by two separate circuits and two separate power supplies from the Calpha Solar Inverter. Now, that isn't to say it wasn't an issue because their behavior certainly acted as if it was that. I'm not sure if there is a way to isolate the power source so its not shared in anyway (other than of course two separate battery banks).