X3..I have exactly that all wired in together with two Blue Sea switches two separate solar systems one roof top one portable with separate Morningstar controllers.
I can have both charging together or separate.....I just completed a 17 day test in two B.C Provincial parks under varied weather conditions and was pleased to find that the battery's worked well together and even the two controllers seemed to talk to each other.
With 150 watts portable and 213 rooftop flat I was in regulation by mid morning and float in early PM and that's with approx. 100 amp hrs daily use.?...50 for one week,portable Engle freezer.
The two battery banks are new so that might help but any time I isolated one from the other I always came up with an equal voltage reading......I ended up just charging and using both together as one big 330 ah bank.
Hope I'm not hijacking this thread with my ramble.