I set up two battery banks,one for my house, one for my shop, with two invereters as follows- I have an ARGO FET isolator from JackRabbit,two traceC35 controllers, two diodes, and a dump load. I'm on hydro. Charge goes to isolater input,output1 to C35 in solar mode charging the house batteries. Output2 to two diodes (1.5 voltage drop), to shop batteries controlled by C35 in diversion mode.
No charge to shop batteries till the house batteries pass the absorbtion stage,then input rises to 15+ volts, then charge to the shop batts untill charge finally diverts.
I have one set of new batts for the house(4 L16s), and two older sets of batts for the shop (8 L16s).
I'm not sure if some variation would work with one inverter. The price on the FET isolator wasnt bad ($170 or so) almost no voltage drop. I do take a 6% loss to the shop batts due to the diodes, but they keep the new house batts prioritized, and I dump the excess anyway.