Yes, two strings of 4 panels is the way to go. Each to its own controller.
I'm also using a MPPT controller to charge my 12V system from the 48V bank. In my case a 100/15 as I had it on hand. It occurs to me, one could use a 100/20 to charge to 48V system from the 12V system if the need arises. Although I've not tried that yet.
I have 8 x 100 watt flex panels charging my 48 volt battery bank with 2 x Victron 100/20 48 volt MPPT solar controllers. I think you will be much better off with 4 panels in series to each controller and then parallel the controllers.
I run the solar banks port and starboard so most shading degradation only affects one or the other solar bank at a time. A shadow on all or part of any panel drops the output of the whole series string.Slightly off topic…I am using a left over 12 volt smart solar controller as a DC-DC converter for charging my house bank from the traction bank. Charge parameters can be monitored and controlled with the Victron IPhone app. This works really nicely.Remember….no welding!
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