if I google for 'BL-SML4860' I find a DC solar charge controller, that's good, nothing to do with the capability's of the MultiPlus. (if your batteries can handle it)
If it would be 2x AC solar inverters, two on the output is too much, but you could wire one to the input side of the MultiPlus and one on the output.
(these questions are hard to answer with this little information)
Yes, they are DC Controllers. Connected directly to a Topband Lithium battery (48V/300ah) trough the Multiplus.
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