The panels will put out a fixed max current but whichever Controller "appears" as the lower input apparent resistance will get the most juice IE if the Ctek is lowest it will mean that the Intervolt won't charge up the Lithium first.
In basic terms you have dual loads in parallel to a single voltage source so whichever load is lower gets the higher current flow
Only way you will have any idea what will happen is to monitor the charging current from each reg.
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