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The charge controller is not designed to absorb power it is normally an on or off situation. (sometimes at high speed).
If it was absorbing 3.5A it would go on fire.
I would suggest checking the solar array by shorting it while out of circuit this will determine the mpp current of the array within about 3% at a given time, reconect the array back on to the charge regulator (assuming the sun has not suddenly been covered by a cloud).
If the current is dramaticaly lower than the short circuit current then the battery bank may be controlling the amperage volume, If this is the case there may be a number of reasons for this which would require further info.