I assume you have the Solar controller connected directly to the batteries, and the Converter is also connected directly to the batteries.
NEVER connect a converter output to ANY solar controller connections.
That said, the size of the Solar controler is irrelivant. A 50a converter charging is not going to negatively effect the Solar Controller. and vice versa.
The problem is.. the Solar Controller is probably the brains of the bunch, but it will get confused with the converters voltage being applied at the batteries. It is very likely the Solar Controller, esp. a more expensive configurable one, will change stages based on the converters output.
One could go into float, and one could be in Absorb at the same time.
For the sake of your batteries, if possible, your better off using the more configurable charging profile (probably the Solar Controller), however, you dont NEED to disconnect either as it will work.
