The most straightforward way is to use network rendering, even on a single computer and add a batch job. Open Monitor, Manager, Node, then in Monitor, Job>Add>Batch job. Multi select all the mxs files you want to render, choose rendering mode (cooperative or single in "Batch type" setting doesn't matter if you're only rendering on one machine). Choose your settings etc and start the job. It will go through each one rendering at the specified SL.
Second option is via scripting which might be faster setting up if you just place the MXS files you wish to render in a folder. Check out the script "batch_render" from Scripts>Load script inside Maxwell Render. Just change the input/output folders and probably you'd want to delete the lines:
Code: Select all Scene.setResX( 400 );
Scene.setResY( 400 );
and adjust the:
Scene.setSamplingLevel( 8 );
Have fun

Maxwellzone.com - tutorials, training and other goodies related to Maxwell Render
Youtube Maxwell channel