There are a few bits of knowledge needed to provide a good response for the cables.
First: How long of a run of cable will it be?
Reason: The longer a run of wire you use, the thicker in needs to be so carry the load farther. So the longer the run the thicker the cable. 600v cable can easy fall apart from 240v if the run was long enough. ALSO to consider, you can also lose some voltage if the cable is too big. If you run 12 volts through 4/0 cable at 3 feet you'll lose quite a bit of your current.
Second: Is this cable solid, or stranded, or coated
Reason: if the cable is solid it is more apt to hold up to switching and heat, however there is a larger amount of current loss though that huge chunk of copper. However if it is stranded it can melt easier with heavy loads, or inclement weather conditions, also more susceptible to corrosion.
Initial assessment: Currently it sound as if the wire will work for your application, however the variables list above can change this.
Optional assessment: Perhaps a smaller wire would serve better, less of a change of voltage loss, and probably easier to maneuver and handle