Not a problem. THe only issue you could run into is “overcharging the batteries.” This is hard or impossible with lithium, and more of an issue for a FLA battery where they could be limited to max charge of 1/10th the C20 rate. For my 4 large golf cart batteries, this came out to 60 amps.
The load slot will not handle an inverter, but is designed for low amperage devices. IMO, they provide so little power, they should not be on SCCs. The only time a load could be useful is some can run a low amperage light at a programmed time, or will shut off a load once the battery drops to a certain voltage.
Victron is pretty good at giving the max wire gauge that will fit in heir SCCs. I have a 15 amp SCC that is rated for 12 AWG, and the only way I can get 10 AWG in there is to trim the 7 strand wire strands off one at a time until it fits. Probably not a good practice. Perhaps finely stranded welding wire would fit.