The converter should have a built in "smart" charger, so a battery tender would be overkill. Most newer converters do have chargers. I always used 14 wires just in case more fixtures might be needed (plus a 10amp fuse). You can run the lights on one set of wires and one fuse.
Also consider adding a Fantastic Fan and water pump. The pump and cigar plug can be run off the same circuit, as the pump only runs intermittingly.
I have been researching solar generators lately and am looking at the Bluetti 200max. Do a lot of study before your purchase. Youtube has some great videos. Some solar generators have phantom loads and will discharge quite a lot overnight. This can be remedied by turning the unit off but it has been annoying some buyers.