Toyota Hilux AC power question - how many devices can I charge / what fuse am I likely to blow?

Hey guys,

Couldnt figure out where to post this thread, so being a 2nd gen owner, Im just gonna drop it here and hope that someone has the know-how to help me plan.

I'm in the middle of planning a trip to Iceland in January. Ill be traveling around the ring road for 2 weeks in a toyota hilux (not sure what year, rental company doesnt provide it but it looks like the current generation). Ill be with a group of 3 photographers who will all be burning through lithium ion batteries that will need regular charging (we are bringing 3 different drones, 4 batteries each, each takes an hour to charge).

I am wondering - how much shit can I charge off of the built in AC outlets and from a cig-plug powered inverter? Am i limited by the alternator, or by a specific fuse?

Hoping to have as many battery chargers plugged in as the system can handle every time the truck is running.

Is there a specific fuse I am likely to fry that I can stock up on a couple backups of before I leave the states?