What happens when pulling 160A out of a busbar rated at 100A?

I bought a BusBar from Amazon to parallel connect 5 batteries in my cabin. It is rated at a 100A. I will normally never pull anything close to that out of the batteries, but I have a 1800W non-adjustable vacuum, and I am pondering if I should run it off the batteries using an inverter. Due to normal inefficencies of an inverter, that would probably pull 2000W, equivalent to about 160A at 12V, quite a bit more than the rated max.

I am wondering if this will make the metal on the bus bar so hot it will become a fire hazard? Usually I am done vacuuming in 15 minutes. Usually, any rating is done with a bit of overhead, so maybe 100A means it gets to 20 degrees C, while at 200A it becomes quite hot (like 50 degrees C)?

This is how the bus bar looks: