Normally if it is overloaded it just shuts down and the LED flashes, and a USB charger should not overload it. The owner's manual should list any fuses or relays associated with the inverter. The unit itself is located under the brake handle at the rear.

For USB charging, you can easily replace one of the 12v outlets with USB ports.

 

Yeah, 150W is pretty low for an inverter but I doubt the load that you used would have done it. Our laptop uses 65 watts. Look at the wattage of the devices you are using just in case. For a 110V device, the inverted gives you just shy over 1 AMP. Watts=VoltsxAmps.

 

F8 and F20 in the Auxiliary Junction Box under the dash (not BCM).

 

I plugged my laptop into the 110V 150W inverter and it seemed like the receptacle wasn't working so I tested it.

90V engine on; 96V engine off/key on. That's 82 to 87% of outlet rating. It's a lot lower than the 114-126V range for a normal home receptacle. Our Toyota Highlander 120V inverter provides 113V with engine on and zero engine off/key on.

My laptop charger calls for 100V-240V input. Obviously am concerned about damaging it not to mention that it didn't even seem to register that it was plugged in.

If anybody with the 2020 service manual can see what the inverter output is supposed to be it would give me a baseline when I ask the service department to look at it.