EDIT I just noticed the shipping cost is $400 bringing the total to $900. That is still better than most of the typical offerings that are mostly all AC-powered and 13K BTU.
For $500 this is an interesting integrated unit that weighs about 70 lbs which is 600W at 12V which is just over the typical 500W of a 5K BTU getto window air conditioner.
Compared to the getto solution this is equivalent to the smallest 5K wind unit but it runs off of DC at either 12 or 24 volts so you are saving 20% by not having to use a 12VDC->120VAC inverter.
It is still a bit much for a 200 amp-hour lithium battery where you might get close to 4 hours of maximum run time without having to run your engine. If it was really hot then you could bolster the power levels running the engine and use Dash air as well.
"In short, how many BTUs is 1,500 watts? 1,500 watts is equal to 5,118 BTUs."