They provide a total solution
They have a 'kit' that has solar panels, inverter, batteries, cabling etc.
The AC unit can be setup to run only on solar, of course. Once the sun is gone you have whatever 'cold' sink you have left + power backup to drive compressor and your done.
The prices I saw ~$13K and more seemed a little high.
In my case, I have 2000 Watts solar and 450 amp/hour batteries at 48 volts. I should be able to make it through the night easily.