Reddit reviews Aeiusny Portable Generator, 155Wh 42000mAh Power Inverter Battery, UPS Battery Backup for Camping, Emergency, Traveling 110V AC Outlet,3DC 12V,3USB Ports (S360-1)
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If you get a 12 volt fan it will use about 1 amp, so 8amp hours for all night = 20% of carbatt capacity. Some car batteries will only do that every night for a week before they start to suffer, some will do it for a few months.
This sort of thing looks intresting:
https://www.amazon.com/Station-Portable-Inverter-Generator-42000mAh/dp/B074MN6YG3/
"150 Watthours" lithium Ion battery pack (rather good), "100" Watt solar input , built in 100 watt inverter (that's lowish power but still useful) and usb and 12 volt outputs. cost $160
the specification of the solar input may be questionable, limited to 25 actual watts and nominal 13~14 v level (MC4 connector). That may or may not be compatible with nominal 100 watt, 12v or 18v panel setups.
Then you'd just need a $20 12v fan, and bargain lightweight solar panel deal...
"50W" bendable panel kit for $100 ?
There is a "100W" version for $170 - possibly overkill.
1 kilogram, frameless :
https://www.amazon.com/ALLPOWERS-Bendable-Flexible-Lightweight-Irregular/dp/B013DZWDI0/