I have to run power into the enclosure, probably will put a power strip in there for fans and will need the battery charger that keeps the gen battery topped off plugged in as well. Fortunately I have an outdoor 30 amp RV outlet (single phase) right near where the generator will be so I can use that with short PVC or conduit run.
Surplus Center sells a ton of different 12VDC and 110 VAC fans. I have bought alot of them from them, worth a look. Way cheaper than retain, usually a new take off part.
Have them on the hops drier at least a few hundred hours on them. Intake and exhaust to get them down to 5% humidity and also light heate also which you dont need.