What equipment would I need to take pictures of art in a storage unit without electricity

As titled I need to take pictures of a big body (hundreds) of paintings and drawings which are stored quite remotely in a small storage unit. There is lighting in the hallway there but no lighting or electricity in the unit itself. The images are for someones personal archiving so don't need to to the highest spec.

I figured I would need a light source and battery pack, softbox, tripod for the lamp. Tripod for the artwork.

I have a camera and lens with pol circ filter already and know how to do exposure correctly without studio lighting (but not with).

Would love some tips on needed gear and how to get decent lighting in a tight space, while unfortunately also working speedily (there are hundreds of artworks to proces).