low power projection

[sQit]

I'm projecting a distance of approx 2m onto the rear window/screen (approx 180cm x 60cm) of a caravan through a dark tent. I'm using a standard 2500 lumens projector on mains electricity. However I want to transfer to a much less power-hungry system using a 12volt or low wattage 240v projector powered from 2x 110 amp/hr batteries with solar panel recharge. What type of projectors would do the job please? All suggestions welcome.
cheers

[alfaleader]

You might consider a mini projector, but there should be very few ambient lighting for this.