..... dont know about ABS humidity???? but while i worked in the Bolivian amazons, we used old 1970-1980 ( dont know the actually name) machines that use to pull air in and retain the moisture, heat and dry the air. To keep medical supplys dry, we used ones powdered by diesel or kerosen, we had a electric one .....but no electricity ( at least not with the right Hertz,omes..etc)
around 3x3x2 ft.
??? just a thought