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We know that the Acclamator and Venator classes, along with Lucrehulk core ships, can land on planets, but none of these ships can do so without repulsorlift generators. On the other hand, ISDs and larger ships are devoid of such items or have reduced capacity to use them but that's partially due to their inability to operate closer to planetary surfaces than high atmosphere.
How big are the repulsorlift generators onboard these ships?
Based on the evidence of the Star Wars: Incredible Cross Sections and Star Wars: Force Awakens - Incredible Cross Sections, Imperial Star Destroyers and their successor craft don't have any obvious repulsorlift components, nor do they appear to possess the ability to make planetary landings.
Assuming the repulsorlift components on a Venator craft are of a comparable size to those on an Acclamator-class Republic Assault ship then you would expect them to comprise around 5 percent of the total size of the vessel and no more than a few tens of metres in length.
Note that the repulsorlift panels seen in an X-Wing take up roughly the same amount of space.
