Bobbo wrote:
50 amp unit is 12kw.
30 amp unit is 3.6kw.
So two 50 amp units plus one 30 amp unit is 27.6kw. Divide that by 0.8 to get the power needed to allow the generator to run at 80% capacity for longevity and you get 34.5kw. Note that this is maximum. You probably can get by with significantly less.
A single 34.5kw generator will probably be more expensive that having 3 smaller generators, one for each RV. Also, having the 3 smaller generators means you are not totally without power to all 3 RVs if the generator conks out.
My vote is a smaller generator for each RV.
^^^^^ This ^^^^^
Although it is unlikely you would ever need the full power unless all were high end units needing lots of power, you would need that full number to match two 50 amp and one 30 amp hookup.