Saw whole house systems frequently in the DFW area of the high dollar homes. 50kw+ was not uncommon at all. We did one house that had a 600 amp service and a transformer in the yard. We pulled multiple 750 MCM cables 500 ft from the utility to their yard. They wanted a whole house backup but the city the area would have to be zoned differently to accommodate the genset and fuel supply. They settled on a 100kw and ran dedicated lines. The entire AC system was on it.