I have sized many, I mean many for residential dwellings. Right know myself and my neighbor are running off of a 15 kva and we have about 2300 to 2500 square foot houses. You have to be careful when sizing, I have seen a mobile home have to have a 25 kva on a 200 amp service (poor insulation, thin wall, etc.) and have seen many 200 amp houses run on 10 kva pots forever. Diversity is how we get away with the small size pots, also the pots we use have a 150% overload capacity, as well as most in the nation. We don't mind running our residential pots a little hot but our commercial and industrial we limit to 100%.
