The problem with a diesel generator is fuel. Diesel fuel has a very short shelf life, and there are no good fuel stabilizers. Diesel fuel is hydroscopic, so water in the fuel tank is constantly a problem, and that water grows algae. The water and algae stay on the bottom of the fuel tank, which is where the fuel tank pickup is, so the water and algae go to the motor first. There should be a substantial fuel water separator with a filter, but the longer the fuel has been in the tank, the shorter life expectancy of the filter and the more often the water separator will have to be drained. Propane is the way to go if you want to store enough fuel for a whole house generator. For hurricanes I use a portable 10K gas generator. I keep fuel stabilizer in the tank and start it up every other month. When a hurricane gets within a few days, I fill up my 45 gallon fuel barrels. If the hurricane doesn't come, I use the gas in my cars.