lsayre wrote:During the months when we use no air conditioning we consume (on average) 16,738 Watts of electricity per day. But much of that consumption likely comes over only an hour or two per day (when we are cooking and doing laundry). A generator capable of delivering only 14,000 watts per hour might be marginal for our house. (???) It would perhaps take a 20,000 Watt generator to assure that we can cover all of our peak hourly demand needs.
16,738 Watts per day = 510 KWH per month. The electric company (where I live at least) bills you based upon KWH's consumed per month.
16,738 Watts per day should theoretically require about 2.5 gallons of propane per day (on average) at 23.6% efficiency.
Your figure seems to assume that the generator is not running at light or no load. you state that it needs 2.1 gallons at full load, but what does it burn the rest of the time? Does it idle and at what consumption rate or does it run at full RPM all the time? I suspect it will burn double your figure.