Will your house have electric service? Assuming so, get a temporary construction drop/panel and use that to power your trailer, etc. while building.
If you absolutely must run a generator (nearly) constantly for six months, give careful consideration to what fuel is available and least expensive where you are. You'll use a considerable amount, probably a few thousand gallons if gasoline or diesel, or the equivalent in propane or natural gas. Installing a solar setup may well be less expensive and definitely would be less noisy and smelly; and with that you'd probably just need a small backup generator (maybe 2000 watts or so) to keep the fridge and freezer going in case there are several cloudy days in a row.
