Steve said:
I have a fair amount of equipment around (tractor, bobcat, pickup, 4 cars), so short of the apocalypse I have enough gas to keep a 10hp motor running for a few days. I was mainly looking into efficiency, maintenance, reliability, that sort of thing.
Steve
One question you skipped over though was $$$ range. What are you wanting to spend "to keep the lights on". Also are you out in the country or fairly urban???
If you live out in the country (and have a well) 6500 watts is a good 'baseline' to start at. If you live in the city? You might be able to get by with 3000 watts. If you live in the city and most of your house is NG (heat, stove, HW etc) you could go buy a little 1500watt whisper quiet Honda and let it run all night.
It all depends on your situation.
A 6500 watt OHV engined generator is short money compared to a hard piped, fixed in place GENSET. Once its bolted down it becomes a 'GENSET' big difference in price...and what it takes to hook it up...as well as maintain it.
While everybody "sings the praises" of NG fired gensets...take a close look where you live. If your neighborhood is fed from a high pressure gas transmission line with the regulator assembly sitting right next to a light pole that feeds the whole town and it happens to be the busiest intersection in town...(you know where this is going)... How upset would you be if the lights were off and had no NG???
Secondly when it comes to NG fired gensets the $$$ figure for maintenance comesd into play. A NG fired engine takes more of a 'beating' than a diesel one.
If you wanted to go the genset route I would suggest diesel vs NG or even propane.
NG is not 100% reliable. Legally required stanby systems (such as hospitals or other critical care facilities) cannot be solely on NG as a fuel.
If you are fairly 'handy' and well versed (burning wood kinda qualifies you for that) I would size up how big of an electrical load you have and go with a portable generator. Have a Gentran style switch installed (6 or 12 circuit) model and pick the circuits in the house you would want "in case of a power failure". One kitchen circuit is always adviseable..(fridge and microwave...at least you can make some hot choclate/coffee).
If you have a garage have the electrician look at putting a "remote generator tie-in" closest to the best suited door so you can roll the generator outside and plug it in as close as possible.
One thing I definately want to mention as a word of caution:
I know there are probably some right here on the forum that have made a "double ended cord" to get by cheap and nice and easy...but it is very dangerous to do this. All it takes is forgetting one time to turn off the main and you could in-advertantly kill the people trying to put the lights back on for you....Never use a double ended cord.
I installed a few "generator hook-ups" over the years...the Y2K scare was very good for business (to bad I was an apprentice at the time)....
As is always said...a few more detrails and pictures would go a long way to helping you to decide the best option.