Nice find, especially the tri-fuel link. I ran the calculator, just to see where they say I should be on my set up. According to the calculator, running my fridge, freezer, well pump, sump pump, furnace fan (fuel oil furnace), home theater equipment, a coffee maker and two light bulbs I need 8600 continuous watts and 17,000 surge. That's not comparable to my real world experience. I currently run a 5500 watt gas gen with 8550 surge thru my transfer switch with no problems. The longest I've run my gen continuously is 10 hours, but I've had it up and running during about six different outages over the past 10 years. The generator was a c-list find for 350 and the transfer switch was about 75. Easy to wire into my panel myself with the instructions that came with. I built a 20 foot power cable that plugs into the 220 twist lock on the generator and into the transfer switch with parts from Home depot. It's all put away till I need it, where its secured under lock and key. One thing that I considered when doing this myself... do I really need an auto gen with an auto transfer switch? My answer was no. There is no one in my household that requires environmental systems for life support and thereby continuous electrical support. If the power goes out, my alarm panel notifies me and I have plenty of time to get home and fire up the generator before my sump well overflows or the freezer defrosts. We don't need for much more. Companies like Generac that provide fully installed auto systems do a great job, and I would have one if we had the need. But I felt that it was substantially more money than I could justify with our families needs and safety concerns. One lesson learned: depending on where you're at, if the grid goes down, your cable tv and phone will only last 3 to 4 hours. The cable feed relies on repeaters that are battery powered and they only last so long. Have an antennae system in standby for news and weather on the tube.