Convenience became the decision point for me. I bought a gas portable large enough to start/run the deep well pump after an ice storm and power failure when my daughter was a few months old. I kept it well maintained and it served well over the years BUT getting up in the middle of a winter night to go out to the barn, start the generator, wheel it through the snow to the house, dump most of the load via shutting off breakers, and switching over to gen power was not my idea of fun. Coupled with that was the issue of a power failure during the winter when I was traveling was always a consideration.
So three years ago I installed a diesel powered standby generator system connected via an automatic transfer switch. Now if the power fails for more than 3 seconds, the generator starts and goes into a 4 minute warmup cycle before transferring the load to the generator. I can stay in the nice warm house and see the status lights on the transfer switch from my bedroom window and in a few minutes full power is restored for as long as needed. The generator is located in one side of the lower level of the barn which is built into the side of a hill keeping the generator and its fuel supply warmer in the winter and with the windows closed, unlike the gas generator, you can't hear it running. I use the 60 gallon generator tank as fuel storage for my tractor so that the fuel gets rotated; once a month the generator goes through a 30 minute exercise cycle under load.
I ended up installing a 40KW unit, 30KW would have sufficed but the 40KW unit was only slightly more and it came with a more efficient 3.3L Mitsubishi direct injection turbo-diesel with electronic fine control over its mechanical injection pump providing stable 60 hz output. Unlike the gas portable it replaced, the sine wave output of the generator is very clean.
I thought about the PTO generator route which would have been one less engine to maintain but I decided convenience was worth the cost and I am very happy I went that direction.
Rodger
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