Posted by jdemaris on October 02, 2008 at 08:39:22 from (67.142.130.24):
In Reply to: PTO Generator Question posted by Jonaspear on October 02, 2008 at 06:13:16:
The only gensets that can be run at any RPMs and still make 60 Hertz AC power are DC units with built-in full-wave inverters. Plenty around for sale but pricey. Anything else must be run at one set RPM. And, when it comes to fuel efficiency, they all need to be load-matched to come anywhere close to being efficienct. So, a 10,000 watt generator will be terrible when run at a 1000 watt load, etc. The most efficient way to use a big generator for mixed loads is to have a battery bank, inverter, and genset. Then, only run the genset at full load for a short time to charge the battery bank when needed.
For the kind of part-time, ad hoc use you are looking for - seems like fuel efficiency isn't a big consideration. If you have NG or propane - why not just get a genset that runs on it? It will be less efficient then gas or diesel - but you won't have any long-term fuel-going-bad issues.
You can also get a PTO powered DC generator hooked to an inverter - and run it at any speed you'd like. This way, you get AC at 60 cycles at any speed or load.
I still prefer using a PTO AC generator when needed. I have several diesel tractors - and this way - I never have to worry about starting an engine that's sat for years. If I was shopping for another PTO generator - buying new would be the last thing I'd do. There are plenty of HD generators for sale from farms that have either gone under - or gotten larger and subsequently can't get by with a small 15-20KW generator. I come across many for under $1000. The 17KW unit I have was bought for $500.
It's all kind of moot point with my place now - since I've got solar electric and a huge stand-by battery bank.
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