What is this generator being used for-- a commercial building? It must
be huge to comsume that much fuel. If you are correct about the
consumption and want it to be able to run 40 hours, you will need 112
gallons.. The most common size tank in that range, with some to spare,
is 250 gal. All propane tanks are only filled to 80% capacity, which
would be 200. The main thing is that most propane companies will not
deliver less than 100 gallons, and the few that do, charge so much extra
per gallon that you will pay as much for 50 or 60 as you would for 100.
I think your number might be off a factor of 10.
Some rough calcs gives me about 240,000 btu/r=hr (~12lbs/hr @ ~20,000
That's about 70kw at 100% efficiency; ~15 to 20kw electric. That's a
fair sized generator.
How many btu/hr (sustained energy supply rate) a propane can supply is
a function of its size & the air temp. I couldn't find the data I was
looking for but my guess is that you'd need a least a 100 lb cylinder
to run this beast at all, even a faction of a day. For extended run
times (24hrs/day for days) you'd need 100's of gallons.
- posted on March 17, 2005, 1:11 am
At the company I used to work for, I had a 94 Chevy pickup-- full sized
1/2 ton, V6, automatic-- that ran on propane. It got 15 mpg running down
the road at 60 mph, which figures out to 4 gallons/hour. A generator
that uses 70% as much fuel as a truck at 60 mph has to be huge. It has
got me curious-- hopefully the OP will reply with more info. Larry