|
|
re: generator cost vs grid?
11 jan 2001
wrote:
>didn't catch the original post but is the owning and repair cost of
>the actual generator figured into the cost/kwh listed below?
suppose my $929 honda 1500 watt gasoline generator lasts 5,000 hours with
a 0.6 quart oil change every 100 hours, and it makes 5,000x1.5 = 7500 kwh
which i sell back to the grid, making the meter run backwards at 10 cents
per kwh, thereby saving $750 on my electric bill while burning 5,000x0.23
= 1150 gallons of gas at $1.50/gallon and heating my house with 5000x9kw
= 45,000 kwh or 153,450k btu of heat, equivalent to burning about 1500
gallons of oil at $1.50/gallon in a furnace with 80% efficiency. then the
honda wears out, and i throw it away and buy another.
were my house oil-heated, i would save $1725 in heating and $750 in
electricity, while spending $929 + $1725 + $50 (oil changes), thus
saving $2475 while spending $2704, for a net cost of $229/7500, or
3 cents per kwh :-)
nick
|
|
