On 11/14/2011 8:31 AM, Jules Richardson wrote:
On Mon, 14 Nov 2011 03:52:03 -0800, bob haller wrote:
generators running on natural gas produce about 20% less power than on
gasoline.

AFAIK, that's a worst-case for after-market conversions with poor
airflow. Best-case is about a 4% loss, and real-world typically ends up
being somewhere between the two (but I think CNG usually reduces
efficiency more than LPG does).


I have seen a note about 20% natural gas derating on the manufacturers
specifications of generators.


I suppose most people over-spec their generators anyway, rather than
buying them to run right at their load limits, so even a loss in maximum
power as high as 20% might not be an issue in most cases.

cheers

Jules