Not bad considering my NG is going to cost half or less than diesel. And it will be periodic use, not constant. I need to make a boatload of 3 phase 480 where only single phase exists an the loads will be highly variable. I could use a big ass rotary phase converter but based on the cost of fuel alone, I will save money just running the generator when needed. Especially true if they charge me a demand charge.
From: Eric Kuhnke Sent: Friday, December 02, 2016 7:11 PM To: af@afmug.com Subject: Re: [AFMUG] generator fuel Looking at it another way, I have calculated previously that the cost per kWh for 24x7 power from a diesel generator is in the range of $0.35 to $0.49 per kWh. That's including the purchase cost of the generator, maintenance, expected lifespan, cost of fuel, etc. If you want to see prime power examples of diesel used for islanded grid power, each town in Nunavut has its own set of diesel generators and tanks. There is no long distance transmission setup or inter-city grid. http://www.qec.nu.ca/home/ On Fri, Dec 2, 2016 at 5:57 PM, Chuck McCown <ch...@wbmfg.com> wrote: I agree, but my application is primary power, not emergency. From: Eric Kuhnke Sent: Friday, December 02, 2016 6:53 PM To: af@afmug.com Subject: Re: [AFMUG] generator fuel I don't think it's fair to directly compare diesel fuel to natural gas, because one is portable in just about any container (in a real emergency), the other is not. http://www.datacenterknowledge.com/archives/2012/10/31/peer-1-mobilizes-diesel-bucket-brigade-at-75-broad/ On Fri, Dec 2, 2016 at 5:49 PM, Chuck McCown <ch...@wbmfg.com> wrote: I am assuming a BTU of fuel will make so many Wh of energy. If perfectly efficient 1M BTU =292.3 kWh That would cost me $35 from the power utility. A gallon of diesel is abou $3.25 around here. 139000 btu. Diesel then is about $23 per 1M btu. However diesel engines are only 30% efficient so it will cost me $76 in fuel to make that 292.3 kWh If that assumption is approximately correct: I pay about $7.80 per decatherm in the winter for NG. A decatherm is 1 million btu About half that in summer. $7.80/.3= $26/293.3 kWh for NG not considering depreciation and maint of the generator. It seems to me that NG is the hands down fuel cost winner? Anyone see mistakes in this?
